All you do is add up the molar masses of the carbons and hydrogens in the formula. Most peiordic tables show the molar masses of elements (also called their molecular weights) underneath their chemical symbols.
4(molar mass of carbon) + 10(molar mass of hydrogen) = 4(12.0107 g/mol) + 10(1.00794 g/mol)
= 58.1222 g/mol
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