Adapted by Nelson Nuñez-Rodriguez
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By David W. Ball
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| QUESTION | ANSWER |
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1. Write the equivalences that this balanced thermochemical equation implies. PCl3(g) + Cl2(g) → PCl5(g) ΔH = −87.9 kJ |
1. 1 mol of PCl3 ⇔ 1 mol of Cl2 ⇔ 1 mol of PCl5 ⇔ −87.9 kJ |
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3. How many kilojoules are given off when 17.8 mol of CH4(g) react? CH4(g) + 2O2(g) → CO2(g) + 2H2O(ℓ) ΔH = −890.1 kJ |
3. 15,800 kJ |
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5. How many kilojoules are absorbed when 23.09 mol of C6H6(ℓ) are formed? 6C(s) + 3H2(g) → C6H6(ℓ) ΔH = 49.0 kJ |
5. 1,130 kJ |
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7. Glucose is the main fuel metabolized in animal cells: C6H12O6 + 6O2 → 6CO2 + 6H2O ΔH = −2,799 kJ How much energy is given off when 100.0 g of C6H12O6 react? |
7. 1,554 kJ |
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9. Given the thermochemical equation 2CO2(g) → 2CO(g) + O2(g) ΔH = 566 kJ how much energy is absorbed when 85.2 g of CO2 are reacted? |
9. 548 kJ |
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11. NaHCO3 decomposes when exposed to heat: 2NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(ℓ) ΔH = 91.5 kJ What mass of NaHCO3 is decomposed by 256 kJ? |
11. 470 g |
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13. For the thermochemical equation Fe2O3(s) + 3SO3(g) → Fe2(SO4)3 (s) ΔH = −570.2 kJ what mass of SO3 is needed to generate 1,566 kJ? |
13. 6.60 × 102 g |