Question

how many moles of H2o are required to produce 4.5 moles of HNO3 according to the following reaction:
3NO2+H2O=2HNO3+NO​

Answer 1

Answer:

2.25 moles

Explanation:

H20 required = 4.5/2 moles

                    =  2.25 moles

Answer 2

Concept:

• The mole concept
• Balancing chemical equations

Given:

• The reaction of nitrogen dioxide and water to produce nitric acid and nitrogen monoxide.
• 3NO₂ + H₂O ----> 2HNO₃ + NO
• The equation is already balanced.
• 4.5 moles of HNO₃ have to be produced

Find:

• The number of moles of H₂O required to give rise to 4.5 moles of HNO₃

Solution:

From the balanced chemical equation, we can see the coefficient of the reactants and products.

3 moles of nitrogen dioxide react with one mole of water to produce 2 moles of nitric acid and one mole of nitrogen monoxide.

We look at nitric acid and water closely.

2 moles of nitric acid are produced from one mole of water.

The number of moles of water required is half that of nitric acid.

We require 4.5 moles of nitric acid.

So the moles of water H2O required are 4.5/2= 2.25

2.25 moles of H₂O are required to form 2.5 moles of HNO₃.

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