Answer : The volume of solution is 0.884 L
Explanation :
Molarity : It is defined as the number of moles of solute present in one litre of solution.
Formula used :
[tex]Molarity=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution}}[/tex]
Solute is, [tex]KNO_3[/tex]
Given:
Molarity = 0.750 M
Molar mass of [tex]KNO_3[/tex] = 101 g/mole
Mass of [tex]KNO_3[/tex] = 67.0 g
Now put all the given values in the above formula, we get:
[tex]0.750M=\frac{67.0g}{101g/mole\times \text{Volume of solution}}[/tex]
[tex]\text{Volume of solution}=0.884L[/tex]
Therefore, the volume of solution is 0.884 L
In a saturated solution that is in contact with solid Mg(OH)2, the concentration of Mg2 is 1.31 X 10-4M. What is the solubility product for Mg(OH)2
Answer:
Ksp = 8.99x10⁻¹²
Explanation:
The solubility of Mg(OH)₂ is described with the reaction:
Mg(OH)₂(s) → Mg²⁺(aq) + 2OH⁻(aq)
The solubility product, Ksp, is:
Ksp = [Mg²⁺] [OH⁻]²
As you can see from the reaction, when 1 mole of Mg²⁺ is produced, 2 moles of OH⁻ are produced too, if [Mg²⁺] is 1.31x10⁻⁴M, [OH⁻] = 2.62x10⁻⁴M
Replacing:
Ksp = [Mg²⁺] [OH⁻]²
Ksp = [1.31x10⁻⁴M] [2.62x10⁻⁴M]²
Ksp = 8.99x10⁻¹²The solubility product of the [tex]\rm Mg(OH)_2[/tex] has been [tex]\rm 8.99\;\times\;10^{-12}[/tex].
The balanced equation for the dissociation of Magnesium hydroxide has been:
[tex]\rm Mg(OH)_2\;\rightarrow\;Mg^2^+\;+\;2\;OH^-[/tex]
From the balanced chemical equation, dissociation of 1 mole magnesium hydroxide has been resulted in the 1 mole magnesium and 2 mole hydroxide ions.
Since, given magnesium concentration, [tex]\rm Mg^2^+=1.31\;\times\;10^-^4\;M[/tex]
The concentration of hydroxide ion, [tex]\rm OH^-[/tex] will be:
[tex]\rm 1\;M\;Mg^2^+=2\;M\;OH^-\\1.31\;\times\;10^-^4\;M=1.31\;\times\;10^-^4\;\times\;2\;M\;OH^-\\1.31\;\times\;10^-^4\;M=2.62\;\times\;2\;M\;OH^-\\[/tex]
The solubility product (ksp) of the reaction has been given as:
[tex]ksp=\rm [Mg^2^+]\;[OH^-]^2[/tex]
Substituting the values for ksp:
[tex]ksp\;=\rm [1.31\;\times\;10^-^4]\;[2.62\;\times\;10^-^4]^2\\\textit ksp=8.99\;\times\;10^-^1^2[/tex]
The solubility product of the reaction has been [tex]\rm 8.99\;\times\;10^{-12}[/tex].
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40.00 grams of NaOH is added into distilled water and diluted with water to 1000mL of final volume. What is the final concentration of the NaOH
Answer:
The molar mass of NaOH is 40.00 g/mol.
The number of moles of NaOH is equal to the ratio of its mass to molar mass.
The number of moles of NaOH =
40 g/mol
40 g
=1,000 mol
The molarity of NaOH solution is the ratio of number of moles of NaOH to total volume of solution in L.
M=
1 L
1 mol
=1 M
Explanation ;)
The salt copper(II) sulfate dissolves in water according to the reaction: CuSO4(s) Cu2+(aq) + SO42-(aq) (a) Calculate the standard enthalpy change ΔH° for this reaction, using the following data: CuSO4(s) = -771.4 kJ mol-1 Cu2+(aq) = 64.8 kJ mol-1 SO42-(aq) = -909.3 kJ mol-1 kJ (b) Calculate the temperature reached by the solution formed when 13.0 g of CuSO4 is dissolved in 0.109 L of water at 25.0 °C. Approximate the heat capacity of the solution by the heat capacity of 109 g of pure water (specific heat capacity = 4.18 J g-1 °C-1), ignoring the mass of the salt. °C (c) Heats of reaction find practical application in hot packs or cold packs. Would this dissolution reaction be appropriate for the preparation of a hot pack or a cold pack?
