题目

向恒温恒容的密闭容器中充入amolX和bmolY,发生反应X(g)+3Y(g)2Z(g)达到平衡时,测得X和Y的转化率分别为25%和37.5%。则a:b为(       ) A.1 3              B.3 1               C.3 2               D.1 2 答案:【答案】D 【解析】X(g)+3Y(g)2Z(g) 起始量(mol)    a              b                0 起始量(mol)    x              3x              2x                   起始量(mol)   a-x          b-3x            2x 由题意知:  :  =25% :37.5% 解之得:a:b=1:2_______2012 warm weather fashion season is all about _______ nature and flowers with a focus on rainforest.A.A; 不填B.不填; theC.The; aD.The; 不填
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