Question

Which one has the maximum volume at STP?

A. $8$moles of $H$
B. $1$mole of $C{H_4}$
C. $7$mole of $He$
D. $7.5$mole of ${O_2}$

Answer 1

We know that one mole of substance means $6.022 \times {10^{23}}$ particles. These particles may be ions, electrons, atoms or molecules. It can also be said that the count of particles is referred to as mole.

Complete solution:
At STP (Standard Temperature & Pressure), the volume occupied by $1$ mole of gas is $22.4$ litres.
Also, the number of moles is directly proportional to the volume of gas at STP i.e. greater the number of moles, higher will be the volume of the gas at STP.
Now, it is clear that among the given options, the highest number of moles is highest in case of 8 moles of H. Therefore, 8 moles of H will have maximum volume at STP.

Hence, options (A) 8 mole of H, are the correct option.

Note: Thus, the volume occupied by 1 mole of any gas at STP is termed as standard molar volume. 0-degree Celsius temperature along with 1 atm of pressure is referred to as standard temperature and pressure. At STP, one mole of gas has a volume of 22.4 L. So, greater the number of moles of the gas, higher will be its volume at STP.