MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryMole _ Equivalent ConceptAtomic Theory
A sample of CaCO₃ has Ca = 40%, C = 12% and O = 48%. If the law of constant proportions is true, then the mass of Ca in 5 g of CaCO₃ from another source will be :
A.2.0g✓ Correct
B.0.2g
C.0.02g
D.20.0g
Explanation
3 CaCO contains 40% of Ca ∴ wt. of Ca in 5g of 3 5 40 2 100 CaCO x g
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