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InterviewSolution
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(a) What is the law of conservation of mass? (b) Calculate the molecular mass of calcium carbonate. (Atomic mass of Ca = 40 u, C = 12 u, and O= 16 u) |
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Answer» law of conservation of mass states that mass can be neither created nor DESTROYED during a chemical reaction. It means that the total mass of the reactants and the products involved in a reaction remains the same. (b) The molecular mass of a substance is the sum of the ATOMIC masses of all the ATOMS present in 1 molecule of that substance.The chemical formula of calcium carbonate is CaCO3Atomic mass of Ca = 40 uAtomic mass of C = 12 uAtomic mass of O = 16 U∴Molecular mass of CaCO3 = [(1 × 40) + (1 × 12) + (3 × 16)] u = 100 uThus, the molecular mass of CaCO3 is 100 u. |
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