Question

The mass in grams of a sample of CaBr 2 that contains 15.0 grams of calcium is:

Answer 1

So,

The molar mass of CaBr2 is 199.89g/mol.

In this amount, there's 40g of Ca.

Our sample contains 15g of Ca, so, we could state the following equality:

Now,

`x=\frac{15\text{gCa}\cdot199.89\text{gCaBr}2}{40\text{gCa}}=74.8\text{gCaBr}2`

Therefore, in a sample that contais 15.0g of Calcium, there's 74.8 grams of CaBr2.