Question

how many molecules are present in 0.2g of hydrogen gas​

Answer 1

Answer:

1 mole of hydrogen gas contains 6.02×10  

23  atoms.

1 molecule of hydrogen(H  2  ) contains two atoms of hydrogen.

∴ 1 gm of hydrogen contains  

2 1×6.02×10  

23  =3.01×10  23

 molecules.

Explanation:

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Answer 2

Explanation:

No. of Molecules

= $\frac{Given \: \: Mass}{Molar \: Mass} \times Avogardo \: Number$

Atomic mass of Hydrogen = 1u

Molar mass of H molecules = 1g

=> N =

$\frac{0.2}{1} \times 6.022 \times {10}^{23}$

=> N = 1.2044 × 10²³