When 16.68 grams of methane (CH4) are burned (see equation below), how many moles of oxygen gas (O2) will be used? Please round your answer to two digits after the decimal point and don't forget units and substance!

CH4 + 2 O2 --> CO2 + 2 H2O

Please help me with this! thank you a bunch in advance!!

The molar mass of the compound is [tex]4.167 g/mol.[/tex]

The molar mass of the compound is calculated using the ideal gas law, which states that [tex]PV = nRT[/tex], where P is the pressure, V is the volume,R is the ideal gas constant, T is the temperature, and n is the quantity of moles of the gas.

To calculate the molar mass, we rearrange the ideal gas law to solve for n:

[tex]n =\frac{ PV}{RT}[/tex]

For the given information,[tex]P = 750 torr, V = 256 mL, R = 0.0821 L- atm/K -mol, T = 373 K.[/tex]. We can plug these values into the equation to calculate the number of moles of the gas:

[tex]n =\frac {(750 torr)(0.256 L)}{(0.0821 L-atm/K-mol)(373 K) }\\ \\= 0.192 mol[/tex]

We also know that 0.800 g of the compound is present. We can use the molar mass to calculate the number of moles of the compound:

[tex]Molar mass =\frsc{ 0.800 g }{0.192 mol}\\ \\ = 4.167 g/mol[/tex]

Therefore, the molar mass of the compound is [tex]4.167 g/mol.[/tex]

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The term mole concept is used here to determine the number of moles of N₂O. Here 8.21 x 10²³ molecules of N₂O have 1.36 moles.

One mole of a substance is defined as that quantity of it which contains as many entities as there are atoms exactly in 12 g of carbon - 12. The formula used to calculate the number of moles is:

Number of moles = Given mass / Molar mass

An equation connecting the number of molecules and number of moles of molecules can be represented as:

Number of molecules in a sample = Number of moles of molecules × Avogadro number (6.022 × 10²³)

From this equation the number of moles is:

Number of moles of molecules = Number of molecules in a sample / 6.022 × 10²³

= 8.21 x 10²³/ 6.022 × 10²³ = 1.363 moles.

Thus the number of moles in 8.21 x 10²³ molecules of N₂O is 1.363 moles.

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a 1.0 x10 - 4 m solution has a ph of 10.00. the solute is a oiuyt strong base  the concentration of the base relative to its dissociation constant

A pH of 10.00 indicates that the solution is basic with a hydroxide ion (OH-) concentration of 1 x 10-10 mol/L. To determine whether the solute is a weak or strong base, we need to consider the concentration of the base relative to its dissociation constant (Kb). If the concentration of the base is much greater than its Kb, it is considered a strong base, meaning it completely dissociates in solution. On the other hand, if the concentration of the base is much less than its Kb, it is considered a weak base, meaning it only partially dissociates in solution. In this case, with a hydroxide ion concentration of 1 x 10-10 mol/L and a low concentration of the solute, we can conclude that the solute is a strong base.

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We must first determine the number of moles of H2SO4 contained in one litre of 9.61 M H2SO4 solution in order to compute the mole fraction of H2SO4.

The formula for calculating the amount of H2SO4 in the solution is:

Moles of H2SO4 are calculated as follows: 9.61 mol/L x (1000 mL / 1 L) = 9610 mmol; molarity of H2SO4 x volume of solution in litres

Calculating the solution's mass is the next step. To accomplish this, we can use the solution's density:

moles of all components = mass of solution / molecular weight of H2SO4 = 1520 g / 98.079 g/mol = 15.50 mol moles of H2SO4 / moles of all components = 9610 mmol / (15.50 mol x 1000 mmol/mol) = 0.620 mole fraction of H2SO4 = moles of H2SO4 / moles of all components = 9610 mmol

Hence, 0.620 moles of H2SO4 make up the solution.

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The standard enthalpy of formation of NH3SO2 is -302 kJ/mol

The standard enthalpy of formation of NH3SO2 can be calculated using the standard enthalpies of formation of its constituent elements, ammonia (NH3) and sulfur dioxide (SO2), and the standard enthalpy of decomposition of NH3SO2. The standard enthalpy of formation of a compound is defined as the change in enthalpy that occurs when one mole of the compound is formed from its constituent elements in their standard states.

