A.77.6 kJ | B.-77.6 kJ·mol-1 | C.+77.6kJ·mol-1 | D.-886.8kJ·mol-1 |
A.1.8△H | B.2△H | C.△H | D.0.9△H |
A.2H+(aq) +SO42-(aq)+Ba2+(aq)+2OH-(aq)=BaSO4(s)+2H2O(1);ΔH=-57.3 kJ/mol |
B.KOH(aq)+H2 SO4(aq)=K2SO4(aq)+H2O(l);ΔH=-57.3kJ/mol |
C.2C8H18(g)+25O2(g)=16CO2(g)+18H2O(1);ΔH=-5518 kJ/mol |
D.C8H18(l)+ 25/2 O2(g)=8CO2(g)+ 9H2O(1);ΔH=-5518 kJ/mol |
A.─484KJ/moL | B.+484KJ/moL | C.─242KJ/moL | D.+242KJ/moL |
250℃: K1=__________ | 300℃: K2=0.270 | 350℃: K3=0.012 |
A.由于红磷转化为白磷是放热反应,等质量的红磷能量比白磷低 |
B.稀硫酸与稀NaOH溶液反应的中和热△H=57.3 kJ/mol |
C.碳的燃烧热大于-110.5 kJ/mol |
D.稀醋酸与稀NaOH溶液反应生成1 mol水,△H 大于 -57.3 kJ/mol |
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