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Percentage Composition

What is the p...

Question

What is the percentage of calcium in calcium carbonate $(C a C O_{3})$ ?

A

30%

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B

40%

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C

50%

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D

60%

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Solution

The correct option is B 40%
Molecular weight of ${C a C O}_{3} = 40 + 12 + 3 \times 16$
$= 52 + 48 = 100 g$
$100 g m$ of ${C a C O}_{3}$ contains $40 g m$ of $C a$
$∴$ % of $C a$ in ${C a C O}_{3}$ $= \frac{40}{100} \times 100 = 40$ %

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