Question

5g of the following gases at 87℃ and 750mm pressure are taken. Which of them have least volume?

1. HF
2. HCl
3. HBr
4. HI

➡ Correct Answer is HI [Option 4]

Explain How???? ​

Answer 1

Answer

4. Hl

At given temperature and pressure , volume of a gas depends upon its number of moles.

volume of gas=number of moles the gas = mass of the gas/ molecular mass of the gas.

because mass of all the gas is same.

Thus

the gas with minimum molecular mass will have the maximum volume.

Here HF has the minimum molecular mass thus its volume will be maximum.

Answer 2

Answer:

HF

Explanation:

volume of a gas =no of moles the gas = mass of the gas /molecular mass of the gas

Thus

the gas with minimum molecular mass will have the maximum volume

Here HF has the minimum molecular mass thus its volume will be maximum