摘要：4． 已知下列各反应的焓变: Ca + 3/2 O2(g) = CaCO3 (s) △H = - 1206.8 kJ/mol Ca(s) + 1/2 O2 △H = - 635.1 kJ/mol C + O2(g) = CO2 (g) △H = - 393.5 kJ/mol 则CaCO3 + CO2(g) 的焓变△H为 A．178.2 kJ/mol B．-178.2 kJ/mol C．965.3 kJ/mol D． -965.3 kJ/mol
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已知下列各反应的焓变： Ca(s)＋C(s，石墨)＋3/2O2(g)＝CaCO3(s) ΔH＝－1206.8 kJ/mol Ca(s)＋1/2O2(g)＝CaO(s) ΔH＝－635.1 kJ/mol C(s，石墨)＋O2(g)＝CO2(g) ΔH＝－393.5 kJ/mol 则CaCO3(s)＝CaO(s)＋CO2(g)的焓变ΔH为 | |
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A． |
178.2 kJ/mol |
B． |
－178.2 kJ/mol |
C． |
965.3 kJ/mol |
D． |
－965.3 kJ/mol |