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Atomic Number and Mass Number

What is the p...

Question

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

A

10%

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B

40%

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C

20%

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D

30%

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Solution

The correct option is B 40%
$C a C O_{3}$
$1 C a$ atom molar mass= $40$
$1 C$ atom molar mass = $12$
$1 O x y g e n$ atom molar mass = $16$
Total = $40 + 12 + 16 \times 3$
$= 100$
$% C a = \frac{40}{100} \times 100$
$= 40 %$

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