Question

The number of molecules present in 20g of Hydrogen 1) 6.02x10²¹ 2) 6.02x10²¹ 3) 6.02x10²² 4) 6.02x10²¹​

Answer 1

Answer:

The number of molecules present in 20 g of hydrogen is 6.022× $10^{24}$

Explanation:

We know that the molecular weight of hydrogen is 2 g/mol

That is one mole of hydrogen contains an Avogadro number of hydrogen molecules.

2 g of hydrogen   → 6.022 × $10^{23}$ molecules of hydrogen

1 g of hydrogen   → 3.011 × $10^{23}$ molecules of hydrogen

Therefore, 20 g of hydrogen contains 3.011 ×$10^{23}$ × 20 molecules.

That is 6.022 × $10^{24}$ molecules present in 20 g of hydrogen.