Answer:
(a) [tex]\Delta H=-73.1\frac{kJ}{mol}[/tex]
(b) [tex]T_2=38.1\°C[/tex]
(c) Yes, it is appropriated.
Explanation:
Hello.
(a) In this case, given the formation enthalpies for copper (II) sulfate, copper (II) ion and sulfate ion, we can compute the enthalpy change for such process as follows:
[tex]\Delta H=\Delta H_{Cu^{2+}}+\Delta H_{SO_4^{-2}}-\Delta H_{CuSO_4}\\\\\Delta H=64.8-909.3-(-771.4)\\\\\Delta H=-73.1\frac{kJ}{mol}[/tex]
(b) In this case, since 13.0 g of copper (II) sulfate (molar mass: 159.55 g/mol) we can compute the gained heat by water via:
[tex]Q_{water}=-n_{CuSO_4}\Delta H=-13.0g*\frac{1mol}{159.55g}* -73.1\frac{kJ}{mol}\\ \\Q_{water}=5.96kJ=5960J[/tex]
As the heat lost by the reaction is gained by the water, therefore, the final temperature is:
[tex]Q_{water}=m_{water}Cp_{water}(T_2-T_1)\\\\T_2=T_1+\frac{Q_{water}}{m_{water}Cp_{water}}\\ \\T_2=25.0\°C+\frac{5960J}{0.109L*\frac{1000g}{1L}*4.18\frac{J}{g\°C} } \\\\T_2=38.1\°C[/tex]
(c) In this case, since this dissolution reaction is exothermic as it increases the temperature when undergone, we can infer that yes, this dissolution would be appropriate for the preparation of a hot pack, because a cold pack would be with an endothermic dissolution reaction.
Best regards.
Describe what type of electron transfer happens between these two atoms.
Answer:
Magnesium loses it's two electrons and Oxygen gains two electrons. Magnesium is now a cation and Oxygen is now an anion. Both become stable.
Explanation:
The type of electron transfer which happens between the Mg and O atom is a complete transfer of electrons from the Mg atom to the O atom in an ionic bond.
As we know, Ionic bonding is a type of chemical bonding characterized by the complete transfer of electrons from one atom to the other.The most electropositive electron usually is usually the donor while the most electronegative elements is the acceptor.
As evident in the case above;
Mg, which is the electropositive element with 2 Valence electrons loses its Valence electrons to become Mg²+.O, which is the electronegative element with 6 Valence electrons, and consequently, only needs 2 electrons to complete it's octet.Ultimately, an ionic bond is formed between the Mg and O atoms.
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Which is the correct name for P205?
O phosphorus dioxide
O phosphorus pentoxide
diphosphorus pentoxidev
diphosphorus hexaoxide
Answer:
Diphosphorus Pentaoxide
Explanation:
We have 2 atoms of Phosphorus and 5 atoms of Oxygen. It is a covalent bond.
2 is Di
5 is penta
Diphosphorus Pentaoxide
Answer:
C. Diphosphorus Pentaoxide
Explanation:
I need someone to help with the bonus.
Answer:
268.3 m/sec
Explanation:
Problem PageQuestion Methanol and oxygen react to form carbon dioxide and water, like this: (l)(g)(g)(g) At a certain temperature, a chemist finds that a reaction vessel containing a mixture of methanol, oxygen, carbon dioxide, and water at equilibrium has the following composition: compoundamount Calculate the value of the equilibrium constant for this reaction. Round your answer to significant digits. Clears your work. Undoes your last action. Provides information about entering answers.
Answer:
[tex]Kc=3.8x10^{-7}[/tex]
Explanation:
Hello.
