Felicity and dawson are conducting an investigation to determine the empirical formula of iron oxide. they start with an 85.65g piece of iron metal and burn it in the air. the mass of the iron oxide produced is 118.37. felicity thinks the empirical formula of iron oxide is fe3o4 and dawson thinks it is if feo. use what you know about how to determine the empirical formula of a compound to provide an argument in support of felicity or dawson.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally