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  4. A hydrate of Na 2 SO 3 has 50 % water by mass. It is

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Q. A hydrate of $Na _2 SO _3$ has $50 \%$ water by mass. It is

Some Basic Concepts of Chemistry

Solution:

$Na _2 SO _3: H _2 O \equiv 50: 50\left( Mw\right.$ of $\left.Na _2 SO _3=126\right)$
Mole: $\frac{50}{126}: \frac{50}{18}$
Ratio: $1: 7$