Question

according to the graph, what part(s) of the reaction are present at the beginning of the reaction? reaction: 2a ⇌ a₂ concentration (m) a₂ a time (sec) you cannot determine from the graph. only the product, a₂, is present. only the reactant, a, is present. both the reactant, a, and product, a₂, are present.

Explanation:

At the start (time = 0), the concentration of \( A_2 \) is 0 (since its graph starts at the origin), while the concentration of \( A \) is non - zero (its graph starts with a non - zero value). So only the reactant \( A \) is present initially.

Answer:

Only the reactant, A, is present.