Question

if there are 4 grams of product produced by the chemical reaction, how many grams of reactant were consumed?
a 0 grams
b 1 gram
c 2 grams
d 4 grams

Explanation:

Step1: Apply law of conservation of mass

In a chemical reaction, the total mass of reactants is equal to the total mass of products.

Answer:

D. 4 grams