When 5.60 grams of anhydrous copper(II)sulfate is exposed to moist air,it absorbs water.If the hydrated copper compound has a mass of 8.13 grams,what is the chemical formula of the hydrate? A)CuSO₄∙ 2H₂O B)CuSO₄∙ 3H₂O C)CuSO₄∙ 4H₂O D)CuSO₄∙ 5H₂O

Question

Quizplus · Accepted Answer

1. Calculate the number of moles of anhydrous copper(II) sulfate: 
5.60g / 159.61 g/mol = 0.0352 mol

2. Calculate the number of moles of water absorbed: 
(8.13g - 5.60g) / 18.015 g/mol = 0.140 mol

3. Find the mole ratio of anhydrous copper(II) sulfate to water: 
0.0352 mol / 0.140 mol = 1 / 4

4. Write the chemical formula of the hydrate using the mole ratio: 
CuSO4 · 4H2O

When 560 Grams of Anhydrous Copper(II)sulfate Is Exposed to Moist Air,it