How many grams of carbon..?

Question

How many grams of carbon dioxide can form when a mixture of 4.95 g ethylene (C2H4) and 3.25 g of oxygen is ignited, assuming complete combustion to form carbon dioxide and water

Thank you for your time

10 points

Answer 1

molar mass of C2H4 is = {2(12)+4(1)} g mol-1

                                 = 28 g mol-1

molar mass of O2(oxygen) is = { 2(16) } g mol-1

                                           = 32 g mol-1

molar mass of CO2 (carbon dioxide) is ={ 12 + 2(16) } g mol-1

                                                         = 44g mol-1

no. of moles in C2H4 is = 4.95g/28 g mol-1

                                   = 0.2 mol

no. of moles in O2= 3.25g/ 32g mol-1

                           =0.1mol

combustion of ethylene & oxygen is C2H4 + 3(O2) = 2(CO2) + 2(H2O)

since you obtain 0.4moles of carbon dioxide (0.2 x 2) , hence

0.4 mol x 44g mol-1= 17.6g of carbon dioxide

sorry 4 the long explanation, but i hope it helps. (minus any careless mistakes)