In this case, for the chemical reaction:
[tex]2CH_3OH(l)+3O_2(g)\rightarrow 2CO_2(g)+4H_2O(g)[/tex]
We write the equilibrium expression including the gaseous or aqueous species only, that is why the methanol is not included due to heterogeneous equilibrium:
[tex]Kc=\frac{[CO_2]^2[H_2O]^4}{[O_2]^3}[/tex]
Whereas each gaseous species is powered to its stoichiometric coefficient (number before the species). In such a way, considering the equilibrium masses of carbon dioxide (44 g/mol), water (18 g/mol) and oxygen (32 g/mol) to be 1.56 g, 2.28 g and 3.33 g respectively, we compute the moles as we need molar concentrations in the equilibrium constant calculation:
[tex]n_{CO_2}=1.56g/(44g/mol)=0.0355mol\\\\n_{H_2O}=2.28g/(18g/mol)=0.127mol\\\\n_{O_2}=3.33 g/(32g/mol)=0.104mol[/tex]
Thus, into the 9.3.L vessel, the equilibrium concentrations are:
[tex][CO_2]=\frac{0.0355mol}{9.3L}=0.00382M[/tex]
[tex][H_2O]=\frac{0.127mol}{9.3L}=0.0137M[/tex]
[tex][O_2]=\frac{0.104mol}{9.3L}=0.0112M[/tex]
Therefore, the equilibrium constant shown with two significant figures is:
[tex]Kc=\frac{(0.00382M)^2(0.0138M)^4}{(0.0112M)^3} \\\\Kc=3.8x10^{-7}[/tex]
Best regards.
An aerosol can contains gas under a pressure of 2.0 atm at 20°C. Directions on
the can say that the can should be kept at less than 65°C. What would the
pressure in the can be at 65 °C?
Answer:
Explanation:
The volume is the same in both cases so the formula is
P1/T1 = P2/T2
T1 = 20 + 273 = 293 You have to convert Celcius to degrees Kelvin.
T2 = 65 + 273 = 338 degrees Kelvin
P1 = 2.0 atmospheres.
2.0 / 293 = P2/ 338
2*338 / 293 = P2
P2 = 676 / 293
P2 = 2.31 atmospheres
Complete and balance each of the following equations for acid-base reactions.
HC2H3O2(aq)+NaOH(aq)→
Answer:
HC2H3O2 + NaOH = H2O + NaC2H3O2 - Chemical Equation Balancer.
Answer:
please check the image :)
In a chemical reaction, what happens to the total number of each type of atom?
Answer:
In a chemical reaction the total mass of all the substances taking part in the reaction remains the same. Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction.
Stoichiometry must be multiplied by the number that is printed on the element's foot in order to determine how many atoms of a certain element there are in a given molecule. Therefore, the quantity of atoms inside a reaction doesn't change.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms have a central nucleus and electrons that move in a fixed orbit around it. Protons and neutrons are found in the nucleus. Electron has -1 charge while proton has +1 charge.
The combined mass of all of the components involved in a chemical process stays constant. Additionally, the quantity of atoms inside a reaction doesn't change. Chemical reactions cannot produce or destroy mass.
Therefore, the quantity of atoms inside a reaction doesn't change.
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True or False – When earthquakes occur, they form huge gaps in the earth’s surface.
Answer:
i think the answer is true pls mark branliest
Explanation:
Answer:
its true! earth quakes do form huge gaps in the earth surface
Explanation:
Which of the following always combines in definite proportions?
a. compound
b. homogeneous mixture
c. element
d. heterogeneous mixture
Answer:
The answer is heterogeneous mixture
What is the current atomic model called?
Answer:
Quantum Mechanical
Explanation:
This current atomic model evolved from the earlier Rutherford-Bohr model, which compared electrons orbiting an atomic nucleus to planets orbiting the sun. The newest understanding of atomic makeup in the Electron Cloud Model better represents observed atomic phoneme since the Bohr model rose to prominence.
