Question

look at the reaction schemes in your journal or click the view image button below. how does the number of moles of agno₃ correlate to the number of moles of the alkaline earth metal chloride?
a) there should be half as many moles of agno₃ as xcl₂
b) there should be twice as many moles of agno₃ as xcl₂
c) there should be the same number of moles of each
d) we cannot tell before we have performed the reaction

Explanation:

Step1: Write the reaction equation

The reaction between an alkaline - earth metal chloride ($XCl_2$) and silver nitrate ($AgNO_3$) is $XCl_2 + 2AgNO_3
ightarrow X(NO_3)_2+2AgCl\downarrow$.

Step2: Analyze mole - ratio

From the balanced chemical equation, the mole ratio of $AgNO_3$ to $XCl_2$ is 2:1. That means for every 1 mole of $XCl_2$, 2 moles of $AgNO_3$ are required.

Answer:

B. There should be twice as many moles of $AgNO_3$ as $XCl_2$