calculate the mass of carbon4oxide produce on heating 105g of ethane( C2 H4

C4O = 64 g/mol

C2H4 = 24+4 = 28 g/mol
https://www.webqc.org/molecular-weight-of-C4O.html
4C2H4 + 3O2 ----> 2C4O + 4H2O ???
105/28 = x mols of C2H4
for every 4 mols of C2H4 I get 2 of C4O
so
x/2 mols of C4O
which is
(64/2) (105/28) grams