Determine the percentage comosition of calcium in calcium hydroxide, $C a (O H)_{2}$ . $(1$ mol $= 74 g)$

40 %

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43 %

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54 %

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69 %

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74 %

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Solution

The correct option is D $54 %$
The atomic mass of Ca is 40.1 g/mol.
The molar mass of $C a (O H)_{2} = 74 g / m o l$ .
1 mole of $C a (O H)_{2} =$ 74 g $C a (O H)_{2} = 40.1$ g Ca
The percentage composition of calcium in calcium hydroxide $= \frac{40.1 \times 100}{74} = 54$ %.

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