1g丙烷和1g丁烷完全燃燒,放出的熱量都是50kJ,設(shè)若某石油液化氣由丙烷和丁烷組成.其質(zhì)量分?jǐn)?shù)分別為80%和20%.
(1)它們?nèi)紵臒峄瘜W(xué)方程式分別為:
C3H8(g)+5O2(g)═3CO2(g)+4H2O(g)△H(298K)=-2200kJ?mol-1
C3H8(g)+5O2(g)═3CO2(g)+4H2O(g)△H(298K)=-2200kJ?mol-1
;2C4H10(g)+13O2(g)═8CO2(g)+10H2O(g)△H(298K)=-5800kJ?mol-1
2C4H10(g)+13O2(g)═8CO2(g)+10H2O(g)△H(298K)=-5800kJ?mol-1
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(2)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)需消耗石油液化氣多少kg?[假設(shè)熱量利用率為60%,水的比熱為+4.2kJ/(kg?℃),鋁的比熱為0.88kJ/(kg?℃)].