Question

Sodium hydroxide, NaOH, is a strong base that is used in industrial synthesis and processes such as making paper.

What is the mass of 2.70 ×1022 formula units of NaOH (Molar mass = 40.0 g/mol)?

Answer 1

1.792 g

Step-by-step explanation:

We are given;

• Formula units of NaOH as 2.70 ×10^22
• Molar mass of NaOH as 40.0 g/mol

We are required to determine the mass of NaOH in the given formula units;

Step 1: Determine the number of moles of NaOH

• We need to know that 1 mole of a compound contains formula units equivalent to the Avogadro's number, 6.022 × 10^23.

• Therefore;

1 mole of NaOH = 6.022 × 10^23 formula units

• Thus;

Moles of NaOH = 2.70 ×10^22 ÷ 6.022 × 10^23 formula units/mol

= 0.0448 moles

Step 2: Determine the mass of NaOH

Moles = mass ÷ Molar mass

Therefore,

Mass = Moles × Molar mass

= 0.0448 moles × 40.0 g/mol

= 1.792 g

Thus, the mass of 2.70 × 10^22 formula units of NaOH is 1.792 g