Answer:
Electron cloud model
Explanation:
. Give two everyday examples of the thermal energy of a substance being increased.
Answer:
• the warmth from the sun
• the heat from another a heater
• A cup of hot chocolate
•baking in an oven
Two everyday example that we say for the thermal energy of a substance being increased are, faster movement of the substances and boiling if liquids as well light absorption.
What is thermal energy?Thermal energy is a form of energy generated by heating up a substance. It can also be generated by the movement of its particles.
Vibrating molecules increases the thermal energy of a substance. Similarly, when we heat a substance it acquires more thermal energy.
Another way of increasing thermal energy is light absorption by the substance. Thermal energy associated with light increases the temperature of of the system which is absorbed the light.
Hence, the two ways by which thermal energy of a substance is increased are heating or boiling and faster movement.
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What is the molar mass of Mg(ClO4)2?
Answer:
223.21 g /mol
Explanation:
To find the molar mass (g/mol) of a substance, you have to add the amu's of all the elements together. First you have to determine how of element there are:
Mg=1, Cl=2, O=8. Now you multiply the amu of each element by the number of elements in the compound. Then add them together. The amu of an element and its molar mass are the same.
1(24.31 g/mol) + 2(35.45 g/mol) + 8(16.00 g/mol) = 223.31 g/mol
223.31 g/mol is the molar mass of the given compound. The molar mass of a material is a bulk attribute rather than a molecular one.
The ratio among the mass with the quantity of a substance (measured in mole) of any sample of a chemical compound is known as the molar mass (M) in chemistry. The compound's molar mass represents an average over numerous samples, which frequently have different masses because of isotopes. A terrestrial average as well as a function of the relative distribution of the isotopes of the component atoms on Earth, the molar mass is most frequently calculated using the standard atomic weights.
Molar mass=1(24.31 g/mol) + 2(35.45 g/mol) + 8(16.00 g/mol)
= 223.31 g/mol
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16. As he developed his periodic table, Mendeleev grouped the elements lithium,
sodium, and potassium together. What observation was likely a factor in his decision
to group these elements?
Answer:
the reactivity and the valence electrons
Explanation:
the reactivity of the elements would have played a significant role in why such elements were grouped together. the number of valence electrons dictates how reactive an element is - the less valence electrons the more reactive it is. the column, group 1 in which these elements are put together in, show that each of the elements have 1 valence electrons and are therefore reactive.
you can go on to further explain what valence electrons are, explain what the group numbers are associated with the valence electrons and how valence electrons effect reactivity. further this, talk about how the three elements have the same number of valence electrons and therefore were grouped together
What is the powerhouse of the cell?
Answer:
Mitochondria is the powerhouse of the cell, but don't let this distract you from the fact that Mr. Krabs sold SpongeBob's soul for 62 cents
Answer:
mitochondria
Explanation:
“Ozone protects us in the stratosphere but is a pollutant in the troposphere” true or false?
Answer:
true
Explanation:
Answer:
I would say the answer is FALSE because the ozone layer is the common term for the high concentration of ozone that is found in the stratosphere between 15 and 30km above the earth's surface. It covers the entire planet and protects life on earth by absorbing harmful ultraviolet-B (UV-B) radiation from the sun. So if the ozone layer is located at the stratosphere then the answer to your question is FALSE. Most atmospheric ozone is concentrated in a layer in the stratosphere, about 9 to 18 miles (15 to 30 km) above the Earth's surface (see the figure below). Ozone is a molecule that contains three oxygen atoms. At any given time, ozone molecules are constantly formed and destroyed in the stratosphere.
Hope this helps, stay safe and have a great day! :)))))
If the hydrogen atom emits red, blue-green, blue, and violet light, how many energy levels does it have in the visible region of the spectrum?
A. 3
B. 4
C. 5
D. 6
Answer:
The correct answer is - option B. 4.
Explanation:
The visible spectrum of light emitted by a sample of active or excited hydrogen atoms splits into four wavelengths that are basically four distinct levels of energy in the visible region of the spectrum. There four different wavelengths are 410 nm, 434 nm, 486 nm, and 656 nm.