The standard enthalpy of formation of NH3 can be found to be -46 kJ/mol and the standard enthalpy of formation of SO2 can be found to be -296 kJ/mol. The standard enthalpy of decomposition of NH3SO2 is given as 40 kJ/mol. Using these values, the standard enthalpy of formation of NH3SO2 can be calculated as follows:

ΔHf (NH3SO2) = ΔHf (NH3) + ΔHf (SO2) - ΔHd (NH3SO2)

ΔHf (NH3SO2) = -46 kJ/mol + (-296 kJ/mol) + 40 kJ/mol

ΔHf (NH3SO2) = -302 kJ/mol

So, the standard enthalpy of formation of NH3SO2 is -302 kJ/mol. This value tells us the amount of heat energy released or absorbed when one mole of NH3SO2 is formed from its constituent elements in their standard states.

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False. C++ has a built-in data type called std::string, which is designed to store strings of data. It is a class defined within the standard C++ library, and it is a part of the C++ Standard Template Library (STL).

The Standard Template Library (STL) is a collection of data structures, algorithms, and other programming tools for use in software development. It is a library of generic programming components that can be used to implement various data structures and algorithms, such as vectors, lists, maps, and queues. The STL is written in the C++ programming language and is included in most C++ compilers. The STL consists of four components: containers, iterators, algorithms, and functions. Containers are used to store and manipulate data, iterators are used to traverse data, algorithms are used for common operations such as searching and sorting, and functions provide additional functionality. The STL is designed to be efficient, flexible, and extensible. It is also designed to be portable, meaning that the same code can be used on different types of computers. By using the STL, developers can save time and effort in creating their own custom data structures and algorithms.

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According to the question, 3.26 atm will its pressure be, asumming constant temprature.

What is temprature?

Temperature is a measure of the thermal energy of a system or object. It is one of the fundamental properties of matter and is measured with a thermometer. Temperature is a measure of the average kinetic energy of the particles of a substance. Temperature is used to measure the levels of heat, cold and other thermal states. Temperature can be measured in Kelvin, Celsius, and Fahrenheit scales. Temperature is important to understand the behavior of matter and its properties. Temperature can affect the rate of a reaction, the state of matter, and the solubility of a substance.

Using the ideal gas law, the new pressure of the gas can be calculated as follows: P2 = (1.26 atm × 7.40 L) / 2.93 L

P2 = 3.26 atm

Therefore, the pressure of the gas will be 3.26 atm when its volume is decreased to 2.93 L, assuming constant temperature.

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The solution becomes cloudy with a white solid, is the observation that indicates the chemical reaction.

A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products. Substances are either chemical elements or compounds.

A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.  Absolute confirmation of a chemical change can only be validated by chemical analysis of the products.

Therefore, the solution becomes cloudy with a white solid is the correct choice.

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--The complete question is, During an experiment, Jon exhales through a straw and blows bubbles into a solution. Which observation would most likely indicate that a chemical reaction is occurring?

a. The bubbles disappear into the solution before reaching the surface.

b. The gas forms a layer above the surface of the solution.

c. The solution becomes very stirred up by the bubbles.

d. The solution becomes cloudy with a white solid.--

Ionic compounds are formed when there is a donation of an electron from one element to another that receives the electron. This causes the donating atom to attain a positive charge and the receiving atom to attain a negative charge. The ions are held by strong electrostatic forces that hold them in a fixed state.

A feasible model for the atom proposed by Rutherford in this scenario would be the planetary model.

What is feasible model?

A feasible model is a model which takes into account the constraints of a given problem, such as time and resources, and is able to deliver a solution which meets the objectives set out in the problem. A feasible model is typically used in operations research and management science to help identify the best solution to a given problem. It is important to note that a feasible model is not necessarily the most optimal solution, but rather one which is both achievable and realistic.

