Question

How many moles of carbon monoxide are there in 36.55g of carbon monoxide?

Answer 1

when the number of moles = mass/molar mass 

so the number of moles of CO = mass of CO sample/molar mass of CO

when the mass of CO sample = 36.55 g 

and the molar mass of CO = 12 + 16 = 28 g/mol

by substitution:

∴moles of carbon monoxide = 36.55 g / 28 g/mol

                                                 = 1.3 moles