Question

What is the molecular mass of propane ?
A) 44 g/mol 
B) 60 g/mol
C) 88 g/mol 
D) 30 g/mol​

Answer 1

Answer

OPTION A) 44 g/mol

Explanation

Molecular mass can be calculated by calculating the mass of each element present in the propane . The chemical formula of propane is C₃H₈ . We know that the compound which has word root of 'prop' has 3 carbon atoms . We also know that the mass of each carbon atom is 12 g . Hence the mass of 3 carbon atoms will be 12 × 3 = 36 . Also the mass of 8 hydrogen atoms can be calculated as we know that each hydrogen atom has gram atomic mass of 1 g . Hence 8 such hydrogen atoms will have 8 × 1 = 8 g . Total molecular mass of the compound is 36 + 8 = 44 . Since molecular mass is expressed in grams/moles the molecular mass of propane is 44 g/mol and hence Option A is correct .

Answer 2

Propane is C3H8

Now we know atomic mass of carbon is 12 and for hydrogen is 1

So molecular mass = 3× 12 + 8×1

= 36 +8 = 44 g/mol

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