These shows for colors according to the spectrum and wavelength violet, blue, green, and red, where 656 nm wavelength is most intense on the spectrum.
If a hydrogen atom emits red, blue-green, blue, and violet light, the number of energy levels it has in the visible region of the spectrum is: B. 4
An electromagnetic spectrum can be defined as a range of frequency and wavelength that an electromagnetic wave is distributed (extends).
Generally, the electromagnetic spectrum comprises the following:
Gamma rays.Visible light.Ultraviolet radiation.X-rays.Radio waves.Infrared radiation.When the atom of an element emits a radiation, each color of the radiation represents an energy level within the visible region of the electromagnetic spectrum.
Since the hydrogen atom emitted four colors (red, blue-green, blue, and violet light), it has four (4) energy levels in the visible region of the electromagnetic spectrum.
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When warm air from a large body of water
Answer:
On a warm day, water absorbs from its warmer environment, lowering the air tempurature. On a cool night, heat is transferred from the water to its cooler environment, raising the air tempura
Explanation:
Where is ionization energy highest on the periodic table?
What type of gases would be in the top right?
Ionization levels are most highest on the top right side of the Periodic Table. The type of gases that would be in the top right are noble gases, like helium, and other common noble gases.
Hope this answer helps you!
help pls 100 points and brainiest
Answer:
The amount of salt solution.
Explanation:
so first you have to think about it as a y = mx + b function, where m and x are constants. So basically the independent variable is represented by the amount of salt solution because the health of the patient is affected by the amount of salt solution. this is how you would write it out as an equation so you can understand it better.
The Health of the patient = The amount of salt solution + b
Since y depends on the values of m, x, and b, The amount of salt solution would be the independent variable.
PLEASE HELP ME
For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)? You do not need to look up any values to answer this question.
Check all that apply.
H2(g)+12O2(g)→H2O(g)
Li(s)+12F2(g)→LiF(s)
2Li(s)+F2(g)→2LiF(s)
Li(s)+12F2(l)→LiF(s)
2H2(g)+O2(g)→2H2O(g)
H2O2(g)→12O2(g)+H2O(g)
Answer:
Explanation:
Li(s)+1/2 F₂(g)→LiF(s)
In this reaction one mole of product is formed from gaseous state of reactants . So this reaction will represent the reaction for which ΔH∘rxn equals to ΔH∘f .
In other reaction one mole is not produced if we balance the reaction. The reactant must be in gaseous state . ΔH∘f . represents heat of formation . ΔH∘rxn represents heat of reaction .
) If 1 vitamin C tablet weighs 475 mg how much vitamin C is in that 1 tablet based on your
calculations?
Answer:
Amount = 0.0027 mol
Explanation:
The molecular formula of vitamin C is: C₆H₈O₆. Therefore, its molar mass will be:
Molar Mass = 6(Mass of carbon) + 8(Mass of Hydrogen) + 6 (Mass of Oxygen)
Molar Mass = 6(12 g/mol) + 8(1 g/mol) + 6(16 g/mol)
Molar Mass = 176 g/mol
Molar Mass = 176000 mg/mol
Now, for the amount of Vitamin C in 1 tablet
Amount = Mass of Tablet/Molar Mass
Amount = (475 mg)/(176000 mg/mol)
Amount = 0.0027 mol
Calculate the nuclear binding energy per nucleon for cobalt-59, the only stable isotope of cobalt. The mass of cobalt-59 is 58.933198 amu. (The mass of 11H is 1.00783 amu, and the mass of a neutron is 1.00866 amu.)
