Question

A 1000 gram sample of NaOH contains 3 moles of
O atoms, what is the % purity of NaOH?
(1) 14%
(2) 100%
(3) 12%
(4) 24%
​

Answer 1

14.47 is the right answer for this

Answer 2

Solution :

The molar mass of Sodium Hydroxide(NaOH) = 40 g/mol

For finding the three moles of sodium hydroxide by multiplying the molar mass with 3.

3 moles of sodium hydroxide(NaOH)

=> 3 × Molar mass of (NaOH)

=> 3 × 40 = 120 grams

.°. 3 moles of (NaOH) = 120 grams

Now,

For finding the purity of sodium hydroxide ( NaOH). So, we have to find the percentage of its purity.

=> 120/1000 × 100

=> 120/10

=> 12%

.°. The % purity of NaOH = 12%