Answer to Question #141142 in General Chemistry for Jordan Gant

Question

According to the following balanced reaction, how many moles of HNO3 are formed from 2.50 moles of NO2 if there is plenty of water present?

3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)

Answer 1

Q141142

According to the following balanced reaction, how many moles of HNO₃ are formed from 2.50 moles of NO₂ if there is plenty of water present?

3 NO₂(g) + H₂O(l) → 2 HNO₃ (aq) + NO(g)

Solution:

In the question, we are given 2.50 moles of NO₂ and there is an excess of H₂O, so the ‘moles of HNO₃ ‘ formed will depend on the moles of NO₂.

The given reaction is

3 NO₂(g) + H₂O(l) → 2 HNO₃ (aq) + NO(g)

In the reaction we can see that the mole ratio of NO₂ and HNO₃ is

3 mol NO₂ : 2 mol HNO₃ .

Using this mole ratio we can find the moles of HNO₃ formed from moles of NO₂ .

Moles of HNO₃ formed = 2.50 mol NO₂ * 2 mol HNO₃/ 3 mol NO₂ = 1.6667 mol HNO₃ .

In question we are given 2.50 moles of NO₂ in 3 significant figures, so our final answer must also be in 3 significant figures.

1.6667 mol HNO₃ in 3 significant figure is 1.67 mol HNO₃ .

Hence, 1.67 mol HNO₃ will be formed from given moles of NO₂ and plenty of water.