Question

Number of molecules in 0.5g of H2 gas

Answer 1

2 gm = 1 mole

0.5g= 0.25 mole = 6.023x10^23 x 0.25 = 1.505x 10^23 molecules

Answer 2

Hey !

Solution:

Number of molecules in 1 mole = 6.022 × 10²³ molecules.

So let us first calculate the moles of the substance given.

Given Substance : H₂

Molar Mass of H₂ = 2 × 1 = 2 g

Given Mass = 0.5 g

So Number of moles = Given Mass / Molar Mass

=> Number of moles = 0.5 / 2 = 0.25 moles.

Hence the number of moles in 0.5 g of H₂ is 0.25 moles.

So 1 mole = 6.022 × 10²³ molecules. Then 0.25 moles = x moles

So let the number of molecules be 'x'

We know that Product of Means = Product of Extremes

=> 1 * x = 6.022 × 10²³ / 0.25

=> x = 24.088 × 10²³ molecules.

Hence 24.088 × 10²³ molecules are present in 0.5 g of H₂ gas.

Hope my answer helped !