下列能量变化表示氢气燃烧热的是

A．H2(g) + 1/2O2(g) = H2O(g)△H =" -241.8" kJ/mol

B．2H2(g) + O2(g) = 2H2O(g)△H =" -483.6" kJ/mol

C．2H2(g) + O2(g) = 2H2O(l)△H =" -571.6" kJ/mol

D．H2(g) + 1/2O2(g) = H2O(l)△H =" -285.8" kJ/mol