Question Detail
Question
In the reaction: SiO₂ + 3C → SiC + 2CO, if 30.0 g of SiO₂ reacts with 30.0 g of C, which is the limiting reactant? (Si=28, O=16, C=12)
Correct Answer
Option A is the correct answer.
Detailed Explanation
Molar mass SiO₂ = 60 g/mol. Moles SiO₂ = 30.0/60 = 0.500 mol. Moles C = 30.0/12 = 2.50 mol. Reaction requires 3 mol C per 1 mol SiO₂. C needed = 0.500 × 3 = 1.50 mol. C available = 2.50 mol, so SiO₂ is limiting.
Hint
Calculate the moles of each reactant and compare to the required ratio.