Question

A spoon of table salt, NaCl contains 12.5grams of this salt. Calculate the number of moles it contains.

Answer 1

Answer:

• Given Compound= NaCl

• Molar mass of Na = 23 g/mole

• Molar mass of Cl = 35.45 g/mole

• Given mass of compound = 12.5 g

★ Molar mass of compound:

=> M = m₁ + m₂

=> M = 23+ 35.45

=> M = 58.45 g/mole

★ Number of moles:

=> n = (Given mass)/(molar mass)

=> n = (12.5)/(58.45)

=> n = 0.213 moles