Question

consider the balanced equation below.
pcl₃ + cl₂ → pcl₅
what is the mole ratio of pcl₃ to pcl₅?
○ 1:1
○ 2:1
○ 3:5
○ 5:3

Explanation:

Step1: Analyze the balanced equation

The balanced chemical equation is \( \text{PCl}_3 + \text{Cl}_2
ightarrow \text{PCl}_5 \). From the equation, we can see the coefficients of \( \text{PCl}_3 \) and \( \text{PCl}_5 \) are both 1 (since there is no number written in front, the coefficient is 1 by default).

Step2: Determine the mole ratio

The mole ratio of two substances in a chemical reaction is equal to the ratio of their coefficients in the balanced equation. So the mole ratio of \( \text{PCl}_3 \) to \( \text{PCl}_5 \) is the coefficient of \( \text{PCl}_3 \) divided by the coefficient of \( \text{PCl}_5 \), which is \( \frac{1}{1}=1:1 \).

Answer:

1:1 (corresponding to the option "1:1")