How many grams of carbon are required to combine with 1.99 g of oxygen in C₂H₅OH? Hint: Use moles as an intermediary unit and focus on the ratio of carbon to oxygen in the formula.

Question

Quizplus · Accepted Answer

In C₂H₅OH, the ratio of carbon to oxygen is 2:1. The molar mass of oxygen is 16 g/mol, so 1.99 g of oxygen is 1.99/16 = 0.124 mol. Since the ratio is 2:1, you need 2 * 0.124 = 0.248 mol of carbon. The molar mass of carbon is 12 g/mol, so 0.248 mol of carbon is 0.248 * 12 = 2.976 g, which rounds to 2.99 g.

How Many Grams of Carbon Are Required to Combine with 1.99