Question

Calculate the mass, in grams, of each of the following.You may round atomic masses to one decimal place.1)3.95 mol BaSO42)4.66×10−2 mol CuCl2

Answer 1

To convert the given amount of moles to mass, we have to use the molar mass of each of the compounds.

BaSO₄ has a molar mass of 233.38g/mol. Use this as a conversion factor to find the mass of 3.95 moles of BaSO₄:

$3.95molBaSO_4\cdot\frac{233.4gBaSO_4}{molBaSO_4}=921.93gBaSO_4$

3.95mol BaSO₄ are 921.93g of BaSO₄ .

CuCl₂ has a molar mass of 134.45g/mol. Use this as a conversion factor, just as we did with BaSO₄:

$4.66\times10^{-2}molCuCl_2\cdot\frac{134.4gCuCl_2}{^{}molCuCl_2}=6.26gCuCl_2$

4.66x10^-2mol CuCl₂ are 6.26g of CuCl₂.