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

1 Answer
Jul 23, 2017

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?