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.

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### 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.
Transcribed Image Text:### 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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