Question

How many sodium ions are in 1.4 kg of sodium chloride, NaCl?

Answer 1

1.44 x 10²⁵ ions of Na⁺

Step-by-step explanation:

Given parameters:

Mass of NaCl = 1.4kg = 1400g

Unknown:

Number of ions of sodium = ?

Solution:

The compound NaCl in ionic form can be written as;

NaCl → Na⁺ + Cl⁻

In 1 mole of NaCl we have 1 mole of sodium ions

Now, let us find the number of moles in NaCl;

Number of moles =
`(mass)/(molar mass)`

Molar mass of NaCl = 23 + 35.5 = 58.5g/mol

Number of moles =
`(1400)/(58.5)` = 23.93mol

So;

Since 1 mole of NaCl gives 1 mole of Na⁺

In 23.93 mole of NaCl will give 23.93 mole of Na⁺

1 mole of a substance = 6.02 x 10²³ ions of a substance

23.93 mole of a substance = 6.02 x 10²³ x 23.93

= 1.44 x 10²⁵ ions of Na⁺