Question

How many molecules are equal to 89.23g of calcium oxide

Answer 1

1.593 moles

Step-by-step explanation:

Therefore, 1.593 moles are equal to 89.23 g of calcium oxide.

Answer 2

9.64 × 10²³ molecules

Step-by-step explanation:

Given data:

Mass of calcium oxide = 89.23 g

Number of molecules = ?

Solution:

First of all we will calculate the number of moles of calcium oxide.

Number of moles = mass/molar mass

Number of moles = 89.23 g/ 56.1 g/mol

Number of moles = 1.6 mol

Number of molecules;

1 mole contain 6.022 × 10²³ molecules

1.6 mol × 6.022 × 10²³ molecules / 1mol

9.64 × 10²³ molecules

The number 6.022 × 10²³ is called Avogadro number.