Define the following terms:
(i) Atomic mass
(ii) Molecular mass
(iii) Formula mass

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Solution

(i) The mass of an individual atom of an element is known as its atomic mass.
(ii) The molecular mass of a substance is the sum of the atomic masses of the atoms present in that molecule or compound.
(iii) The formula mass of a substance is the sum of masses of all ions in a formula unit.

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QUESTION 2.3 (I)

Define the following term:

(i) Mole fraction

(ii) Molality

(iii) Molarity

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(b) molar volume
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