(基础题)已知反应B4C(s) + 4O2(g) = 2B2O3(s) + CO2(g)的ΔrHmƟ = -2859 kJ·mol-1;而且ΔfHmƟ(B2O3
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(基础题)已知反应B4C(s) + 4O2(g) = 2B2O3(s) + CO2(g)的ΔrHmƟ = -2859 kJ·mol-1;而且ΔfHmƟ(B2O3) = -1273 kJ·mol-1;ΔfHmƟ(CO2) = -393 kJ·mol-1。则ΔfHmƟ(B4C)为()
A.80.0 kJ·mol-1
B.-80.0 kJ·mol-1
C.1666 kJ·mol-1
D.-1666 kJ·mol-1

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- 80.0 kJ·mol - 1
