已知:H2(g)+F2(g)===2HF(g) ΔH=-270 kJ/mol,下列说法正确的是( ) A.

已知:H2(g)F2(g)===2HF(g) ΔH=-270 kJ/mol,下列说法正确的是(  )

A.氟化氢气体分解生成氢气和氟气的反应是放热反应

B1 mol H21 mol F2反应生成2 mol液态HF放出的热量小于270 kJ

C.在相同条件下,1 mol H21 mol F2的能量总和大于2 mol HF气体的能量

D.该反应中的能量变化可用如图来表示

 

答案

        C

 

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