answer and explanation
we are given mols, temperature and volume of a gas and we are asked to determine the pressure inside the container.
to do this, we can use the equation:
PV = nRT
and we can rearrange it and make P subject of the formula as follows
P = (nRT)/V
= (3 x 0.0820574 x 400)/60
= 1.64 atm
the pressure inside the container is 1.64 atm
