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19 Nov 2019
Given the reaction enthalpies, 2P(s) + 3 Cl_2(g) rightarrow 2 PCl_3(g) Delta H = -574 kJ 2 P(s) + 5 Cl_2(g) rightarrow 2 PCl_5 (l) PCl_3(g) + Cl_2(g) rightarrow PCl_5(l) a. -175 kJ b. -313 kJ c. -1461 kJ d. +1461 kJ e. +157 kJ What is the standard reaction enthalpy at 25 degree C for the decomposition of calcium carbonate to calcium oxide and carbon dioxide? (Delta H_f degree for CaCO_3 = -1206.9 kJ/mole: Delta H_f degree for CaO = -635.1 kJ/mole: Delta H_f degree for CO_2 = -393.5 kJ/mole) CaCO_3(s) rightarrow CaO(s) + CO_2(g) Delta H degree = ? a. 2235.5 kJ b. -965.3 c. 178.3 kJ d. +178.3 kJ e. +654.8 kJ From these heats of combustion CH_3OH_(l) + 3/2 O_2(g) rightarrow CO_2(g) + 2H_2O Delta H degree_rxn = -726.4 kJ C_(graphite) + O_2(g) rightarrow CO_2(g) Delta H degree_rxn = -393.5 kJ H_2(g) + 1/2 O_2(g) rightarrow H_2O_(l) Delta H degree_rxn = -285.8 kJ calculate the enthalpy of formation for methanol (CH_3OH) from its elements: C_(graphite) + 2 H_2(g) + 1/2 O_2(g) rightarrow CH_3OH_(l)
Given the reaction enthalpies, 2P(s) + 3 Cl_2(g) rightarrow 2 PCl_3(g) Delta H = -574 kJ 2 P(s) + 5 Cl_2(g) rightarrow 2 PCl_5 (l) PCl_3(g) + Cl_2(g) rightarrow PCl_5(l) a. -175 kJ b. -313 kJ c. -1461 kJ d. +1461 kJ e. +157 kJ What is the standard reaction enthalpy at 25 degree C for the decomposition of calcium carbonate to calcium oxide and carbon dioxide? (Delta H_f degree for CaCO_3 = -1206.9 kJ/mole: Delta H_f degree for CaO = -635.1 kJ/mole: Delta H_f degree for CO_2 = -393.5 kJ/mole) CaCO_3(s) rightarrow CaO(s) + CO_2(g) Delta H degree = ? a. 2235.5 kJ b. -965.3 c. 178.3 kJ d. +178.3 kJ e. +654.8 kJ From these heats of combustion CH_3OH_(l) + 3/2 O_2(g) rightarrow CO_2(g) + 2H_2O Delta H degree_rxn = -726.4 kJ C_(graphite) + O_2(g) rightarrow CO_2(g) Delta H degree_rxn = -393.5 kJ H_2(g) + 1/2 O_2(g) rightarrow H_2O_(l) Delta H degree_rxn = -285.8 kJ calculate the enthalpy of formation for methanol (CH_3OH) from its elements: C_(graphite) + 2 H_2(g) + 1/2 O_2(g) rightarrow CH_3OH_(l)
Collen VonLv2
7 Apr 2019