Answer:
2.11 × 10²³ molecules of octane
Explanation:
Given data:
Mass of octane = 40.088 g
Molecules of octane = ?
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
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
Number of moles of octane:
Number of moles = mass/ molar mass
Number of moles = 40.088 g / 114.23 g/mol
Number of moles = 0.351 mol
Number of molecules:
one mole of octane = 6.022 × 10²³ molecules of octane
0.351 mole of octane = 0.351 × 6.022 × 10²³ molecules of octane
2.11 × 10²³ molecules of octane
