單項(xiàng)選擇題已知298K時(shí),CO2(g)的△H為-393.5kJ·mol-1,H2O(l)的△H為-285.8kJ·mol-1,乙炔的燃燒熱為-1300kJ·mol-1,則乙炔的標(biāo)準(zhǔn)生成熱為()

A.227.2kJ·mol-1
B.-227.2kJ·mol-1
C.798.8kJ·mol-1
D.-798.8kJ·mol-1


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2.單項(xiàng)選擇題已知反應(yīng)Cu2O(s)+O2(g)2CuO(s)在300K時(shí),其△G=-107.9kJ·mol-1,400K時(shí),△G=-95.33kJ·mol-1,則該反應(yīng)的△H和△S近似各為()

A.187.4kJ·mol-1;-0.126kJ·mol-1·K-1
B.-187.4kJ·mol-1;0.126kJ·mol-1·K-1
C.-145.6kJ·mol-1;-0.126kJ·mol-1·K-1
D.145.6kJ·mol-1;-0.126kJ·mol-1·K-1

3.多項(xiàng)選擇題下列情況下,結(jié)論正確的是()

A.當(dāng)△H>0,△S<0時(shí),反應(yīng)自發(fā);
B.當(dāng)△H<0,△S>0時(shí),反應(yīng)自發(fā);
C.當(dāng)△H<0,△S<0時(shí),低溫非自發(fā),高溫自發(fā);
D.當(dāng)△H>0,△S>0時(shí),低溫非自發(fā),高溫自發(fā);
E.當(dāng)△H>0,△S>0時(shí),任何溫度下均不自發(fā)

4.單項(xiàng)選擇題等溫等壓過(guò)程在高溫不自發(fā)進(jìn)行而在低溫時(shí)可自發(fā)進(jìn)行的條件是()

A.△H<0,△S<0
B.△H>0,△S<0
C.△H<0,△S>0
D.△H>0,△S>0

5.多項(xiàng)選擇題已知:298K.101.325kPa下:△H(kJ·mol-1)S(J·mol-1·K-1);石墨0.05.74;金剛石1.882.39;下列哪些敘述是正確的()

A.根據(jù)焓和熵的觀點(diǎn),石墨比金剛石穩(wěn)定;
B.根據(jù)焓和熵的觀點(diǎn),金剛石比石墨穩(wěn)定;
C.根據(jù)熵的觀點(diǎn),石墨比金剛石穩(wěn)定,但根據(jù)焓的觀點(diǎn),金剛石比石墨穩(wěn)定;
D.根據(jù)焓的觀點(diǎn)石墨比金剛石穩(wěn)定,但根據(jù)熵的觀點(diǎn)金剛石比石墨穩(wěn)定;
E.△G(金剛石)>△G(石墨)