Question

Q.1
1.61 gm of Na2SO4.10H,0 contains same number of oxygen atoms as present in
(A) 0.98 gm H2SO4
(B) 0.08 gm SOZ
*(C) 1.78 gm H $20,
(D) 0.05 gm CaCO3
​

Answer 1

Answer:

The molar mass of Na

2

SO

4

.10H

2

O is

2(23)+32+4(16)+10(18)=322 g/mol.

1 mole of Na

2

SO

4

.10H

2

O contains 14 moles of O atoms.

1 mole of Na

2

SO

4

.10H

2

O corresponds to 14×16=224 g of O.

Amount of oxygen in 32.2g of Na

2

SO

4

.10H

2

O is 32.2×224322=22.4 g

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