C4H10(g)+O2(g)==4CO2(g)+5H2O(1),△H=-2900kJ/mol.有一質(zhì)量為0.80kg.容積為4.0L的鋁壺.將一壺20℃的水燒開(kāi)需消耗液化石油氣0.056kg.試計(jì)算該燃料的利用率.[已知水的比熱為4.2kJ/.鋁的比熱為0.88kJ/]答案:50% 查看更多

 

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 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

 

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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

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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/molD.-1526 kJ/mol

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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

 

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在一定條件下,充分燃燒一定量的丁烷放出熱量的Q kJ(Q>0),經(jīng)測(cè)定完全吸收生成的CO2需消耗 5 mol·L-1 KOH溶液100 mL,恰好生成正鹽,則此條件下反應(yīng)C4H10(g)+O2(g)4CO2(g)+5H2O(g)的ΔH為(    )

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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