Question

32 g of oxygen reacts with some carbon to make 56 grams of carbon monoxide. Find out how much mass must have been used.

Answer 1

Given : 

Mass of oxygen (reactant) = 32 g, 

Mass of carbon monoxide (product) = 56 g 

To find : 

Mass of oxygen (reactant) 

Calculation : 

12 g of carbon combine with 16 g oxygen to form 28 g of carbon monoxide as follows :

Hence, 

(2 × 12 = 24 g) of carbon will combine with (2 × 16 = 32 g) of oxygen to give (2 × 28 = 56 g) carbon monoxide.

∴ Mass of carbon used = 24 g