## Chemistry and Chemical Reactivity (9th Edition)

Number of moles of potassium dichromate: $2.335\ g\div 294.185\ g/mol=0.00794\ mol$ Concentration: $0.00794\ mol/0.500\ L=0.0159\ M$ For the ions, from stoichiometry: $K^+$: $0.0317\ M$ $Cr_2O_7^{2-}$: $0.0159\ M$