Question

Wt. of 3.01 x 1022 molecules of compound 'X'is 3
gm its mol, wt. will be:​

Answer 1

Answer:

The molecular weight of that substance = 60 grams

Explanation:

First of all we have to find that how much moles of the unknown substance are given

$number \: of \: moles = \frac{number \: of \: particles}{avogadros \: number}$

$moles = \frac{3.01 \times {10}^{22} }{6.023 \times {10}^{23} } = 0.05 \: mol$

Now we have the given mass= 3 grams

So we have to find the molecular weight of the unknown substance by another relation

$moles = \frac{mass \: in \: grams}{molecular \: weight} \\ molecular \: weight \: = \frac{mass \: in \: grams}{moles}$

Thus the molecular weight of that substance

= 3/0.05 = 60 grams