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Calculate the solubility in mol dm-3 of 40g of CuSO4 diss...

Calculate the solubility in mol dm-3 of 40g of CuSO4 dissolved in 100g of water at 120°C?
[Cu = 64, S = 32, O = 16]

A.

4.00

B.

2.50

C.

0.40

D.

0.25

View answer & explanation

Correct answer is B

Solubility = $\frac{\text{number of moles of solution}}{\text{vol of solution}}$

100g of water = 100 cm $^3$ = 0.1 dm $^3$ .

CuSO $_4$ = 160 g/mol

No of moles of CuSO $_4$ in 40g = $\frac{40}{160}$

= 0.25 mol.

Solubility = $\frac{0.25}{0.1}$

= 2.5 moldm $^{-3}$ .

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