作者fxp611100 (哈茶儿)
看板TransBioChem
标题[化学] 普化计量问题
时间Wed Mar 12 23:37:30 2008
做了题目 发现有几题问题 请高手帮忙"> <"
1.consider a mineral salt perovskite MgSiO3.If some of the Si atoms are substituted by Al, determine the value x for the resultant non-stoichiometric perovskite compound MgSi(0.95) Al (0.01) 5Ox {*注0.95 0.01 为小写}
(A)2.9(B)2.95(C)2.975(D)3 ANS(C)
问~
x要怎麽求??
2.The oxidation numbers of P,S and Cl in H2PO2-,H2S and KClO4 are, respectively[95中兴]
ANS:(+1+2+7)
问~
S不是应该是-2吗?
3.P+F2→PFx,若与P 2.982g 参与反应能得12.129g的PFx 问x为多少?(P=31 F=19)[94台联大]
ANS:5
不知道怎麽算= =
有请高手解惑!!!
谢谢!!> <
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