Question

calculate the no of molecules of sulpur present in 16g of sulphur (at mass of S =32u)

Answer 1

number of moles =
$\frac{given \: mass}{molecular \: mass}$
$\frac{16}{32} = \frac{1}{2}$
now,
number of moles= given no of molecules÷avagadroz no.
1/2=x/6.022×10 raise to power23

=3.011×10raise to power23

Answer 2

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