According to this model, the atom consists of a central, positively charged nucleus surrounded by electrons in orbits similar to the planets around the sun. The nucleus holds most of the atom's mass, and the electrons orbit the nucleus much as planets orbit the sun. This model explains why nearly all of the alpha particles were deflected back, as the positive charge of the nucleus repelled the alpha particles.

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Answer:

i

Explanation:

The difference of freezing point of the solution is 11.5°C. The Kf value is directly proportional to the difference. The Kf value of the solvent here is 24 °C Kg/mol.

The addition of a non-volatile solute will decrease the freezing point of the solution relative to the pure solvent.

The depression in freezing point is directly proportional to the molality of the solution.

ΔTf = Kf m

Here, the proportionality constant Kf is called molal depression constant.

ΔTf  = Kf W2 1000 / M W1.

here, W1 be the mass of solvent and W2 be the mass solute.

W1 = 25 g

W2 = 0.2113

molar mass of solute M (for water here) = 18 g/mol.

ΔTf = 11.5 °C

then Kf = ΔTf M W1/1000 W2

Kf = 11.5 °C × 25 g ×18 g/mol / (1000 × 0.2113 g) = 24 °C Kg/mol

Therefore, the kf of the solvent is  24 °C Kg/mol.

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40 grams of a sodium chloride are added to 150 grams of water. The water cools by 5 degrees Celsius. Therefore, 3974.8J  is the heat of solution of the sodium chloride.

Calorimetry (from Latin calor 'heat' and Greek v (metron)'measure') is the science or act of trying to measure changes in state factors of a body to derive the temperature difference associated with changes in its state caused by chemical interactions, physical changes, as well as phase transformations under specified constraints.

A calorimeter is used to perform calorimetry. The discipline of calorimetry is considered to have been founded by Scottish physician as well as scientist Joseph Black, who became the first to establish the distinction among heat and temperature.

q = m ×c×ΔT

    = 190 ×4.184×5

    =3974.8J

Therefore, 3974.8J  is the heat of solution of the sodium chloride.

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Answer:

In order to promote biodiversity, fight disease, and advance agriculture, soil is essential in the following ways:

Biodiversity: A variety of microbes, insects, and plants that make up intricate food webs live in soil. The diversity of the soil fosters the growth of plants, which in turn provide habitat and food for other organisms, and contributes to the stability of the ecosystem.

Fighting disease: Soil microorganisms compete with pathogenic organisms for resources and space and also produce antimicrobial chemicals, which helps to avoid plant diseases. Additionally, minimising tillage and increasing organic matter are two soil management techniques that can help lower the prevalence of plant diseases.

Agriculture: Soil supports crops physically, supplies them with vital nutrients, and controls the flow of air and water. Crop yields and quality can both rise with healthy soil and a balanced soil microbiota. Furthermore, sustainable agriculture can be supported by soil management techniques like cover crops and decreased tillage that preserve soil resources and maintain soil health.

The soil is home to a wide range of bacteria, insects, or plants that support complex food webs.

The bioactive, porous media that has grown in the top layer of the Earth's crust is known as soil. Being a source of water as well as nutrients, a filter for harmful wastes, a site for their breakdown, and a collaborator in the cycle of carbon as well as other substances through the planet's ecosystem, soil constitutes one of the main substrates of life on Earth.

In the following way soil contributes to biodiversity, fighting disease and agriculture. Biodiversity: The soil is home to a wide range of bacteria, insects, or plants that support complex food webs. Disease prevention: Soil microorganisms create antimicrobial compounds and compete against pathogenic organisms for nutrients and space, which helps prevent plant diseases. Agriculture: Soil provides crops with physical support, essential nutrients, and control over air and water flow.

Therefore, the soil is home to a wide range of bacteria, insects, or plants that support complex food webs.

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Baking soda (sodium bicarbonate) can be used to neutralize a concentrated sulphuric acid spill fairly safely.

What is neutralize?

A neutralization reaction is a chemical process in which an acid and a base combine to produce salt and water as the end products. H+ ions and OH- ions combine to form water during a neutralization reaction.

