In: Chemistry
a 15.04 gram sample of chromium is heated in the
presence of excess iodine. a metal iodide is formed with a mass of
125.2g. determine the empirical formula of the metal
iodide
mass of Cr = 15.04 g
molar mass of Cr = 51.96 g / mol
moles of Cr = mass / molar mass
= 15.04 / 51.96
= 0.290
mass of Iodine = 125.2 - 15.04
= 110.14 g
moles of I = mass / molar mass
= 110.4 / 126.9
=0.868
moles ratio = Cr : I
= 0.290 : 0.868
= 1 : 3
empirical formula = CrI3 (chromium (III) iodide)