## Chemistry and Chemical Reactivity (9th Edition)

Number of moles of permanganate: $34.50\ mL\times 0.108\ M=3.73\ mmol$ From stoichiometry: $9.32\ mmol$ oxalic acid. Number of moles, if A: $1.356\ g/305.00\ g/mol=4.45\ mmol$ Ratio: $9.32/4.45=2.09$ Number of moles, if B: $1.356\ g/437.20\ g/mol=3.10\ mmol$ Ratio: $9.32/3.10=3.00$ Since in B the ratio of oxalates is closer to the stoichiometric ratio in the compound, it's B.