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Discovery of Sulphuric Acid

Define 'molec...

Question

Define 'molecular mass' of a substance.

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Solution

The molecular mass of a substance is the relative mass of its one molecule as compared with a ${}_{6}^{12}C$ atom. The mass of an atom of ${}_{6}^{12}C$ is considered to be 12 a.m.u.

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Q. (a) Define gram molecular mass of a substance. How much is the gram molecular mass of oxygen?
(b) If sulphur exists as S₈ Molecules, calculate the number of moles in 100 g of sulphur. (S = 32 u)

Mass of a given substance = Number of moles $\times$ gram molecular mass of the substance.

Q. The mass of a single molecule of a compound is called the molecular mass of the substance.

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Molecular mass of volatile substance may be obtained by

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