A compound has a percent composition of 24.74% potassium, 34.76% manganese, and 40.50% oxygen. The compound's empirical formula is KMnO₄.
What is empirical formula ?The term empirical formula is defined as a chemical compound is the simplest whole number ratio of atoms present in a compound.
Step 1:
Give:
Mass of the compound is 100 grams
24.74% = potassium
Molar mass of K = 39.10 g/mol
34.76% = manganese
Molar mass of Mn= 54.94 g/mol
40.50% = oxygen
Molar mass = 16.00 g/mol
Step 2:
Calculate moles of potassium
Moles K = mass K / molar mass K
Moles K = 24.74 grams / 39.10 g/mol
Moles K = 0.6327 moles
Step 3:
Calculate moles of Mn
Moles Mn = 34.76 grams / 54.94 g/mol
Moles Mn = 0.6327 moles
Step 4:
Calculate moles of O
Moles O = 40.50 grams / 16.00 g/mol
Moles O = 2.53
Step 5:
Calculate the mol ratio
We divide by the smallest amount of mol
K: 0.6327 / 0.6327 = 1
Mn: 0.6327/0.6327 = 1
O: 2.53 / 0.6327 = 4
Then the empirical formula is KMnO₄.
Thus, the compound's empirical formula is KMnO₄.
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explain why the lower vapor pressure for a solution containing a nonvolatile solute results in a higher boiling point and lower melting point compared to the pure solvent.
The lower vapor pressure results in a depressed freezing point. As a result, the graph shifts, and the triple point is lowered resulting in a lower melting point.
The boiling factor of a substance is the temperature at which the vapor stress of a liquid equals the stress surrounding the liquid and the liquid modifications right into a vapor. the warmth of vaporization is the energy required to convert a given amount (a mol, kg, pound, and so on.) of a substance from a liquid right into gasoline at a given pressure (frequently atmospheric stress).
The boiling point of a liquid varies consistent with the carried-out strain; the normal boiling point is the temperature at which the vapor stress is equal to the same old sea-stage atmospheric pressure (760 mm [29.92 inches] of mercury). At sea level, water boils at 100° C (212° F). The boiling factor of a natural substance is the temperature at which the substance transitions from a liquid to the gaseous phase.
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aqueous magnesium chloride is mixed with aqueous sodium phosphate.
A solid precipitate containing phosphorus develops when sodium phosphate and magnesium chloride are combined as aqueous solutions. Aqueous sodium phosphate is combined with aqueous MgCl.
Phosphorus is a relatively extensively distributed element, ranking 12th in terms of abundance in the crust of the Earth, where it contributes roughly 0.10 weight percent. One of its atoms exists for every normal silicon atom in the cosmos. Due to its great chemical reactivity, it cannot exist in a free state (except in a few meteorites). The phosphate ion is the only way that phosphorus may exist. The phosphate salts are the primary combination forms in nature. Apatites, which have the chemical formula [Ca10(PO4)6(F, Cl, or OH)2], are the main source of phosphorus among the about 550 distinct minerals that have been found to contain the element. Apatites include calcium ions, phosphate ions, and varying amounts of fluoride, chloride, or hydroxide ions.
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The complete question is:
When aqueous solutions of sodium phosphate and magnesium chloride are mixed together, a solid precipitate forms that contains phosphorus.
please help i’ll give you brainiest!!
0.613 atm is pressure of system
Explain what an ideal gas is.
The definition of an ideal gas is a gas in which the volume of the molecules and the forces between the molecules are so negligible as to have no impact on the behaviour of the gas.
The ideal gas law, also known as the perfect gas law, describes the relationship between a gas's pressure P, volume V, and temperature T in the range of low pressures and high temperatures when the gas's molecules move essentially independently of one another. The ideal gas law, also referred to as an equation of state in this context, applies to all gases:
PV = nRT
P = ?
