#11 ### Calorimetry Practice#### Problem 11When potassium chloride reacts with oxygen under the right conditions, potassium chlorate is formed:\[ 2 \text{KCl} + 3 \text{O}_2 \rightarrow 2 \text{KClO}_3 \]Given that the heat of formation of potassium chloride is -436 kJ/mol and the heat of formation of potassium chlorate is -391 kJ/mol, determine the heat of reaction.#### Problem 12Calcium carbonate decomposes at high temperature to form carbon dioxide and calcium oxide:\[ \text{CaCO}_3 \rightarrow \text{CO}_2 + \text{CaO} \]Given that the heat of formation of calcium carbonate is -1207 kJ/mol, the heat of formation of carbon dioxide is -394 kJ/mol, and the heat of formation of calcium oxide is -635 kJ/mol, determine the heat of reaction.#### Problem 13Carbon tetrachloride can be formed by reacting chlorine with methane:\[ \text{CH}_4 + 2 \text{Cl}_2 \rightarrow \text{CCl}_4 + 2 \text{H}_2 \]Given that the heat of formation of methane is -75 kJ/mol and the heat of formation of carbon tetrachloride is -135 kJ/mol, determine the heat of reaction.### Answers:1) 63.5 kJ 2) 0.213 cal/g°C 3) 210 g 4) 0.0309 cal/g°C 5) 0.041 cal/g°C 6) 330 g7) 1330 kcal 8) 9.8 cal/g°C 9) +26 kJ/mol 10) 2690 kJ/mol 11) +90 kJ 12) +178 kJ 13) -60 kJPlease use this guide to practice and improve your understanding of calorimetry and energy changes in chemical reactions.

Since you are posted with multiple questions. As per the rule I am answering first question only.…

11) When potassium chloride reacts with oxygen under the right conditions, potassium chlorate is formed: 2 KCI + 3 02 - 2 KCI03 Given that the heat of formation of potassium chloride is -436 kJ/mol and the heat of formation of potassium chlorate is -391 kJ/mol, determine the heat of reaction.

11) When potassium chloride reacts with oxygen under the right conditions, potassium chlorate is formed: 2 KCI + 3 02 - 2 KCI03 Given that the heat of formation of potassium chloride is -436 kJ/mol and the heat of formation of potassium chlorate is -391 kJ/mol, determine the heat of reaction.

Chemistry

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Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

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#11

### Calorimetry Practice

#### Problem 11

When potassium chloride reacts with oxygen under the right conditions, potassium chlorate is formed:
\[ 2 \text{KCl} + 3 \text{O}_2 \rightarrow 2 \text{KClO}_3 \]

Given that the heat of formation of potassium chloride is -436 kJ/mol and the heat of formation of potassium chlorate is -391 kJ/mol, determine the heat of reaction.

#### Problem 12

Calcium carbonate decomposes at high temperature to form carbon dioxide and calcium oxide:
\[ \text{CaCO}_3 \rightarrow \text{CO}_2 + \text{CaO} \]

Given that the heat of formation of calcium carbonate is -1207 kJ/mol, the heat of formation of carbon dioxide is -394 kJ/mol, and the heat of formation of calcium oxide is -635 kJ/mol, determine the heat of reaction.

#### Problem 13

Carbon tetrachloride can be formed by reacting chlorine with methane:
\[ \text{CH}_4 + 2 \text{Cl}_2 \rightarrow \text{CCl}_4 + 2 \text{H}_2 \]

Given that the heat of formation of methane is -75 kJ/mol and the heat of formation of carbon tetrachloride is -135 kJ/mol, determine the heat of reaction.

### Answers:
1) 63.5 kJ
2) 0.213 cal/g°C
3) 210 g
4) 0.0309 cal/g°C
5) 0.041 cal/g°C
6) 330 g
7) 1330 kcal
8) 9.8 cal/g°C
9) +26 kJ/mol
10) 2690 kJ/mol
11) +90 kJ
12) +178 kJ
13) -60 kJ

Please use this guide to practice and improve your understanding of calorimetry and energy changes in chemical reactions.

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