Answer:
8.54 * 10^15 J
Explanation:
For Co-59
Protons- 27
Neutrons- 32
total calculated mass of protons = 27 * 1.00783 amu = 27.211 amu
total calculated mass of neutrons = 32 * 1.00866 amu =37.320 amu
Total calculated mass of nucleons = 27.211 amu + 37.320 amu = 64.531 amu
Mass defect = 64.531 amu - 58.933198 amu = 5.5978 amu
Binding energy = E=(Δm)c^2
Δm= mass defect
c= speed of light
E= 5.5978 amu (3.0 *10^8)^2
E= 5.03 * 10^17 J
Binding energy per nucleon = Binding energy/ total number of nucleons
= 5.03 * 10^17 J/ 59 = 8.54 * 10^15 J
Which of the following items would improve the experiment? Add more types of plants Test one plant with no fertilizer Use different soils for each plant Expose all six plants to green light
Answer:
Um, I'd say add more types of plants cause different plants react differently to things, I guess?
Calculate the density of the football. Use the formula D = m/V where D is the density, m is the mass, and V is the volume. Record your calculations in Table B of your Student Guide. What is the density of the football while it is deflated? g/cm3
Answer:
0.84 g/cm3 EDGE 2020
Explanation:
Answer:
What is the density of the football while it is deflated?
⇒ 0.84 g/cm3
step of the scientific method reviews your original question and your hypothesis.
results
observation
conclusion
experiment
Answer: conclusion
Explanation:
It say reviews your original question and your hypothesis
Answer:
conclusion!
Explanation:
Problem PageQuestion Iron(III) oxide and hydrogen react to form iron and water, like this: (s)(g)(s)(g) At a certain temperature, a chemist finds that a reaction vessel containing a mixture of iron(III) oxide, hydrogen, iron, and water at equilibrium has the following composition: compound amount Calculate the value of the equilibrium constant for this reaction. Round your answer to significant digits. Clears your work. Undoes your last action. Provides information about entering answers.
Complete question
The complete question is shown on the first uploaded image
Answer:
The value is [tex]K_c = 2.69 *10^{-5} [/tex]
Explanation:
From the question we are told that
The equation is
[tex]Fe_20_3_{(s)}+3H_{(g)}\to2Fe_{(s)}+3H_2O_{(g)}[/tex]
Generally the equilibrium is mathematically represented as
[tex]K_c = \frac{[H_2O]^2}{[H_2]^3}[/tex]
Here [tex][H_2O][/tex] is the concentration of water vapor which is mathematically represented as
[tex][H_2O ] = \frac{n_w}{V_s }[/tex]
Here [tex]V_s[/tex] is the volume of the solution given as 8.9 L
[tex]n_w[/tex] is the number of moles of water vapor which is mathematically represented as
[tex]n_w = \frac{m_w}{Z_w}[/tex]
Here [tex]m_w[/tex] is the mass of water given as 2.00 g
and [tex]Z_w[/tex] is the molar mass of water with value 18 g/mol
So
[tex]n_w = \frac{2}{18}[/tex]
=> [tex]n_w = 0.11 \ mol[/tex]
So
[tex][H_2O ] = \frac{0.11}{8.9 }[/tex]
=> [tex][H_2O ] = 0.01236 \ M [/tex]
Also
[tex][H][/tex] is the concentration of hydrogen gas which is mathematically represented as
[tex][H ] = \frac{n_v}{V_s }[/tex]
Here [tex]V_s[/tex] is the volume of the solution given as 8.9 L
[tex]n_v[/tex] is the number of moles of hydrogen gas which is mathematically represented as
[tex]n_v = \frac{m_v}{Z_v}[/tex]
Here [tex]m_w[/tex] is the mass of water given as 4.77 g
and [tex]Z_v[/tex] is the molar mass of water with value 2 g/mol
So
[tex]n_w = \frac{4.77}{2}[/tex]
=> [tex]n_w = 2.385 \ mol[/tex]
So
[tex][H_2O ] = \frac{2.385}{8.9 }[/tex]
=> [tex][H_2O ] = 0.265 \ M [/tex]
So
[tex]K_c = \frac{( 0.01236 )^3}{ (0.265 )^2}[/tex]
=> [tex]K_c = 2.69 *10^{-5} [/tex]
By which method is heat transferred in a microwave oven?
Conduction
Convection
Evaporation
Radiation
Answer:
the answer is radiation.
because the microwave is a form of radiation.
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Answer: D
Explanation: