(a)
Interpretation:
The reference of the molar mass of a substance is to be stated.
Concept introduction:
Molar mass is defined as the sum of the masses of all the atoms present in a formula. Source from which the information is taken is known as a reference. Reference includes the online websites, any text book, research papers and many more.
(b)
Interpretation:
The reference of the physical properties of a substance is to be stated.
Concept introduction:
Physical properties are defined as the properties which are visible to our naked eyes. Properties such as melting point, boiling point, state, mass are known as the physical properties of a substance.
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