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  4. Number of moles of water in 488 gm of BaCl 2 .2 H 2 O are(At. mass of Ba =137 )

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Q. Number of moles of water in $488 \, gm$ of $BaCl _{2} .2 H _{2} O$ are(At. mass of $Ba =137$ )

Some Basic Concepts of Chemistry

Solution:

$ 224\, g$ contain $36 \,g$ of water

$488\, g$ contain $2 \times 36 \,g$ of water

$18 g$ of water $=1 mole$

$72 g$ of water $=4 mole$