Answer:
9.3 × 10²³ molecules
Explanation:
Given data:
Mass of methane = 24.7 g
Number of molecules = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
For 24.7 g methane:
Number of moles = mass/ molar mass
Number of moles = 24.7 g/ 16.04 g/mol
Number of moles = 1.54 mol
1 mole = 6.022 × 10²³ molecules
1.54 × 6.022 × 10²³ molecules
9.3 × 10²³ molecules
