## Chemistry and Chemical Reactivity (9th Edition)

Number of moles of $O$: $(0.452-0.356)\ g\div 15.9994\ g/mol= 6.00\ mmol$, $3.00\ mmol$ of M Atomic weight of M: $0.356\ g\div 0.003\ mol= 118.7\ g/mol$, closest to Sn