Twenty liters of NO gas react with excess oxygen. How many liters of NO2 gas are produced if the NO gas reacts completely?

2O L

Explanation:

The balanced chemical equation is 2NO+O  

2

→2NO  

2

Thus, 2 moles of NO will produce 2 moles of NO  

2

.

Also, the volume is directly proportional to the number of moles.

Therefore, 20 L of NO will produce 20×  

2

2

=20 L of NO  

2

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