Given a Cylinder of Fixed Volume Filled with 1 Mol

Multiple Choice

Given a cylinder of fixed volume filled with 1 mol of argon gas, which of the following is correct? (Assume all gases obey the ideal gas law.)

A) If a second mole of argon is added to the cylinder, the ratio T/P will remain constant.
B) If the temperature of the cylinder is changed from 25°C to 50°C, the pressure inside the cylinder will double.
C) A cylinder of identical volume filled with the same pressure of helium must contain more atoms of gas because He has a smaller atomic radius than argon.
D) Two of these are correct.
E) None of these is correct.