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Law of Conservation of Mass

2.8 g of calc...

Question

2.8 g of calcium oxide prepared by heating limestone produced 0.8 g of oxygen. Calculate the mass percentage of calcium.

A

71.4 %

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B

61.4 %

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C

81.6 %

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D

91.2 %

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Solution

The correct option is A $71.4 %$
Formula of calcium oxide $\to$ CaO.
$M a s s % o f C a = \frac{2.8 g - .8 g}{2.8 g} \times 100 = \frac{60}{60 + 360} \times 100 = 14.28 %$

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