Sodium bicarbonate (baking soda) can be used to safely neutralize a concentrated sulphuric acid spill, whereas caustic soda could generate a lot of heat and fumes. Although sodium bicarbonate has a lower heat of reaction, the carbon dioxide gas it produces will result in intense bubbling. Since sodium bicarbonate is not particularly dangerous, adding too much is not a cause for concern. Although crushed limestone is a great option as well, there will be more fuming due to the higher heat of the reaction. Large-scale acid neutralization at the site would necessitate the presence of personnel who are very familiar with this process. Prior to neutralization, it is advised that as much spilled material as possible be recovered.

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(a) The value of the reaction quotient before any reaction occurs is 0.10 M.

(b) The value of the equilibrium constant for the reaction is 0.38.

The reaction between NO2 and N2O4 can be written as:

2NO2(g) ⇌ N2O4(g)

The reaction quotient (Q) is defined as the ratio of the concentrations of the products raised to their stoichiometric coefficients, to the concentrations of the reactants raised to their stoichiometric coefficients.

At the beginning of the reaction, before any reaction occurs, the concentration of NO2 is 0.10 M, and there is no N2O4. Therefore, the value of Q at this point would be:

Q = (N2O4^2)/(NO2^2)

= 0

The value of the reaction quotient at equilibrium can be found from the given concentrations, [NO2] = 0.016 M and [N2O4] = 0.042 M.

Q = (0.042^2)/(0.016^2)

= 0.38

The value of the equilibrium constant (Kc) is equal to the value of the reaction quotient at equilibrium. Therefore, Kc = 0.38.

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You poured 2.5 ml into a serological pipette. 10 ml can fit within. 2.5ml will be dispensed if the number 0 is at the top near the pump.

To determine how much liquid you will dispense, you need to know how much liquid you want to remove from the pipette.

If you filled a serological pipette to the 2.5 mL mark and it can hold 10 mL, then the pipette is currently filled to 2.5/10 = 0.25 or 25% of its total volume. If you want to dispense all of the liquid in the pipette, you would dispense 2.5 mL.

If you want to dispense a smaller amount, you can use the volume markings on the pipette to measure out the desired volume. For example, if you want to dispense 1 mL, you could dispense the liquid until the volume in the pipette reads 1.0 mL.

It's important to note that when using a serological pipette, you should always dispense slowly and carefully to ensure accurate measurement and avoid splashing or introducing air bubbles into the liquid.

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A balanced equation obeys the law of conservation of mass which states that the number of reactants and products on both sides of the equation should be always equal.

An equation in which the number of atoms of each element in the chemical reaction and the total charge are found to be the same for both the reactants and products. The mass of the reactants is equal to the mass of products.

The following steps are used to balance the given equation.

Thus the balanced equation obtained is:

Mg (NO₃)₂ + 2HCl → 2HNO₃ + MgCl₂

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In order to generate the Sc3+ cation, scandium sacrifices one 3d electrons and two 4s electrons. In order to generate the Al3+ cation, aluminum loses 1 3p electron as well as two 3s electrons.

Scandium is used as an alloys constituent in elevated halide lamps and sporting authority alloys, which are the two principal applications for the metal. When mixed with aluminum plus alloys constructed on aluminum, scandium prevents grain growth at warm altitudes.

Scandium is not harmful, despite assertions to the contrary that certain of its elements may be cancerous. Scandium presents the biggest risk at work due to the possibility of fumes and damps being inhaled.

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A mole of oxygen (O₂) molecules and a mole of carbon dioxide (CO₂) molecules at the same temperature and pressure have the same number of molecules.The correct answer is D.

At the same temperature and pressure, a mole of oxygen (O₂) molecules and a mole of carbon dioxide (CO₂) molecules both contain the same number of molecules.

In honor of the Italian physicist Amedeo Avogadro, the quantity of units in a mole is also known as Avogadro's number or Avogadro's constant (1776–1856).

Equal volumes of gases under identical conditions should contain the same number of molecules, according to Avogadro's hypothesis. This idea helped establish atomic and molecular weights and gave rise to the concept of the mole.

