題目列表(包括答案和解析)
已知通過(guò)乙醇制取氫氣有如下兩條路線:
a.CH3CH2OH(g)+H2O(g)→4H2(g)+2CO(g) △H= +255.6kJ·mol-1
b.CH3CH2OH(g)+1/2O2(g)→3H2(g)+2CO(g) △H= +13.8kJ·mol-1
則下列說(shuō)法不正確的是 ( )
A.降低溫度,可提高b路線中乙醇的轉(zhuǎn)化率
B.從能量消耗的角度來(lái)看,b路線制氫更加有利
C.乙醇可通過(guò)淀粉等生物質(zhì)原料發(fā)酵制得,屬于可再生資源
D.由a、b知:2H2(g)+O2(g)=2H2O(g) △H=-483.6kJ·mol-1
下面均是正丁烷與氧氣反應(yīng)的熱化學(xué)方程式(25°,101kPa):
①C4H10(g)+ O2(g)=4CO2(g)+5H2O(l) ΔH=-2878kJ/mol
②C4H10(g)+ O2(g)=4CO2(g)+5H2O(g) ΔH=-2658kJ/mol
③C4H10(g)+ O2(g)=4CO(g)+5H2O(l) ΔH=-1746kJ/mol
④C4H10(g)+ O2(g)=4CO(g)+5H2O(g) ΔH=-1526kJ/mol
由此判斷,正丁烷的燃燒熱是
A.-2878kJ/mol | B.-2658kJ/mol |
C.+1746kJ/mol | D.-1526 kJ/mo |
下面均是正丁烷與氧氣反應(yīng)的熱化學(xué)方程式(25℃,101 kPa):
①C4H10(g)+O2(g)===4CO2(g)+5H2O(l) ΔH=-2878 kJ/mol
②C4H10(g)+O2(g)===4CO2(g)+5H2O(g) ΔH=-2658 kJ/mol
③C4H10(g)+O2(g)===4CO(g)+5H2O(l) ΔH=-1746 kJ/mol
④C4H10(g)+O2(g)===4CO(g)+5H2O(g) ΔH=-1526 kJ/mol
由此判斷,正丁烷的燃燒熱是:
A.-2878 kJ/mol | B.-2658 kJ/mol |
C.-1746 kJ/mol | D.-1526 kJ/mol |
下面均是正丁烷與氧氣反應(yīng)的熱化學(xué)方程式(25℃,101 kPa):
①C4H10(g)+O2(g)===4CO2(g)+5H2O(l) ΔH=-2878 kJ/mol
②C4H10(g)+O2(g)===4CO2(g)+5H2O(g) ΔH=-2658 kJ/mol
③C4H10(g)+O2(g)===4CO(g)+5H2O(l) ΔH=-1746 kJ/mol
④C4H10(g)+O2(g)===4CO(g)+5H2O(g) ΔH=-1526 kJ/mol
由此判斷,正丁烷的燃燒熱是:
A.-2878 kJ/mol B.-2658 kJ/mol
C.-1746 kJ/mol D.-1526 kJ/mol
A.+8 Q kJ·mol-1 B.+16 Q kJ·mol-1
C.-8 Q kJ·mol-1 D.-16 Q kJ·mol-1
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