Black Power Movement essay​

Which element is least likely to undergo a chemical reaction

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.

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?