## Chemistry and Chemical Reactivity (9th Edition)

$0.592\ g$
The number of moles of ions: $0.100\ m\times 0.125\ kg=0.0125\ mol$ The number of moles of Na2SO4: $0.0125\ mol\div 3=0.0042\ mol$ Mass of Na2SO4: $0.0042\ mol\times 142.04\ g/mol=0.592\ g$