题目

已知：①H2O(g)＝H2O(l)；△H=Q1 kJ·mol－1 ②C2H5OH(g) = C2H5OH(l)；△H=Q2 kJ·mol－1 ③C2H5OH(g) + 3O2(g) = 2CO2(g) + 3H2O(g)；△H=Q3 kJ·mol－1 若使23g酒精液体完全燃烧最后恢复到室温，则此反应的△H为（    ） A．Q1 + Q2 + Q3                                                 B．0.5(Q1 + Q2 + Q3) C．0.5Q1 – 1.5Q2 + 0.5Q3        D．1.5Q1 – 0.5Q2 + 0.5Q3 49. Western people usually say “_____ New Year and _____ Christmas.” A. Happy; Happy          B. Merry; Happy           C. Merry; Merry           D. Happy; Merry