Part A For NH3( g ) write a balanced thermochemical equation. Express your answe

Question

Part A

For NH3(g) write a balanced thermochemical equation.

Express your answer as a chemical equation. Identify all of the phases in your answer.

12N2(g)+32H2(g)NH3(g)

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Correct

Part B

For NH3(g) find the value of Hf.

Express your answer using four significant figures.

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Part C

For SO2(g) write a balanced thermochemical equation.

Express your answer as a chemical equation. Identify all of the phases in your answer.

S(s)+O2(g)SO2(g)

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Correct

Part D

For SO2(g) find the value of Hf.

Express your answer using four significant figures.

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Part E

For RbClO3(s) write a balanced thermochemical equation.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Rb(s)+12Cl2(g)+32O2(g)RbClO3(s)

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Correct

Part F

For RbClO3(s) find the value of Hf.

Express your answer using four significant figures.

12N2(g)+32H2(g)NH3(g)

Explanation / Answer

B)

For NH3(g) find the value of Hf.

HF --> enthalpy of formation, must be formed by element sof compound --> N and H

STP conditions for N,H:

N2(g) and H2(g)

balance:

N2(g) + 3H2(g) --> 2NH3(g)

this must be basis 1 mol of product, so

1/2N2(g) + 3/2H2(g) --> NH3(g)

For SO2(g) find the value of Hf.

similarly,

elements = S, O2

standard state:

S8(s,rhombic) + O2(g) --> SO2(g)

balance

1/8 S8(s,rhombic) + O2(g) --> SO2(g)

C)

For RbClO3(s) find the value of Hf.

Elements -> Rb, Cl, O

standard states

Rb(s) ; Cl2(g) and O2(g)

balance

Rb(s) + 3/2Cl2(g) + 3/2O2(g) --> RbClO3(s)

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