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(a) What is meant by the 'molar mass' of a substance? State the unit in which molar mass is usually expressed.(b) Calculate the molar masses of the following substances. Write the results with proper units.(i) Ozone molecule, O3(ii) Ethanoic acid, CH3COOH
(a) Molar mass of a substance is the mass in grams. It is numerically equivalent to the sum of atomic masses of individual atoms in the molecular formula of that substance.
The molar mass of a substance is usually expressed as grams/mole.
(b) To calculate-
(i) Molar mass of ozone (O3)
Molar mass of ozone = 16 + 16 +16 = 48 g/mol
(ii) Molar mass of acetic acid (CH3COOH)
Molar mass of acetic acid = (2 × 12) + (4 × 1) + (2 × 16) = 60 g/mol
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