Explain how you would prepare barium sulfate by (a) an acid-base reaction, (b) a precipitation reaction, and (c) a gas forming reaction. Your starting materials are BaCO3, Ba(OH)2, Na2SO4, and H2SO4.

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?