Question

can you suggest a formula to calculate number of moles of a substance from molecules? how many moles are there in 100 grams of hydrogen molecules?​

Answer 1

Answer:

$no. \: of \: moles = \frac{no \: of \: particles}{avogadro \: constant =} = \frac{n}{6.022 \times {10}^{23} }$

Here, particles includes atoms as well as molecules.

Given mass=100g

Molar mass of Hydrogen ( H2 ) molecules= 2 g/mol

Thus, No. of moles of Hydrogen = Given mass÷ Molar mass

= 100 ÷ 2

= 50 mol.