Question

How many moles of gas are in a 4.5 meter cylinder at 105K with a pressure of 2.0atm?

Answer 1

`n=1044.53` `mol`

Explanation:

Assuming that the `4.5` `m` you talk about are actually `4.5` `m^3` (so it's the cylinder's volume):

`pV=nRT`

Where:
`p` is the pressure.
`V` is the volum.
`n` is the number of mols.
`R` is the gas constant.
`T` is the temperature.

`2·4.5=n·8.206·10^(-5)·105`

`n=1044.53` `mol`

Note: the gas constant changes with the units you use, if you use `m^3`, `atm`, `K` and `mol`; it is `8.206·10^(-5)`. If not, you must check the value it takes.