Give the percent yield when 28.16 g of CO2 are formed from the reaction of 5.000 moles of C8H18 with 5.000 moles of O2.
2 C8H18 + 25O2→ 16 CO2 + 18H20
To find the theoretical yield of CO2, we need to first determine the limiting reactant.
1. Calculate the moles of CO2 that can be formed from each reactant:
From C8H18: 5.000 moles C8H18 x (16 moles CO2 / 2 moles C8H18) = 40.000 moles CO2
From O2: 5.000 moles O2 x (16 moles CO2 / 25 moles O2) = 3.200 moles CO2
2. Since O2 produces fewer moles of CO2, O2 is the limiting reactant.
3. Calculate the theoretical yield of CO2 based on O2:
3.200 moles CO2 x (44.01 g CO2 / 1 mole CO2) = 140.82 g CO2
4. Calculate the percent yield:
Percent Yield = (Actual yield / Theoretical yield) x 100%
Percent Yield = (28.16 g / 140.82 g) x 100%
Percent Yield ≈ 20.0%
The percent yield of CO2 when 28.16 g are formed is approximately 20.0%.