Question

When copper (II) sulfate pentahydrate (CuSO4•5H2O) is heated, the water is driven off, leaving behind solid copper (II) sulfate (CuSO4) according to the equation below: CuSO4•5H2O → CuSO4 + 5H2O Describe how a chemist should set up his or her stoichiometric calculation to predict the mass of CuSO4 that forms when a specified mass of CuSO4•5H2O is heated.

Answer 1

The chemist should set up his or her stoichiometric calculation to predict the mass of CuSO4 that forms when a specified mass of CuSO4•5H2O is heated. By dividing first the mass of CuSO4•5H2O by its molar mass then multiply it by the stoichiometric ratio of CuSO4/ CuSO4•5H2O and then multiply the molar mass of CuSO4.

Answer 2

Convert mass of CuSO4•5H2O to moles using molar mass of CuSO4•5H2O.

Convert moles of CuSO4•5H2O to moles of CuSO4 using a mole ratio.

Convert moles of CuSO4 to mass of CuSO4 using molar mass of CuSO4.