What is mass? a. the force on an object caused by gravity b. the amount of space that something takes up c. the amount of matter in an object d. how fast something is moving

Equal numbers of moles of he(g), ar(g), and ne(g) are placed in a glass vessel at room temperature. if the vessel has a pinhole-sized leak, which of the following will be true regarding the relative values of the partial pressures of the gases remaining in the vessel after some of the gas mixture has effused?