Q. 64.1( 160 Votes )

Calculate the mol

Answer :

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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