|
|
|
|
|
| Author |
Message |
![[Post New]](/templates/default/images/icon_minipost_new.gif) 19 Jan 2008 17:50:48 IST
|
|
|
Q.The hydrated salt Na2SO4 .nH2O undergoes 56% loss in weight on heating and becomes anhydrous.The value of "n" is? 1.5 2.7 3.4 4.10
|
|
|
|
|
|
|
|
Write the equation and equate the molecular masses you
will surely get the answer to be 10
|
__________________________________________________________________________________________________________
From J.R.R. Tolkien's 'The Lord of the Rings':
All that is gold does not glitter
Not all who wander are lost
The old that is strong does not wither,
Deep roots are not reached by frost.
From ashes a fire shall be woken
From shadows a light shall spring
Renewed shall be blade that's broken
The crown less again shall be king. |
this reply: 7 points
(with 1 
in 2 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
19 Jan 2008 18:09:30 IST
|
|
|
Molecular weight of Na2SO4 .NH2O =23.2 +32 +16.4+ n(2+16) =142 +18n Now since it loses 56% 0n becoming anhydrous ,therefore weight of water in the compound is 56 % = (56 /100) 142 + 18n = 18n On solving n = 10
|
this reply: 7 points
(with 1
in 2 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
19 Jan 2008 20:51:50 IST
|
|
|
hey!can ya juz explain how u derived dat eq..56/100*142+18n=18?????
|
this reply: 0 points
(with 0
in 0 votes ) [?]
|
|
You have to be logged on to rate
|
|
|
|
|
|
|
|
|
|
Moderation Team
![[Up]](/templates/default/images/icon_up.gif "[Up]"){kind=icon}
