Question

What molar quantity of dinitrogen gas is present in a `300*mL` volume under standard conditions of temperature and pressure?

Answer 1

Volume is a state function, of number of gaseous molecules......I gets approx. `0.01*mol`.

Explanation:

....and the pressure of those molecules, .......and the temperature of those molecules.........I will use `"STP"` as `105*kPa` and a temperature of `0` `""^@C`, i.e. `273.15*K`.

We use of course employ the Ideal Gas equation.........and the only difficulty is in finding the appropriate gas constant, `R`. This site lists the various gas constants, including the one I use here.

`R=8.3144598(48)xx10^-2*L*"bar"*K^-1*mol^-1`

`n=(PV)/(RT)=(1*"bar"xx300*mLxx10^-3*L*mL^-1)/(8.31xx10^-2*(L*"bar")/(K*mol)xx273.15*K)`

`=0.0132*mol` of `"dinitrogen gas"`. What is the mass of this gas?