Answer:
57 g
Explanation:
Step 1: Write the balanced equation
C₃H₈ + 5 O₂ ⇒ 4 H₂O + 3 CO₂
Step 2: Calculate the mass corresponding to 25 g of propane
The molar mass of C₃H₈ is 44.1 g/mol.
25 g × 1 mol/44.1 g = 0.57 mol
Step 3: Calculate the theoretical yield of CO₂ from 0.57 moles of C₃H₈
The molar ratio of C₃H₈ to CO₂ is 1:3. The theoretical yield of CO₂ is 3/1 × 0.57 mol = 1.7 mol
Step 4: Calculate the real yield of CO₂
We will use the following expression.
real yield = theoretical yield × percent yield
real yield = 1.7 mol × 75%
real yield = 1.3 mol
Step 5: Calculate the mass corresponding to 1.3 moles of carbon dioxide
The molar mass of CO₂ is 44.01 g/mol.
1.3 mol × 44.01 g/mol = 57 g
