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  4. Number of gram of oxygen in 322 g of Na 2 SO 4-10 H 2 O is:

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Q. Number of gram of oxygen in $322\, g$ of $Na _{2} SO _{4}-10 H _{2} O$ is:

BHUBHU 2005

Solution:

$1 \,mol$ of $Na _{2} SO _{4} \cdot 10 H _{2} O$ has $14\, g$-atom of oxygen.
or $322 \,g$ of $Na _{2} SO _{4} \cdot 10 H _{2} O$ has $14 \times 16=224 \,g$ of oxygen.