Answer to Question #223526 in General Chemistry for jojo

Question

A 45.41 gram sample of chromium is heated in the presence of excess oxygen. A metal oxide is formed with a mass of 66.36 g. Determine the empirical formula of the metal oxide.

Answer 1

Mass of Chromium = 45.41

Molar Mass of Chromium = 51.9961

= 0.8733 mol

Molar Mass of Oxygen = 15.999

= 66.35-45.41/15.999 = 1.3344

The ratio between

Chromium and Oxygen is2:3.So, the empirical formula is therefore Cr2O3