A `0.2075 g` sample of an oxide of cobalt on analysis was found to contain `0.1475 g` cobalt. