Answer to Question #340568 in General Chemistry for Emma

Question

Mass of CuSO4● XH2O (g) = 1.6 grams BEFORE HEATING

After Heating :

Mass of H2O(g) = 1.1g

Mass of CuSO4 (g) : 0.5

QUESTION:

Use the information to calculate the number of moles of water lost and the number of moles in the anhydrous compound

Answer 1

$M(H_2O)=2x1+16=18 g/mole$

$n(H_2O)=1.1/18=0.061 mole$

$M(CuSO_4)=64+32+4x16=160 g/mole$

$n(CuSO_4)=0.5/160=0.0031 mole$

$n(H_2O)/n(CuSO_4)=0.061/0.0031=20$

So formula is $CuSO_4x20H_2O$