Question

Copper(II) sulfate pentahydrate, CuSO4 ·5 H2O, (molar mass 250 g/mol) can be dehydrated by repeated heating in a crucible. Which value is closest to the percentage mass of water lost from the total mass of salt in the crucible when the crucible undergoes repetitive heatings until a constant mass is reached?25%13%36%26%

Answer 1

The percentage mass of water lost from the total mass of salt is 36%.

Step-by-step explanation:

Molar mass of copper sulfate pentahydrate ,
`CuSO_4.H_2O=250 g/mol`

Number of water crystallization = 5

Molar mass of water = 18 g/mol

Percentage of mass water = The percentage mass of water lost from the total mass of salt

Percentage of mass water:

`(5* 18 g/mol)/(250 g/mol)* 100=36\%`

The percentage mass of water lost from the total mass of salt is 36%.