Question

How many moles of helium are in a Superman ballon of volume 8.5 L at 92.3 kPa and 287 K?

Answer 1

Answer : The number of moles of helium are, 0.329 mol.

Explanation :

To calculate the moles of helium gas we are using ideal gas equation.

`PV=nRT`

where,

P = Pressure of
`He` gas = 92.3 kPa = 0.911 atm

V = Volume of
`He` gas = 8.5 L

n = number of moles
`He` = ?

R = Gas constant =
`0.0821L.atm/mol.K`

T = Temperature of
`He` gas = 287 K

Now put all the given values in above equation, we get:

`0.911atm* 8.5L=n* (0.0821L.atm/mol.K)* 287K`

`n=0.329mol`

Thereofore, the number of moles of helium are, 0.329 mol.