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Calculate the percentage composition of oxygen in calcium...

Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16]

A.

16

B.

48

C.

40

D.

12

View answer & explanation

Correct answer is B

Calcium trioxocarbonate (IV) = CaCO $_3$

Percentage of Oxygen = $\frac{\text{Molar mass of 3O}}{\text{Molar mass of} CaCO_3}$ × 100%

Percentage of Oxygen = $\frac{(3 \times 16)}{(40 + 12 + 48)}$ x 100%

Percentage of Oxygen = $\frac{48}{100}$ x 100%

Percentage of Oxygen = 48%

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