The simplest formula for butane is C2H5 and its molecular mass is about 60. What is the molecular formula of butane?

##C_4H_10##
Find the ##M_r## of the compound’s simplest formula a.k.a the empirical formula ##C_2H_5##
(12.01 x 2) + (1.01 x 5) = 29.07g/mol
The ##M_r## of the molecular formula is 60g/mol, therefore we have to divide 60 by 29.07.
##60/29.07## = 2 (integer)
Multiply the entire empirical formula of butane by 2 to find the molecular formula.
##C_2H_5## ##->## ##C_4H_10##

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