# Calculate the mol

The molar masses of all these substances will be equal to the respective molecular masses expressed in g/mol. Now:

(a) Molar mass of ethyne, C2H2 = Mass of C × 2 + Mass of H × 2

= 12 × 2 + 1 × 2

= 24 + 2

= 26 g/mol

(b) Molar mass of sulphur molecule, S8 = Mass of S × 8

= 32 × 8

= 256 g/mol

(c) Molar mass of phosphorus molecule, P4 = Mass of P × 4

= 31 × 4

= 124 g/mol

(d) Molar mass of hydrochloric acid, HCl = Mass of H + Mass of Cl

= 1 + 35.5

= 36.5 g/mol

(e) Molar mass of nitric acid, HNO3 = Mass of H + Mass of N + Mass of O × 3

= 1 + 14 + 16 × 3

= 15 + 48

= 63 g/mol

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