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Question

A sample of calcium carbonate (CaCO3) has the percentage composition as given: Ca=40%, C=12%, O=48%.


If the law of constant proportions is true, then the weight of calcium in 4 g of a sample of calcium carbonate obtained from another source will be :

A
0.016 g
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B
0.16 g
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C
1.6 g
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D
16 g
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Solution

The correct option is C 1.6 g
In 100 g CaCO3, weight of Ca is 40 g.

In 4 g CaCO3, weight of Ca is =40100×4=1.6 g

Hence, the correct option is C

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