Question

There are 1.204 x 10^24 molecules of H2, in a sample. How many moles does this

represent?
2.00 moles
4.00moles
10.0moles
20.0moles ​

Answer 1

2 moles

Step-by-step explanation:

Given data:

Number of molecules = 1.24 × 10²⁴

Number of moles = ?

Solution:

To solve this problem we will use the Avogadro number.

The number 6.022×10²³ is called Avogadro number and it is the number of atoms in one mole of substance or number molecules in one mole of compound.

While we have to find the mole of hydrogen in 1.24 × 10²⁴ molecules.

2 g of H₂ = 1 mole of H₂ = 6.022×10²³ molecules

For 1.24 × 10²⁴ molecules:

1.24 × 10²⁴/ 6.022×10²³ = 2 moles