Question

Determine the number of molecules in 0.592 grams of the fictional compound C51H2

Answer 1

Moles of C51H2 = 0.592/molar mass of C51H2 
                           = 0.592/614.067 
                           =  9.64 x 10^-4

Number of molecules = moles x 6.02 x 10^23
                                   =   5.803 x 10^20 molecules.

Hope this helps!