J.R. S. answered 04/12/22
Ph.D. University Professor with 10+ years Tutoring Experience
2 C3H8 (g) + 10 O2 (g) --- 6 CO2 (g) + 8 H2O (g) ... balanced equation
a). Divide the moles of each reactant by the corresponding coefficient in the balanced equation. Whichever values comes out less is the limiting reactant.
For C3H8 we have .. 15 g C3H8 x 1 mol / 44.1 g = 0.340 mols C3H8 (÷2->0.17)
For O2 we have .. 40 g O2 x 1 mol / 32 g = 1.25 mols O2 (÷10->0.125)
Since 0.125 is less than 0.17, O2 is the limiting reactant
b). Use the moles of the limiting reactant and the stoichiometry to find grams of CO2 produced:
1.25 mols O2 x 6 mols CO2 / 10 mols O2 x 44 g CO2 / mol CO2 = 33 g CO2 produced