6. Given 2CuO (s) → 2Cu (s) + O₂ (g) AH = 314.6 kJ a. Determine the heat of formation of CuO (s). b. Calculate AH for the formation of 13.58 g of CuO.

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# Thermochemical Reactions and Calculations

## Problem 5: Strontium Metal Reaction

### Description:
Strontium metal combines with graphite (C) and oxygen gas to produce strontium carbonate. The formation of one mole of SrCO₃ releases 1.220 x 10³ kJ of heat.

### Questions:
a. Write a balanced thermochemical equation for the reaction resulting in one mole of SrCO₃.
b. What is ΔH when 10.0 g of strontium reacts with excess graphite and oxygen?
c. What mass of SrCO₃ forms when 2355 kJ of heat are also formed?

## Problem 6: Decomposition of Copper Oxide

### Given Reaction:
\[ 2CuO(s) \rightarrow 2Cu(s) + O₂(g) \]

### Enthalpy:
\[ \Delta H = 314.6 \, \text{kJ} \]

### Questions:
a. Determine the heat of formation of CuO(s).
b. Calculate ΔH for the formation of 13.58 g of CuO.

## Problem 7: Decomposition of Limestone (CaCO₃)

### Description:
Limestone (CaCO₃) decomposes when subjected to a temperature of 900⁰C in a kiln, resulting in solid calcium oxide and carbon dioxide gas.

### Questions:
a. Write a balanced chemical equation for this reaction.
b. Determine ΔH for the reaction using the handout of standard heats of formation.
c. How much heat is evolved or absorbed when one gram of limestone decomposes at 900⁰C?

#### Calculations:
- For 1 g CaCO₃: 
  \[ \Delta H = \frac{131597}{100.09}\, \text{J/g} = 1315.97 \, \text{J} \]

## Problem 8: Energy Change for Steam Conversion

### Description:
Calculate the energy change for steam condensation and heating/cooling.

### Questions:
1. How much energy is released when 52.3 g of steam at 136.5⁰C cools and condenses to form water at 93.2⁰C?
    \[ = 123.52 \, \text{kJ} \]

2. How much energy is needed to heat a 42.3 g sample of ice at -35.7
Transcribed Image Text:# Thermochemical Reactions and Calculations ## Problem 5: Strontium Metal Reaction ### Description: Strontium metal combines with graphite (C) and oxygen gas to produce strontium carbonate. The formation of one mole of SrCO₃ releases 1.220 x 10³ kJ of heat. ### Questions: a. Write a balanced thermochemical equation for the reaction resulting in one mole of SrCO₃. b. What is ΔH when 10.0 g of strontium reacts with excess graphite and oxygen? c. What mass of SrCO₃ forms when 2355 kJ of heat are also formed? ## Problem 6: Decomposition of Copper Oxide ### Given Reaction: \[ 2CuO(s) \rightarrow 2Cu(s) + O₂(g) \] ### Enthalpy: \[ \Delta H = 314.6 \, \text{kJ} \] ### Questions: a. Determine the heat of formation of CuO(s). b. Calculate ΔH for the formation of 13.58 g of CuO. ## Problem 7: Decomposition of Limestone (CaCO₃) ### Description: Limestone (CaCO₃) decomposes when subjected to a temperature of 900⁰C in a kiln, resulting in solid calcium oxide and carbon dioxide gas. ### Questions: a. Write a balanced chemical equation for this reaction. b. Determine ΔH for the reaction using the handout of standard heats of formation. c. How much heat is evolved or absorbed when one gram of limestone decomposes at 900⁰C? #### Calculations: - For 1 g CaCO₃: \[ \Delta H = \frac{131597}{100.09}\, \text{J/g} = 1315.97 \, \text{J} \] ## Problem 8: Energy Change for Steam Conversion ### Description: Calculate the energy change for steam condensation and heating/cooling. ### Questions: 1. How much energy is released when 52.3 g of steam at 136.5⁰C cools and condenses to form water at 93.2⁰C? \[ = 123.52 \, \text{kJ} \] 2. How much energy is needed to heat a 42.3 g sample of ice at -35.7
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