Question

which choice identifies the correct limiting reactant and correct reasoning? co + 2h₂ → ch₃oh 2.50 g h₂ theoretically yields 19.8 g ch₃oh. 30.0 g co theoretically yields 34.3 g ch₃oh. h₂ because it has the lower theoretical yield; co because it has the higher theoretical yield; h₂ because it has the lower initial mass; co because it has the higher initial mass

Explanation:

To determine the limiting reactant, we compare the theoretical yields of the products from each reactant. The limiting reactant is the one that produces the smaller amount of product because it will be consumed first, limiting the amount of product formed. Here, \( \text{H}_2 \) yields \( 19.8 \, \text{g} \) of \( \text{CH}_3\text{OH} \), and \( \text{CO} \) yields \( 34.3 \, \text{g} \) of \( \text{CH}_3\text{OH} \). Since \( 19.8 \, \text{g} \) (from \( \text{H}_2 \)) is less than \( 34.3 \, \text{g} \) (from \( \text{CO} \)), \( \text{H}_2 \) is the limiting reactant because it has the lower theoretical yield. Initial mass is not the determining factor for the limiting reactant; it's the theoretical yield of the product.

Answer:

A. \( \text{H}_2 \) because it has the lower theoretical yield