Question

How many litres of 25% (mass/ volume) copper sulphate solution would take to get 85g of copper sulphate?
i need answers asap
will mark as brainleist

Answer 1

Molarity, M=number of moles/volume of solution

M=

V

n

Number of moles, n=mass/molar mass

Molar mass of CuSO

4

=159.5 g/mole

mass=80g

n=

159.5

80

=0.5 mole

∴M=

3

0.5

=0.167 mole/L

Answer 2

$\twoheadrightarrow\underline{\boxed{\pmb{\frak{\purple{ Solution: }}}}}\;\bigstar$

$\large{ \blue{\mathfrak{ \underline{\overline{\mid \:\: we\:know\:\: \mid}}}}}$

$M = V n$

$\large{ \red{\mathfrak{ \underline{\overline{\mid \:\: no\:of\:moles\:(n) \:\: \mid}}}}}$= $\large{ \pink{\mathfrak{ \underline{\overline{\mid \:\: mass\ \:\: \mid}}}}}$$\large{ \pink{\mathfrak{ \underline{\overline{\mid \:\: molar\:mass\:\: \mid}}}}}$

$\large{ \green{\mathfrak{ \underline{\overline{\mid \:\: molar\:mass\:of\:cuso4\:=\:159.5 g\:/\:80 g\:</p><p>=\:0.5 mole\:\: \mid}}}}}$

$\large{ \green{\mathfrak{ \underline{\overline{\mid \:\: M\:=\:0.167\:mole\:/\:lit\:\: \mid}}}}}$