V = 35L
R = 0.0821 L*atm/ mol*K
T = 97 degree celcius
n = 2.7 moles
P = nRT/V
P = 2.7* 97*0.082/ 35
P = 0.613 atm
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the process of physical weathering and erosion shape earth's landforms by:
A. Expanding the elevation of earths surface.
B. Decreasing the elevation of earths surface.
C. Changing the composition of earths surface.
D. Increasing rock layers near earths surface.
The process of physical weathering and erosion shape earth's landforms by decreasing the elevation of earths surface. Option B
What is physical weathering?Physical weathering, also known as mechanical weathering, is the breaking down of rocks, soils and minerals into smaller fragments due to physical processes such as freeze-thaw cycles, exfoliation, abrasion and salt crystal growth. These processes do not change the chemical composition of the material, but rather alter its physical structure and size.
This is one pf the ways that the rock can be able to break down.
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Formulate a real-life situation and solved which involves multiplication of polynomials and division of polynomials. Use the rubric provided to rate your work.
A real-life situation where multiplication and division of polynomials needs to be solved could be the following:
Tom is a carpenter and he needs to calculate the volume of a cuboid-shaped object he is constructing. The object has a length of 5x^2 + 6x - 2, a width of 3x - 2, and a height of 4x + 1. Tom needs to calculate the total volume of the object and rate his work with the rubric provided.
The volume of the object can be calculated by multiplying the length, width, and height together:
(5x^2 + 6x - 2)(3x - 2)(4x + 1)
The total volume can be simplified to 60x^3 + 4x^2 - 18x - 10. Tom can then use the rubric provided to rate his work.
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colligative properties depend only on solute concentration; the identity of the solute is not important. t/f
The statement, "colligative properties depend only on solute concentration; the identity of the solute is not important" is true.
Generally, colligative properties are defined as the properties of solutions that depend only on the total number of soluble particles ( which includes molecules or ions), and not on nature of solute particles present in the solution are known as Colligative properties.
Alternatively also colligative properties of solutions can be defined as the properties that depend upon the concentration of solute molecules or ions, but not upon the identity of the solute. Colligative properties usually includes vapor pressure lowering, boiling point elevation, freezing point depression, and osmotic pressure.
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A group of students collects data to determine whether compounds were ionic or covalent. They placed each compound in a
small bowl and stuck two open ends of a battery-powered circuit in the compound,
CO2 (s)
KCI (s)
CaO (S)
Compound
Conductive
SIO2 (s)
No
No
No
No
Based on the student's data, can they determine which substances are ionic, and which are covalent?
A No, as ionic compounds are only conductive in an aqueous (water) solution
B Yes, as all of these compounds are ionic since they are not conductive.
No, as covalent compounds are only conductive in an aqueous (water) solution
Yes, as all of these compounds are covalent since they are not conductive
Yes, as all of these compounds are covalent since they are not conductive.
Based on the information provided by the students, it is not possible to determine whether the compounds are ionic or covalent by solely examining their conductivity. The students tested the conductivity of the compounds in their solid form, but the conductivity of a compound does not necessarily indicate its type of bonding. Ionic compounds can be conductive in an aqueous solution, but not in their pure solid form, while covalent compounds are typically not conductive in either form. The fact that none of the compounds are conductive in the students' experiment does not mean that they are covalent. To determine the type of bonding in a compound, other factors such as chemical formula, crystal structure, and electronegativity difference between the elements must be considered.
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If the caffeine concentration in a particular brand of soda is 3.91 mg/oz, drinking how many cans of soda would be lethal?
Assume that 10.0 g of caffeine is a lethal dose, and there are 12 oz in a can.
Based on its caffeine concentration, the number of soda cans that would be lethal for the person drinking the soda is 131 cans of soda.
What is caffeine toxicity?Caffeine toxicity produces symptoms such as:
Headache, dizziness, anxiety, agitation, trembling, tingling in the perioral region and in the extremities, disorientation, psychosis, and seizures are all symptoms of the central nervous system (CNS).
