Sodium (Na) reacts with nitrogen gas (N2) to produce sodium nitride. If a student collects 2.5 moles of sodium nitride (NaN3) after the reaction has been completed, determine the number of moles of nitrogen that were initially present.

2Na + 3N2 -> 2NaN3

Your

3.75 mole N2

1.2 mole N2

3.87 mole N2

Answer : The correct option is, 3.75 mole

Explanation : Given,

Moles of = 2.5 mol

The balanced chemical equation is:

From the balanced reaction we conclude that

As, 2 moles of produce from 3 moles of

So, 2.5 moles of produce from moles of

Therefore, the moles of initially present was, 3.75 moles.

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