Samples of Oxygen and Helium Have Been Collected in Two

Multiple Choice

Samples of oxygen and helium have been collected in two separate containers of equal volume. Both gases have the same temperature and pressure. Which of the following statements is true?

A) The container of oxygen has the larger number of moles of gas.
B) The container of helium has the larger mass of gas.
C) The container of helium has the larger number of moles of gas.
D) Both containers have the same mass of gas.
E) Both containers have the same number of moles of gas.