Question

in the reaction mgcl₂ + 2koh → mg(oh)₂ + 2kcl, how many moles of koh react with 1 mole of mgcl₂?
a. 2
b. 1
c. 3
d. 0.5

Explanation:

Step1: Analyze reaction coefficients

The balanced chemical equation is $MgCl_2 + 2KOH
ightarrow Mg(OH)_2+2KCl$. The coefficient of $MgCl_2$ is 1 and the coefficient of $KOH$ is 2.

Step2: Determine mole - ratio

The mole - ratio of $KOH$ to $MgCl_2$ is 2:1 according to the coefficients in the balanced equation. So for 1 mole of $MgCl_2$, 2 moles of $KOH$ react.

Answer:

A. 2