Question

The crystalline salt Na2CO3.XH20 on heating loses 63%
of its mass and becomes anhydrous. The formula of
the compound is​

Answer 1

Answer:

M

Na

2

CO

3

=106

M

H

2

O

=18

Let the mass of salt is W.

Then 106+18n=W⟶(1)

After heating,

100

37W

=106⟶(2) (63% is lost i.e, H

2

O is lost)

Putting (2) in (1),

⇒106+18n=

37

106×100

⇒18n=180.4

⇒n=10.02≃10