Question

(a) CH.NO, (b) CyHN20 (c) C,H,NO
49. The hydrated salt Na,co, XH,0 undergoes 63% loss in mass on heating and beca
anhydrous. The value of x is:
() 10
(b) 12
(c) 8
(d) 18
drate SOH), XH, is dried in an oven to give 3.13 g of anhy​

Answer 1

M Na 2

CO 3

=106M H 2O =18

Let the mass of salt is W.

Then 106+18n=W⟶(1)

After heating,

100

7W =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

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