Carry out the following operations as if they were calculations of experimental results, and express each answer in the correct units with the correct number of significant figures: (a) 7.310 km ã· 5.70 km (b) (3.26 x 10^-3 mg) - (7.88 x 10^-5 mg) (c) (4.02 x 106 dm) + (7.74 x 107 dm)

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?