Question

b. 50.4 g cabr₂ to moles answer: 0.252 mol cabr₂

Explanation:

Step1: Find molar - mass of CaBr₂

The molar mass of Ca is 40.08 g/mol and Br is 79.90 g/mol. For CaBr₂, molar mass $M=(40.08 + 2\times79.90)\text{ g/mol}=199.88\text{ g/mol}$.

Step2: Calculate moles

Use the formula $n=\frac{m}{M}$, where $m = 50.4\text{ g}$ and $M = 199.88\text{ g/mol}$. So $n=\frac{50.4}{199.88}\text{ mol}\approx0.252\text{ mol}$.

Answer:

$0.252\text{ mol}$