Question

How many grams of CuSO4 must be dissolved in 100 mL of total solution to create a 0.25 M solution of CuSO4?

A) 4 g

B) 25 g

C) 40 g

D) 159 g

Answer 1

A) 4 g

Step-by-step explanation:

Data:

V =100 mL = 0.1 L

M = 0.25M

g = ?

Molarity

`M=(mol)/(volume)`

The moles are cleared from this equation:

`mol=M*V=0.25M*0.1L=0.025mol CuSO_(4)`

Through the molecular weight, the grams of CuSO4 are calculated, knowing that the molecular weight of CuSO4 is 160 g/mol.

`MW=(mol)/(mass)`

`mass=MW*mol=160(g)/(mol) *0.025mol=4 g CuSO_(4)`