if 5.76 grams of co2 forms when 4.00 grams of c2h6 reacts, what is the percent yield for 2c2h6+7o2=4co2+6h2o

Answer 1

the theoretical yield is 2 moles of CO2 for each mole of C2H6

So,
how many moles of C2H6 did you use?
how many moles of CO2 in 5.76g?

compare your yield with the possible yield.