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# Amount of substance substance help! watch

1. Help me with this please and could you explain why you are doing each step!
2. Before any of the calculation, you should know that nitric acid is HNO3 . I'm assuming that you do, but if not this is important to learn, along with hydrochloric acid (HCl) and sulfuric acid (H2SO4).

Since the reaction uses 3NO2, my first step would be 0.543mol ÷ 3 = 0.181mol, which gives us the amount of product we will get overall.
The reaction produces 2HNO3 , so the total amount of it produced is 0.181mol x 2 = 0.362mol. This is the amount of nitric acid produced.
Now we just need to work out the concentration. Convert 250cm3 = 0.25dm3 (1000cm3 = 1dm3) and then use c=n/v to get 0.362mol/0.25dm3 = 1.45moldm-3.

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