The number of moles of water in 976 g ${B a C l}_{2} 2 H_{2} O$ is:
(atomic masses of $H, O, C l,$ and $B a$ are 1, 16, 35, 5, and 137 respectively)

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Solution

Molecular mass of $B a C l_{2} .2 H_{2} O$
$= 137 + (35 \times 2) + (18 \times 2)$
$= 137 + 70 + 36$
$= 243 g$

$243 g$ of $B a C l_{2} .2 H_{2} O$ contains $2$ moles of water
$∴ 976 g$ of $B a C l_{2} .2 H_{2} O$ contains= $8$ moles of water .

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The solubility of Ba(OH)₂.8H₂O in water at 288 K is 5.6g per 100 g of water. What is morality of hydroxide ions in saturated solution of barium hydroxide at 288 K?(atomic masses:Ba - 137,O-16,H-1)

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The number of moles of water in 976 g BaCl22H2O is: (atomic masses of H, O, Cl, and Ba are 1, 16, 35, 5, and 137 respectively)

Molecular mass of BaCl2.2H2O=137+(35×2)+(18×2)=137+70+36=243g243g of BaCl2.2H2O contains 2 moles of water∴976g of BaCl2.2H2O contains= 8 moles of water .

The number of moles of water in 976 g ${B a C l}_{2} 2 H_{2} O$ is:
(atomic masses of $H, O, C l,$ and $B a$ are 1, 16, 35, 5, and 137 respectively)

Molecular mass of $B a C l_{2} .2 H_{2} O$
$= 137 + (35 \times 2) + (18 \times 2)$
$= 137 + 70 + 36$
$= 243 g$

$243 g$ of $B a C l_{2} .2 H_{2} O$ contains $2$ moles of water
$∴ 976 g$ of $B a C l_{2} .2 H_{2} O$ contains= $8$ moles of water .