題目列表(包括答案和解析)
①H2(g)+O2(g)H2O(g) ΔH=-241.8 kJ·mol-1
②2H2(g)+O2(g)2H2O(g) ΔH=-483.6 kJ·mol-1
③H2(g)+ O2(g)H2O(l) ΔH=-285.8 kJ·mol-1
④2H2(g)+O2(g)2H2O(l) ΔH=-571.6 kJ·mol-1
則氫氣的燃燒熱為( )
A.241.8 kJ·mol-1 B.483.6 kJ·mol-1 C.285.8 kJ·mol-1 D.571.6 kJ·mol-1
已知熱化學(xué)方程式:
① C2H2(g) +O2(g) == 2CO2(g)+H2O(l) ΔH1=-1301.0 kJ?mol-1
② C(s)+ O2(g) == CO2(g) △H2=-393.5 kJ?mol-1
③ H2(g)+ O2(g) == H2O(1) △H3 =" -285.8" kJ·mol-1
則反應(yīng)④ 2C(s)+ H2(g) == C2H2(g)的△H為( )
A.+228.2 kJ·mol-1 | B.-228.2 kJ·mol-1 |
C.+1301.0 kJ·mol-1 | D.+621.7 kJ·mol-1 |
A.+228.2 kJ·mol-1 | B.-228.2 kJ·mol-1 |
C.+1301.0 kJ·mol-1 | D.+621.7 kJ·mol-1 |
A.+228.2 kJ·mol-1 | B.-228.2 kJ·mol-1 |
C.+1301.0 kJ·mol-1 | D.+621.7 kJ·mol-1 |
已知熱化學(xué)方程式:
① C2H2(g) +O2(g) ="=" 2CO2(g)+H2O(l) ΔH1=-1301.0 kJ?mol-1
② C(s)+ O2(g) ="=" CO2(g) △H2=-393.5 kJ?mol-1
③ H2(g)+ O2(g) ="=" H2O(1) △H3 =" -285.8" kJ·mol-1
則反應(yīng)④ 2C(s)+ H2(g) ="=" C2H2(g)的△H為
A.+228.2 kJ·mol-1 | B.-228.2 kJ·mol-1 |
C.+1301.0 kJ·mol-1 | D.+621.7 kJ·mol-1 |
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