Question

the mass of 1×10^22 molecules of cuso4.5h2o is?

Answer 1

1 mole of CuSO4.5H2O (249.5grams) contains Avogadro number of molecules.

That is,                         249.5 grams contain 6 x 10^23 molecules
             
Calculating we get      4.158 grams contain 1 x 10^22 molecules

here the answer is 4.158 grams.

:)

Answer 2

Answer:

The mass of $1\times 10^{22}$ molecules of copper sulfate pentahydrate is 4.144 g.

Explanation:

Number of molecules = $1\times 10^{22}$

Moles of $CuSO_4.5H_2O=\frac{1\times 10^{22}}{6.022\times 10^{23} mol^{-1}}=0.0166 mol$

$Moles=\frac{Mass}{\text{Molar mass}}$

$0.0166=\frac{Mass}{249.68 g/mol}$

Mass of copper sulfate pentahydrate =4.144 g

The mass of $1\times 10^{22}$ molecules of copper sulfate pentahydrate is 4.144 g.