Question

Which of the following samples will have the greatest volume at STP?a. 22 g Neb. 22 g Hec. 22 g O2d. 22 g Cl2e. All of these samples would have the same volume at STP.

Answer 1

He

Step-by-step explanation:

According to Avogadro's law, at constant pressure and temperature, the volume of the gas is directly proportional to the moles of the gas.

Thus,

Moles of
`Ne`:-

Mass of the gas = 22 g

Molar mass of Ne = 20.1797 g/mol

The formula for the calculation of moles is shown below:

`moles = (Mass\ taken)/(Molar\ mass)`

Thus,

`Moles= (22\ g)/(20.1797\ g/mol)`

`Moles_(Ne)= 1.0902\ mol`

Moles of
`He`:-

Mass of the gas = 22 g

Molar mass of He = 4.002602 g/mol

`Moles= (22\ g)/(4.002602\ g/mol)`

`Moles_(He)= 5.49642\ mol`

Moles of
`O_2`:-

Mass of the gas = 22 g

Molar mass of
`O_2` = 31.998 g/mol

`Moles= (22\ g)/(31.998\ g/mol)`

`Moles_(O_2)= 0.68754\ mol`

Moles of
`Cl_2`:-

Mass of the gas = 22 g

Molar mass of
`Cl_2` = 70.906 g/mol

`Moles= (22\ g)/(70.906\ g/mol)`

`Moles_(Cl_2)= 0.31026\ mol`

Thus, more the number of moles, more the volume. Thus, He will have the greatest volume at STP.