Find the percentage mass of water in the Epson salt $M g S O_{4} .7 H_{2} O$ .

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Solution

Relative molecular mass of mgso4. 7h2o
= $24 + 32 + 16 \times 4 + 7 \times (2 + 16)$
= $24 + 32 + 64 + 126$
=246

246g of Epsom salt contains 126g of water

.•. 100g will contain \(126 \times\ 100) ÷ 246
= 12600 ÷ 246
= 51.21g of H2O

The% of $H_{2} O$ in $M g S O_{4}$ . $7 H_{2} O$ = 51. 21

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