Every material has the same amount of atoms or other particles in a mole. The mole has the following relationship to an element's mass: One mole of carbon-12 atoms weighs 12 grams and has 6.02214076 x 10²³atoms.

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The volume of the balloon if five more same-sized breaths are added to the balloon is 4L.A measurement of three-dimensional space is volume. Numerous imperial or US customary units, as well as SI-derived units, are frequently used to quantify it quantitatively.

The quantity of air a balloon can contain is measured by its volume. A balloon's volume is expressed in cubic feet or meters. A balloon can contain 14.5 cubic feet of air on average. The size of the balloon, the volume of air within, and the temperature of the air all have an impact on the volume of the balloon.

The amount of space occupied by a substance or item, or the volume of space enclosed within a container.

The volume of inflated balloon is 1.5 L

[tex]1.5 X \frac{1 breath}{3breath} =0.5[/tex]

The final volume after 8 breaths

[tex]0.5 X \frac{8 breath}{1 breath} =4 L[/tex]

Thus, the volume of the balloon after five more breaths is 4.5 L.

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Temperature, pressure, and volume are interrelated in a state of equilibrium. When temperature is held constant, an increase in pressure will result in a decrease in volume.

1.As the temperature of a gas increases, the volume it occupies at constant pressure also increases.

2.As the pressure of a gas increases, the volume it occupies at constant temperature decreases.

3.As the volume of a gas decreases at constant temperature, the pressure it exerts increases.

4.As the volume of a gas increases at constant temperature, the pressure it exerts decreases.

5.The relationship between temperature, pressure, and volume of a gas can be described by the Ideal Gas Law.

6.Changes in temperature, pressure, and volume can affect the physical and chemical properties of a gas.

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The interplanar spacing between (211) planes of lead is 0.155 nm. yes this plane diffract in an xrd experiment.

The interplanar spacing (d-spacing) between (211) planes of lead can be calculated using the following formula:

d = 2 * r / √h^2 + k^2 + l^2

where r is the atomic radius (0.175 nm), h, k, and l are the Miller indices for the particular set of lattice planes, and in this case (h, k, l) = (2, 1, 1).

Plugging in the values, we get:

d = 2 * 0.175 nm / √2^2 + 1^2 + 1^2

d = 2 * 0.175 nm / √4 + 2

d = 0.35 nm / 2.236

d = 0.155 nm

So, the interplanar spacing between (211) planes of lead is 0.155 nm.

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a. London dispersion forces- intermolecular force is exist between an CO2 molecules.

b. Dipole-dipole interaction- intermolecular force is exist between an CO molecules.

A steady change in the relative ratios of two or more substances up to the point at which they become homogenous when combined; this point is known as the limit of solubility.

Solute refers to an object that dissolves in a solution. In fluid solutions, there is a larger concentration of solvent than solute. Salt and water are two excellent examples of substances that we use on a daily basis. Since salt dissolves in water, it serves as the solute.

a. London dispersion forces- intermolecular force is exist between an CO2 molecules.

b. Dipole-dipole interaction- intermolecular force is exist between an CO molecules.

c. Hydrogen bonding- Methanol, ethanol, ammonia, and methylamine are soluble in water because they can form.

d. Ion-dipole interaction- intermolecular force is responsible for the attraction between an KCl and a water molecule.

Therefore, The principal type of solute-solvent interaction in each of the following solutions are mentioned below.

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As the temperature of a solution changes, its volume will also change, which will affect its molarity but not its molality is the best statement that explains why molality is used instead of molarity in this equation is So, the correct choice is option (d).

Molality (m) and molarity (M) both use to express the concentration of a solution. As we know, Molarity of a solution is defined as the number of moles of solute present in volume of solution. That is if 'n' and 'V' be number of moles of solute and volume of solution respectively then Molarity, M of solution is, M = n/V

Molarity ∝ 1/volume and volume ∝ temperature

so, Molarity ∝ 1/ temperature

but Molality is defined as the number of moles of solute present in mass of solvent. That is molality,

m = n/m'

so, molality ∝ 1/mass of solvent not volume

therefore, molality is independent of temprature. So, when there is change in temperature then molality will prefer instead of molarity in this equation.

