单选题 较易0.85 引用3 组卷183
汽油的主要成分为辛烷,25℃、101KPa时,5.7g辛烷完全燃烧时,放出热量275.9kJ,则辛烷燃烧热的热化学方程式为
A.C8H18(l)+12.5O2(g)=8CO2(g)+9H2O(l) △H=-5518 kJ/mol |
B.2C8H18(l)+25O2(g)=16CO2(g)+18H2O(l) △H=-5518 kJ/mol |
C.C8H18(l)+12.5O2(g)=8CO2(g)+9H2O(l) △H=+5518 kJ/mol |
D.C8H18(l)+12.5O2(g)=8CO2(g)+9H2O(g) △H=-5518 kJ/mol |
19-20高二下·陕西渭南·期末
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汽油的主要成分是辛烷,已知在25℃,101kPa下,1gC8H18(辛烷)完全燃烧生成二氧化碳和液态水时放出48.40kJ热量。以下热化学方程式正确的是( )
A.C8H18(l)+ |
B.16CO2(g)+18H2O(l)=2C8H18(l)+25O2(g) ΔH=+11035.20kJ·mol-1 |
C.2C8H18(l)+25O2(g)=16CO2(g)+18H2O(l) ΔH=+5517.60kJ·mol-1 |
D.C8H18(l)+ |
1g正丁烷(C4H10)燃烧生成CO2和液态的水,放出49.6KJ热量,则其热化学方程式为
A.2C4H10+13O2=8CO2+10H2O;△H=-5753.6KJ/mol |
B.2C4H10(g)+13O2(g)=8CO2(g)+10H2O(l);△H=-49.6KJ/mol |
C.2C4H10(g)+13O2(g)=8CO2(g)+10H2O(l);△H=-2876.8KJ/mol |
D.C4H10(g)+13/2O2(g)=4CO2(g)+5H2O(l);△H=-2876.8KJ/mol |
氢气(H2)、一氧化碳(CO)、辛烷(C8H18)、甲烷(CH4)燃烧的热化学方程式分别为:
H2 (g) +
O2(g) = H2O (l) △H = -285.8 kJ /mol
CO(g) +
O2(g) = CO2(g) △H = -283 kJ /mol
C8H18 (l) +
O2(g) = 8CO2(g) + 9H2O (l) △H = -5518 kJ /mol
CH4 (g) + 2O2(g) = CO2(g) + 2H2O (l) △H = -890.3 kJ /mol
相同质量的H2、CO、C8H18、CH4完全燃烧时,放出热量最少的是
H2 (g) +
CO(g) +
C8H18 (l) +
CH4 (g) + 2O2(g) = CO2(g) + 2H2O (l) △H = -890.3 kJ /mol
相同质量的H2、CO、C8H18、CH4完全燃烧时,放出热量最少的是
A.H2 (g) | B.CO(g) | C.C8H18 (l) | D.CH4 (g) |
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