Question

To find number of atom in 8g of O2

Answer 1

Number of atoms of oxygen = 1.50  X 10²³

Explanation:

Given

mass = 8 g

number of atom = ??

Solution

1 mole of O2 has molar mass 32 g/ mol

No. of Moles =  mass in grams/ molar mass

No. of Moles = 8 / 32

No. of Moles = 0.25 mol

Number of atoms = No. of Moles  X Avogadro's number

Number of atoms = 0.25 X 6.022 X 10²³

Number of atoms = 1.50  X 10²³