Question

Calculate the number of moles and molecules of 21 g N2 gas. What will be its volume at STP

Answer 1

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The volume of any gas, under any temperature or pressure conditions will depend on the amount of gas you have. STP only identifed the temperature (273 K) and pressure (101.3 kPa).

If you have 1 mole of N2 (or any other gas for that matter) under STP conditions it will occupy a volume of 22.4 L. This is known as the “standard molar volume”.

So, if you know the number of moles of gas that you have, you can use a simple ratio (1 mole : 22.4 L) to determine the volume of the gas.

Answer 2

The volume of any gas, under any temperature or pressure conditions will depend on the amount of gas you have. STP only identifed the temperature (273 K) and pressure (101.3 kPa).

If you have 1 mole of N2 (or any other gas for that matter) under STP conditions it will occupy a volume of 22.4 L. This is known as the “standard molar volume”.

So, if you know the number of moles of gas that you have, you can use a simple ratio (1 mole : 22.4 L) to determine the volume of the gas.