How many molecules are 24.7 grams of methane gas?

9.3 * 10²³ molecules

Explanation:

Given dа ta:

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