QJEEM21Ch4992: JEE Main 2021 Chemistry - Class 11 JEEM21Ch4992 Solution: If 80 g of copper sulphate CuSO 4 . 5H 2 O is dissolved in…

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QJEEM21Ch4992: JEE Main 2021 Chemistry - Class 11 JEEM21Ch4992 Solution: If 80 g of copper sulphate CuSO 4 . 5H 2 O is dissolved in…

If 80 g of copper sulphate CuSO₄ . 5H₂O is dissolved in deionised water to make 5L of solution. The concentration of the copper sulphate solution is x

\times

10^{$-$ 3} mol L^{$-$ 1}. The value of x is _____________.

[Atomic masses Cu : 63.54u, S : 32u, O : 16u, H : 1u]

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Accepted Answer

Given, mass of CuSO₄ . 5H₂O = 80 g

The concentration of copper sulphate solution is x

\times

10^{$-$ 3} mol/L.

Molarity =

\frac{N u m b e r o f m o l e s o f s o l u t e}{V o l u m e o f s o l u t i o n (L)}

..... (i)

Molar mass of CuSO₄ . 5H₂O = 63.54 + 32 + 16

\times

4

= 5

\times

18 = 249.54 g/mol

Number of moles of solute =

\frac{W e i g h t o f s o l u t e}{M o l e c u l a r m a s s o f s o l u t e}

=

\frac{80 g}{249.54 g / m o l}

= 0.32 mol

Volume of solution = 5 L

From Eq. (i),

Molarity =

\frac{0.3205}{5}

= 64.11

\times

10^{$-$ 3} mol/L

∴

x = 64.11

or x

\approx

64

Hence, answer is 64.

QJEEM21Ch4992: JEE Main 2021 Chemistry - Class 11 JEEM21Ch4992 Solution: If 80 g of copper sulphate CuSO 4 . 5H 2 O is dissolved in…

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