Question

a + b → c + d
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: Recall the Law of Conservation of Mass

In a chemical reaction, the total mass of reactants consumed equals the total mass of products formed. This is based on the Law of Conservation of Mass, which states that mass is neither created nor destroyed in a chemical reaction.

Step2: Apply the Law to the Given Reaction

The reaction is \( A + B
ightarrow C + D \). The total mass of products (\( C + D \)) is 4 grams. By the Law of Conservation of Mass, the total mass of reactants (\( A + B \)) consumed must equal the mass of products formed.

Answer:

D. 4 grams