已知2H2(g)+O2(g) =2H2O(l) ΔH=-569.6kJ/mol,
2H2O(g)=2H2(g)+O2(g) ΔH=+482.1 kJ/mol.
现有1 g液态H2O,蒸发时吸收的热量是
A.2.43 kJ | B.4.86 kJ | C.43.8 kJ | D.87.5 kJ |
已知2H2(g)+O2(g) =2H2O(l) ΔH=-569.6kJ/mol,
2H2O(g)=2H2(g)+O2(g) ΔH=+482.1 kJ/mol.
现有1 g液态H2O,蒸发时吸收的热量是
A.2.43 kJ | B.4.86 kJ | C.43.8 kJ | D.87.5 kJ |