Answer:
5.54 × 10¹⁷ atoms
Explanation:
Given data:
Mass of sand = 55.2 μg (55.2 ×10⁻⁶ g)
Molar mass of sand = 60 g/mol
Number of atoms = ?
Solution:
Number of moles = mass/ molar mass
Number of moles = 55.2 ×10⁻⁶ g / 60 g/mol
Number of moles = 0.92 × 10⁻⁶ mol
Number of atoms:
one mole = 6.022 × 10²³ atoms
0.92 × 10⁻⁶ mol × 6.022 × 10²³ atoms / 1mol
5.54 × 10¹⁷ atoms
