已知在1×105Pa,298K条件下,2mol氢气燃烧生成水蒸气放出484kJ热量,下
列热化学方程式正确的是
A.H2 O(g)= H2(g)+1/2O2(g) ΔH = 242 kJ/mol |
B.2H2(g)+O2(g)= 2H2O(g) ΔH = -484 kJ/mol |
C.H2(g)+1/2O2(g)= H2O(1) ΔH =-242 kJ・mol |
D.2H2(g)+O2(g)= 2H2O(g) ΔH= +484 kJ・mol-1 |
已知在1×105Pa,298K条件下,2mol氢气燃烧生成水蒸气放出484kJ热量,下
列热化学方程式正确的是
A.H2 O(g)= H2(g)+1/2O2(g) ΔH = 242 kJ/mol |
B.2H2(g)+O2(g)= 2H2O(g) ΔH = -484 kJ/mol |
C.H2(g)+1/2O2(g)= H2O(1) ΔH =-242 kJ・mol |
D.2H2(g)+O2(g)= 2H2O(g) ΔH= +484 kJ・mol-1 |