What is the mass of 2.8 x 10^22 formula units of Na OH

Mass = 1.85 g

Explanation:

Given data:

Number of formula units = 2.8×10²²

Mass of NaOH = ?

Solution:

1 mole contain 6.022×10²³ formula units

2.8×10²² formula units × 1 mol  /6.022×10²³ formula units

0.46×10⁻¹ mol

0.046 mol

Mass of NaOH:

Mass = number of moles × molar mass

Mass = 0.046 mol × 40 g/mol

Mass = 1.85 g