摘要:19.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.H2O(g)=H2(g)+1/2O2(g) ΔH=+242kJ·mol-1 B.2H2(g)+O2(g)=2H2O(l) ΔH=-484kJ·mol-1 C.H2(g)+1/2O2(g)=H2O(g) ΔH=+242kJ·mol-1 D.2H2(g)+O2(g)=2H2O(g) ΔH=+484kJ·mol-1
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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.H2O(g)=H2(g)+1/2 O2(g); △H= +242kJ·mol-1
B.2H2(g)+O2(g)=2H2O(l); △H= -484kJ·mol-1
C.H2(g)+1/2 O2(g)=H2O(g); △H= +242kJ·mol-1
D.2H2(g)+O2(g)=2H2O(g); △H= -242kJ·mol-1
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已知在1×105Pa、298K条件下,2 mol氢气燃烧生成水蒸气放出484 kJ热量,下列热化学方程式正确的是( )
A.H2O(g)H2(g)+O2(g) ΔH=+242 kJ·mol-1
B.2H2(g)+O2(g)2H2O(l) ΔH=-484 kJ·mol-1
C.H2(g)+12O2(g) H2O(g) ΔH=+242 kJ·mol-1
D.2H2(g)+O2(g) 2H2O(g) ΔH=+484 kJ·mol-1
查看习题详情和答案>>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. H2O(g)=2H2(g)+O2(g) △H=+242kJ/mol
B. 2H2(g)+O2(g)=2H2O(l) △H=-484kJ/mol
C. H2(g)+1/2O2(g)=2H2O(g) △H=+242kJ/mol
D. 2H2(g)+O2(g)=2H2O(g) △H=+484kJ/mol
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