Answer to Question #65825 in Physical Chemistry for umar

Question

Question 11 : Every type of chemical bond contains a certain amount of energy. The total bond energy, which is essentially equivalent to the total potential energy of the system, is a quantity known as:
entropy.
free energy.
kinetic energy.
enthalpy.

Question 12 : Which reaction is likely to have a negative change in entropy?
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NaCl(s)→Na+(aq)+Cl−(aq)

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2NH3(s)→N2(g)+3H2(g)

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CaO(s)+CO2(g)→CaCO3(s)

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N2O4(g)→2NO2(g)

Answer 1

Solution:
Question 11: The enthalpy is equal to the sum of the internal and potential energy. So the correct answer: entropy.
Question 22: ΔHr = ΔHproducts – ΔHinitial
In the reaction CaO(s)+CO2(g)→CaCO3(s) with 2 moles of the starting materials, 1 mole of products
So the correct answer: CaO(s)+CO2(g)→CaCO3(s).
Answer: Question 19: entropy;
Question 20: CaO(s)+CO2(g)→CaCO3(s).