The mass of caffeine in a drinking can of soda is 3.91 mg/oz * 12 = 46.92
The number of cans of soda that will contain 10.0 g of caffeine is calculated as follows:
10.0 g of caffeine = 10 * 1000 mg
10.0 g of caffeine = 10000 mg
The number of cans that will be lethal = 10000 / 46.92
The number of cans that will be lethal = 213 cans of soda
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extra step here! can you catch it while dropping off your recycling you are over come by the urge to weigh the tin cans you brought in. you find that the mass of cans in the box you brought had a mass of 23kg. how many moles do you have
55.845 g/mol of the mass of cans in the box we brought had a mass of 23kg. 411.74 mol moles we have.
To determine the number of moles of tin cans you have, we need to know the molar mass of the metal that the cans are made of. Tin cans are usually made of steel, which is an alloy made primarily of iron and carbon, with small amounts of other elements.
To convert the mass of the cans (23 kg) to moles, we need to use the following formula:
moles = mass / molar mass
moles = 23,000 g / 55.845 g/mol = 411.74 mol
Therefore, the number of moles of iron in the 23 kg of tin cans is approximately 411.74 mol.
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HELP ME SOMEBODY PLEASE HELP!
a stream traveling at 5cm/s slows to 0.04cm/s. Which particle size deposit first?
The particle size that deposits first in a stream that slows from 5 cm/s to 0.04 cm/s is determined by the settling velocity of the particles, which is a function of the particle size, shape, and density, and the fluid velocity. It is likely that the larger and denser particles will deposit first in the stream as it slows from 5 cm/s to 0.04 cm/s.
What is meant by settling velocity?Settling velocity is the speed at which a particle will sink to the bottom of a fluid due to gravity. Particles with a higher settling velocity will settle faster than those with a lower settling velocity.
What if the fluid velocity decreases?If the fluid velocity decreases, the relative velocity between the fluid and the particles also decreases. This can make it easier for particles to settle out of suspension and deposit at the bottom of the fluid.
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Is the name for a vertical column in the periodic table
a sample of ethane, c2h6 is found to contain 3.00 x 1022 atoms of h. how many molecules of c2h6 are present?
Total 5×10²¹ molecules of C₂H₆ are present in a sample of ethane which contain 3.00 x 10²² atoms of hydrogen.
We have a sample of ethane. Number of hydrogen atoms contain in C₂H₆ = 3.00 x 10²² atoms. Let us consider a reaction,
C₂H₆ → 2C+ 6H
From the equation, there is two carbon atoms and six hydrogen atoms. That means one molecule of ethane contains six hydrogen atoms. Six H-atoms are present in the no. of molecules of C₂H₆
= 1 molecule
3.00 x10²², H-atoms are present in the no. of molecules of C₂H₆= (3x10²²)/6 molecule
= 0.5×102²² molecule
= 5 × 10²¹ molecule
Hence, required number of molecules are 5×10²¹ molecule.
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What mass of hydrogen gas is produced from complete reaction of 2.00 g of sodium metal with excess water? The only other product of the reaction is sodium hydroxide.
According to the stoichiometry of the balanced chemical equation for formation of sodium hydroxide the mass of hydrogen gas produced from complete reaction of 2.00 g of sodium metal with excess water is 0.086 g.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
In the given chemical equation, 46 g sodium gives 2 g hydrogen , thus 2 g sodium gives 2×2/46=0.086 g.
Thus,the mass of hydrogen gas produced from complete reaction of 2.00 g of sodium metal with excess water is 0.086 g.
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HELP ASAP. Due at 11:59 pm ET.
Spectator ions are dissolved ions present in double replacement reactions which produce a precipitate that are not part of the precipitate.The spectator ions in the redox reaction are Na+ and NO₃⁻.
What are spectator ions ?A spectator ion is an ion that is present in solution both before and after a chemical reaction but does not participate in it. The net ionic equation is a chemical equation that only depicts the elements, compounds, and ions that are directly involved in the chemical reaction.
When NaCl and AgNO3 aqueous solutions are combined, four different ions move around in the water. They are the ions Na+, Cl-, Ag+, and NO3 -.
Thus, The spectator ions in the redox reaction are Na+ and NO₃⁻.
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. Afternoon rainstorms are common in the rainforest but not in the desert. What is one factor that make deserts less likely to have an afternoon rainstorm? O Low humidity O Low wind and speeds High air pressure O High temperatures
Answer:
Humidity—water vapor in the air—is near zero in most deserts. Light rains often evaporate in the dry air, never reaching the ground. When the air sinks it creates an area of high pressure. These high-pressure areas experience very dry and warm conditions resulting in a hot desert climate (eg the Sahara and Kalahari deserts). Winds blow from areas of high to low pressure, which transfers the air from where it is sinking to where it is rising.
Temperatures exhibit daily extremes because the atmosphere contains little humidity to block the Sun's rays.
yes yes
when a parcel of air expands and cools, or compresses and warms, with no interchange of heat with its outside surroundings, this situation is called a(n) process. a. coalescence b. bergeron c. evaporation d. adiabatic
When a parcel of air expands and cools, or compresses and warms, with no interchange of heat with its outside surroundings, this situation is called d. Adiabatic.
Temperature adjustments in each ascending and descending air parcels arise with none sizable warmth alternate among the encompassing surroundings and the vertically shifting parcel of air. The warming and cooling costs for a parcel of increasing or compressing air are termed adiabatic. An adiabatic technique is one in which no warmth is exchanged among an air parcel and the encompassing air. When we communicate approximately an adiabatic technique withinside the present day context we're speaking approximately a rising (or sinking) parcel of air that isn't always replacing any warmth with its surroundings.
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a 12.5 ml portion of this solution was transferred to another 100.0 ml volumetric flask. i. what is the molarity of this 12.5 ml portion? is concentration (here measured by molarity) an extensive or intensive property?
The quantity of solute molecules present in a given number of litres of solution, or moles per litre, is referred to as molarity, also known as molar concentration. 0.125 ml is the molarity of this 12.5 ml portion.
given,
12.5ml/100.0ml=0.125 ml
Molarity (M), which displays the number of moles of solute per litre of solution (moles/Litre), is one of the most often used units to measure the concentration of a solution. The term "molarity" is a unit of measurement that may be used to estimate a solvent's volume or quantity of a solute.
The connection between two solutions having the same number of moles of solute may be expressed by the formula C₁V₁= C₂V₂, where c is concentration and V is volume.
Components that dissolve in a solvent to create a solution are known as solutes. Liquid, gaseous, and solid states are the three possible states for a solute. A solution's solute content is typically lower than its solvent content.
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what is the entropy change of the reaction below at 298k and 1 atm pressure? n2(g) 3h2(g) ----> 2nh3(g) s(j/mol x k) 191.5 130.6 192.3
The entropy change of the reaction at 298K and 1 atm pressure is -198.7 J/K. This is calculated by subtracting the entropy of the reactants (191.5 + 130.6 = 322.1 J/K) from the entropy of the products (192.3 J/K), resulting in a change in entropy of -198.7 J/K.
The entropy change of a reaction is an important thermodynamic property that can be used to determine the spontaneity of a process. Entropy is a measure of the disorder or randomness of a system, and a reaction's entropy change is the difference between the entropy of the reactants and the entropy of the products. Generally, an exothermic reaction (in which more energy is released than is required for activation) will have a negative entropy change, indicating a decrease in disorder.
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How many kilograms are there in 2.0 x 10-15 grams? In dimensional analysis
Answer:
2.0 x 10^-21 kilograms
Explanation:
Dimensional analysis is a technique for converting between different measuring units. The procedure is identifying the measurement units involved, figuring out the conversion factor between them, and then utilising the conversion factor to compute the desired outcome.
We need to translate 2.0 x 10-15 grams to kilograms in this instance. One kilograms is equivalent to 106 grams. In order to find the kilograms. We can divide the amount of grams by 106:
2.0 x 10-15 grams per 106 is 2.0 x 10-15 kilograms per 106 grams, or 2.0 x 10-21 kilograms.
Consequently, 2.0 x 10-15 grams are equal to 2.0 x 10-21 kilos.
the rutherford experiment, in which a thin gold foil was bombarded with alpha particles (helium nuclei) showed that:
The Rutherford Experiment showed that the bulk of atom was concentrated in a tiny nucleus.
The Rutherford Experiment was an experiment conducted by Ernest Rutherford in 1909, in which he bombarded a thin sheet of gold foil with alpha particles ( helium nuclei).
The experiment showed that the bulk of the atom was concentrated in a tiny nucleus, which was composed of positively charged particles, while the vast majority of the atom was empty space. This was contrary to the then prevailing belief that the atoms were solid and homogeneous.
The experiment also showed that the nuclear charge was constant, something that was later confirmed by other experiments.
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The correct question is-
What showed the Rutherford experiment ?
How many moles of copper are in 8 x 10^24 atoms of copper?
13.2 moles of copper are in 8 x 10^24 atoms of copper.
What does Avogadro's number mean?
We may determine the number of particles in 1 mole (or mol) of a substance using Avogadro's number. These particles can be atoms, molecules, or electrons. Avogadro's number is equivalent to around 6.022140857*10^23 mol1. Depending on the substance and the nature of the reaction, the units could be electrons, atoms, ions, or molecules.
The ratio of a substance's given mass in a chemical reaction to the mass of one mole of that material is the number of moles of that substance. A mole of any substance is equal to 6.023 *10^23, or Avogadro's number. Additionally, it is employed to express concentration measurements like mole per litre and molecular weight.
No of moles of copper will be 8*10^24 / 6.023*10^23
i.e. 13.2 moles of copper
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some metals are used in surgical implants. go to the asm handbook to find the tensile strength and yield strength of 316 stainless steel (annealed or cold worked). provide the answer and citation.
I don’t have the ASM Handbook. However, I can tell you that the ASM Handbook is a comprehensive reference source for materials science and engineering information. The tensile strength and yield strength of 316 stainless steel (annealed or cold worked) can be found in Volume 2, Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, under the section on stainless steels.
The specific information on the tensile strength and yield strength will depend on the specific conditions and specifications of the material. The citation for the information can be found in the ASM Handbook.
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if a 0.50 m solution of k2so4 is slowly poured into a beaker containing 0.25 m barium nitrate and 0.30 m lead (ii) nitrate at 25o c, what will be the first precipitate that forms? ksp for barium sulfate is 1.1 x 10-10 and ksp for lead (ii) sulfate is 1.6 x 10-8 .
Barium sulfate is firstly precipitate because Ksp is less than Ksp of lead sulfate.
The solubility product (Ksp) is a constant obtained from the product of the concentrations of poorly soluble ions raised to the power of the ionization equilibrium reaction coefficient.
Ksp for barium sulfate = 1.1 x 10⁻¹⁰
Ksp for lead (ii) sulfate = 1.6 x 10⁻⁸
Reaction takes:
BaSO₄ → Ba²⁺ + SO₄²⁻
[SO₄²⁻] = Ksp/[BaSO₄]
[SO₄²⁻] = 1.1 x 10⁻¹⁰/0.30
[SO₄²⁻] = 3.7 x 10⁻¹⁰
Now
PbSO₄ → Pb²⁺ + SO₄²⁻
[SO₄²⁻] = Ksp/[Pb²⁺]
[SO₄²⁻] = 1.6 x 10⁻⁸/0.25
[SO₄²⁻] = 6.4 x 10⁻⁸
So according to the above calculation, we may Calculation: BaSO₄ will be the first precipitate that forms, and [SO₄²⁻] will reach 3.7 x 10⁻¹⁰ M before it reaches 6.4 x 10⁻⁸ M.
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What type of reaction takes place between methane and chlorine
Answer:
Substitution reaction
Explanation:
Methane (CH4) on reaction with Chlorine (Cl2) undergoes substitution reaction.
CH4+Cl2 -----------> CH3Cl+HCl is the reaction
An energy bill indicates that the customer used 1373 kWh in July. 1kWh=3. 60×106J.
How many joules did the customer use?
The customer used 4,932,190,000 joules in July. This can be calculated by multiplying 1kWh (3.60 x 10^6 J) by the number of kWh used (1373 kWh), which equals 4,932,190,000 J.
The amount of energy that is consumed is determined by the amount of electricity used. 1 kilowatt hour (kWh) is equal to 3.6 megajoules (MJ) of energy. This means that for every kWh consumed, 3.6 MJ of energy is used. This energy can be used to power a variety of appliances and devices, from lights to air conditioners and more. The amount of energy that is consumed is also affected by the efficiency of the appliances and devices being used.
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what force is caused at transform boundaries
give 10 ways on how to conserve energy
Answer:
Explanation:
Use energy-efficient appliances and light bulbs.
Unplug electronics when they're not in use.
Set your thermostat to a lower temperature in the winter and a higher temperature in the summer.
Seal air leaks around windows and doors.
Use a programmable thermostat to automatically adjust the temperature.
Wash clothes in cold water.
Use a clothesline or drying rack instead of a clothes dryer.
Turn off lights when leaving a room.
Plant trees or install shading devices to block the sun's heat.
Drive less and carpool or use public transportation more.
suppose two -l tanks are to be filled separately with the gases helium and hydrogen. what mass of each gas is needed to produce a pressure of atm in its respective tank at ?
The mass of each gas is needed to produce the pressure of 135 atm in the respective tank at 24 °C is mass of helium = 4426.92 g and the mass of hydrogen gas = 2213.46 g
The Pressure = 135 atm
The Temperature = 24 °C = 297.15 K
The Volume = 200 L
The Number of moles = ?
The ideal gas equation is expressed as:
PV = nRT
where,
P is the pressure
V is the volume
n is the number of moles
T is the temperature
R is Gas constant having value = 0.082 L.atm/K.mol
135 atm × 200 L = n × 0.082 L.atm/K.mol × 297.15 K
n = 1106.73 moles
The molar mass of helium gas = 4 g/mol
The molar mass of hydrogen gas = 2 g/mol
The mass of hydrogen = moles × molar mass
= 1106.73 × 2
= 2213.46 g
The mass of helium = moles × molar mass
= 1106.73 × 4
= 4426.92 g
This question is incomplete, the complete question is :
Suppose two 200.0-L tanks are to be filled separately with the gases helium and hydrogen. What mass of each gas is needed to produce a pressure of 135 atm in its respective tank at 24 °C?
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11. What state is this substance in at 100 degrees, and how do you know?
The boiling point is the temperature at which liquids begin to boil.The temperature stays constant as the liquid begins to boil until all of the liquid has been transformed into a gas.Water typically boils at a temperature of 100oC.
What does the substance look like at 100 C? The boiling point is that temperature.Once the liquid begins to boil, the temperature doesn't change until all of the liquid has been transformed into a gas.Water normally reaches its boiling point at 100oC.If the melting and boiling points of an object are known, its state at a particular temperature can be predicted.How to solve this is outlined in the table.The temperature at which oxygen melts and boils is both -218°C.VAPORIZATION .Water molecules become dissociated from the forces holding them together in the liquid state when it reaches its boiling point of 100oC.As a result, the liquid turns into a gas and is vaporized.To learn more about boiling point refer
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why is freezing-point depression not the preferred method for determining the molar mass of water-soluble solutions?
Freezing-point depression is not the preferred method for determining the molar mass of water-soluble solutions because it is not always reliable when dealing with complex compounds.
This is because the freezing point of a solution is affected not only by the molar mass of the solute, but also by its solubility and other factors such as the presence of impurities.
Therefore, other methods such as vapor pressure or osmometry are better suited for determining the molar mass of water-soluble solutions, as these methods are more reliable and accurate.
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