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Q.

4 moles of $Ca {(OH)}_{2} weighs$

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a

296 g

b

396g

c

400g

d

300g

answer is A.

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Detailed Solution

Weight of one mole of $Ca {(OH)}_{2} = 74 g$

Weight of 4 moles of $Ca {(OH)}_{2}$ is equal to

$= \frac{74 g}{1 mol Ca {(OH)}_{2}} \times 4 m o l C a {(O H)}_{2}$

$= 296 g$

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