Chapter 6, Problem 83
Write an equation for the formation of each compound from its elements in their standard states, and find ΔH °f for each in Appendix IIB. a. NH3( g)
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Calculate ΔHrxn for the reaction: CaO(s) + CO2( g)¡CaCO3(s) Use the following reactions and given ΔH's: Ca(s) + CO2( g) + 12 O2( g)¡CaCO3(s) ΔH = -812.8 kJ 2 Ca(s) + O2( g)¡2 CaO(s) ΔH = -1269.8 kJ
Calculate ΔHrxn for the reaction: 5 C(s) + 6 H2( g)¡C5H12(l ) Use the following reactions and given ΔH's: C5H12(l ) + 8 O2( g)¡5 CO2( g) + 6 H2O( g) ΔH = -3244.8 kJ C(s) + O2( g)¡CO2( g) ΔH = -393.5 kJ 2 H2( g) + O2( g)¡2 H2O( g) ΔH = -483.5 kJ
Calculate ΔHrxn for the reaction: CH4( g) + 4 Cl2( g)¡CCl4( g) + 4 HCl( g) Use the following reactions and given ΔH's: C(s) + 2 H2( g)¡CH4( g) ΔH = -74.6 kJ C(s) + 2 Cl2( g)¡CCl4( g) ΔH = -95.7 kJ H2( g) + Cl2( g)¡2 HCl( g) ΔH = -92.3 kJ
Write an equation for the formation of each compound from its elements in their standard states, and find ΔH °rxn for each in Appendix IIB. b. MgCO3(s)
Write an equation for the formation of each compound from its elements in their standard states, and find ΔH °rxn for each in Appendix IIB. d. CH3OH(l)
Hydrazine (N2H4) is a fuel used by some spacecraft. It is normally oxidized by N2O4 according to the equation: N2H4 (l) + N2O4 (g) → 2 N2O (g) + 2 H2O (g) Calculate ΔH°rxn for this reaction using standard enthalpies of formation.