Question

A chemist only has 6. 50 grams of C2H2 and an unlimited supply of oxygen and he

desires to produce as much CO2as possible. If he uses the equation below, how much

oxygen should he add to the reaction?

2C2H2 (g ) + 5O2(g) → 4CO2(g) + 2 H2O(l)

Answer 1

There is 6.50 g / 26 g/mole = 0.25 moles of C2H2.

According to reaction stoichometry, chemist needs 0.25/2*5 = 0.625 moles of oxygen.

The mass of O2 is 0.625 mole * 32 g/mole = 20 grams of oxygen