Achemical equation is shown: c2h4 + o2 → co2 + h2o according to the law of conservation of mass, how many atoms of oxygen exist in the products of this reaction? 5 6 7 8

C2H4 + O2 → CO2 + H2O

eqn is unbalanced - balancing by counting no. of C n H atoms

C=2 n H=4 in one C2H4

so the reaction will form two CO2 + two H2O

counting no. of O atoms: 2*2 + 2*1

=4+2

=6

c) should be the answer.