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Starting with the formula:

2HNO3 --> H2O + NO2

If you have 0.4 moles of nitric acid (HNO3), you will get half the number of moles of NO2.

So, you will have 0.2 moles of nitric acid.

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Q: How many moles of no2 will be obtained starting with 0.4 moles of nitric acid?
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