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A sample of calcuium carbonate (CaCO(3))...

A sample of calcuium carbonate `(CaCO_(3))` has the following percentage composition: `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

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100% pure H_(2)O_(2) from a 90% sample can be obtained by