Thermochemical Equations and Stoichiometry

# Thermochemical Equations and Stoichiometry - (b What is the...

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Thermochemical Equations and Stoichiometry 1. Consider the following thermochemical equation: 2ZnS (s) + 3O 2(g) 2ZnO (s) + 2SO 2(g) Δ H ° = –878.2 kJ (a) How much heat is released when 3.0 mol ZnS (s) reacts in excess oxygen? (b) How much heat is released when 2.3 × 10 –2 mol ZnS (s) reacts in excess oxygen? (c) What is the enthalpy change when 223.9 g ZnS (s) reacts in excess oxygen? (d) What is the enthalpy change when 0.96 g ZnO (s) is produced? 2. Slaked lime (Ca(OH) 2(s) ) is produced when lime (calcium oxide, CaO (s) ) reacts with liquid water. 65.2 kJ of heat is released for each mol of Ca(OH) 2 that is produced. (a) Write a thermochemical equation for the reaction.

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Unformatted text preview: (b) What is the enthalpy change when 523.3 kg of lime reacts with excess water? 3. The following reaction represents the complete combustion of hexane, C 6 H 14( l ) , at SATP. C 6 H 14( l ) + O 2(g) → 6CO 2(g) + 7H 2 O ( l ) Δ H ° = –4163 kJ (a) If 0.537 mol of carbon dioxide is produced in the reaction represented by the equation above, how much heat is released by the reaction? (b) If 25.0 kg of hexane is burned in sufficient oxygen, how much heat will be released? (c) What mass of hexane is required to produce 1.0 × 10 5 kJ of heat by complete combustion?...
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Thermochemical Equations and Stoichiometry - (b What is the...

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