how many moles of o2 are needed to react with 2.00 moles of c2h2
First balance the equation 2 C2H2 +5 O2 = 4 CO2 + 2 H2O moles C2H2 = 2.30 g/ 26.038 g/mol=0.0883 the ratio between C2H2 and O2 is 2: 5 moles O2 required = 0.0883 x 5 /2 =0.221. Dr.A Â· 5 years ago.Thumbs up.ating Newest Oldest. Best Answer: 1. Write the balanced chemical equation for the reaction. 2C2H2 + 5O2 = 4CO2 + 2H2O 2. Determine the number of moles of 2.30 grams C2H2.