Three Containers of Equal Volume Are Filled with Three Different

Multiple Choice

Three containers of equal volume are filled with three different gases. The first container is filled with Ar, the second with O2 and the third with CO2. The pressure and temperature of the three gases are the same. Which of the following is true of the gases in the three containers?

A) The number of moles of gas in the containers is the same.
B) The masses of gas in the three containers are the same.
C) The density of gas in the three containers is the same.
D) (a) , (b) , and (c) are all true.
E) None of these are true.