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Complete question :

The equation used to calculate the change in freezing point (ΔTf) of a substance is ΔTf=Kfm

where Kf is the freezing point depression constant and m is the molality of the solution.

Which of the statements explains why molality is used instead of molarity in this equation?

A: Molality does not appear in many equations, so it is used here to distinguish this equation from other similar ones

B: The equation was originally published with m as a typo, rather than M, but the values are close enough that the equation is still valid.

C: In solutions, moles are not directly related to grams and the freezing point of a solution is dependent solely on the number of grams of solute.

D: As the temperature of a solution changes, its volume will also change, which will affect its molarity but not its molality.

Water molecules in the Earth's water cycle can be millions of years old. They can be reused over and over through evaporation, precipitation, and infiltration.

Water molecules on Earth are constantly circulating through the water cycle, which includes processes such as evaporation, precipitation, and infiltration. As water evaporates, it rises into the atmosphere and eventually falls back to the surface as precipitation. This process can repeat many times, with the same water molecules being reused over and over. In this way, water molecules can be millions of years old, as they are constantly being cycled through the water cycle and reused. For example, groundwater can be hundreds of thousands to millions of years old, and can contain water molecules that have been circulating for a long period of time. When we drink water, we may be consuming water molecules that are millions of years old, but have been purified and replenished through the water cycle.

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The equation for the response between sodium hydroxide (NaOH) and magnesium nitrate (Mg(NO3)2) is: 2 NaOH (aq) + 2 Mg(NO3)2 (aq) → 2 Mg(OH)2 (s) + 3 NaNO3 (aq).

If the adjustment of interior energy (E) of a framework is positive, it implies that the response is exothermic and heat is let out of the framework. This response is exothermic in light of the fact that the last state has a lower complete energy than the underlying state because of the development of the strong magnesium hydroxide encourage and the arrival of intensity. The extent of the adjustment of inward energy relies upon how much reactants and the circumstances under which the response happens.

The response between sodium hydroxide (NaOH) and magnesium nitrate (Mg(NO3)2) is adjusted as: 2 NaOH (aq) + 2 Mg(NO3)2 (aq) → 2 Mg(OH)2 (s) + 3 NaNO3 (aq). On the off chance that the adjustment of inward energy (E) of a framework is positive, it implies the response is exothermic and heat is delivered. This implies that the last condition of the framework has lower all out energy than the underlying state. The development of strong magnesium hydroxide hasten and the arrival of intensity add to this reduction in energy. The extent of the adjustment of energy relies upon how much reactants and response conditions.

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The complete question is:

Write the equation for the chemical reaction for Sodium Hydroxide Reacts With Magnesium Nitrate To Form Magnesium Hydroxide (MW = 58.3 G/Mol) Precipitate And Sodium Nitrate. NaOH (Aq) + Mg (NO_3)_2 (Aq) Rightarrow Mg(OH)_2 (S) + NaOH_3 (Aq) Balance The Reaction. 2 NaOH (Aq) + 2 Mg(NO_3)_2 (Aq) Rightarrow 2 Mg(OH)_2 (S) + 3 NaNO_3 (Aq) If The Change In The Internal Energy, E, Of A System Is Positive.

101 grams of potassium nitrate are produced.

One mole of a compound contains Avogadro's number (6.022 x 1023) of molecules (molecular compounds) or formula units (ionic compounds). The molar mass of a compound indicates the mass of 1 mole of this substance. In other words, it indicates the number of grams per mole of compound. The molar mass of a substance is defined as the mass of one mole of that substance expressed in grams per mole, equal to the mass of 6.022 × 10 23 atomic, molecular, or formula units of that substance. 0.557 mol of K2S, or 0.5 * 110 grams

= 55 grams of K2S

0.5 mol reacts with 1 mol LiNO3 to form 1 mol potassium nitrate

Mass = 101g

101 grams of potassium nitrate are produced.  

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