1. a substance has a volume of 2.6 × 10-1 m3 and a mass of 210 g. determine the density of the sample and express your results in kg/m3 with appropriate scientific notation. make sure to show all work.

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?