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A£®N2(g) + 2O2(g) = 2NO2(g) ¡÷H =" +" 67.7 kJ/mol
B£®CaCO3(s) £½CaO(s) £«CO2(g) ¡÷H =" +" 1921.8 kJ/mol
C£®C6H12O6 ( s ) + 6O2 ( g ) = 6CO2 (g) + 6H2O ( l )¡÷H =" -2804" kJ/mol
D£®2CO(g)+O2 (g)=2CO2(g)¡÷H= £­566 kJ/mol
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