|
|
楼主 |
发表于 25-12-2009 01:15 PM
|
显示全部楼层
1.a gaseous hydride of hydrogen, X contains 12.5% hydrogen by mass.when 1 mole of X is heated strongly, it dissociate into 3 mole of thegaseous element. the formula of X is.......
2.0.52g of metal Y reduces an aques X2+ solution to produce 0.96g metalX and itself is oxidised to Y3+. what is the relatine atomic mass of Y(X,64)
3. NCl3 consists of 3 isotopes 14N, 35Cl and 37Cl. how many lines arefound in mass spectrum of NCl3 which correspond to molecular andfragmented molecular ions excluding atomic ions? reason???
4.when 30cc of an hydride of element X was heated,gaseous X and 60 ccof hydrogen formed. how many hydrogen atoms are there in amolecules ofthe hydride.
5. combustion of 20cc of a gas containing elements nitrogen andhydrogen in excess oxygen produces 10cc of nitrogen gas and 30cc ofwater vapour. what is the formula of the gas
6.explain how hydrogen donding affects the boiling pt of water?
谁能解答吗...(写STEP出来)
这是我从STPM专区拿回来的问题...
原帖http://cforum1.cari.com.my/viewthread.php?tid=1813681&extra=page%3D2 |
|
|
|
|
|
|
|
|
|
|
|
楼主 |
发表于 25-12-2009 01:25 PM
|
显示全部楼层
1.agaseous hydride of hydrogen, X contains 12.5% hydrogen by mass. when 1mole of X is heated strongly, it dissociate into 3 mole of the gaseouselement. the formula of X is.......
2.0.52g of metal Y reduces an aques X2+ solution to produce 0.96g metalX and itself is oxidised to Y3+. what is the relatine atomic mass of Y(X,64)
3. NCl3 consists of 3 isotopes 14N, 35Cl and 37Cl. how many lines arefound in mass spectrum of NCl3 which correspond to molecular andfragmented molecular ions excluding atomic ions? reason???
4.when 30cc of an hydride of element X was heated,gaseous X and 60 ccof hydrogen formed. how many hydrogen atoms are there in amolecules ofthe hydride.
5. combustion of 20cc of a gas containing elements nitrogen andhydrogen in excess oxygen produces 10cc of nitrogen gas and 30cc ofwater vapour. what is the formula of the gas
6.explain how hydrogen donding affects the boiling pt of water?
STPM那边拿来的问题...很想知道STEP
原帖http://cforum1.cari.com.my/viewthread.php?tid=1813681&extra=page%3D1 |
|
|
|
|
|
|
|
|
|
|
|
发表于 6-9-2010 08:18 AM
|
显示全部楼层
回复 3# oceanheng
因为要balance equation ~~~ |
|
|
|
|
|
|
|
|
|
| |
 本周最热论坛帖子
|
1519 
57
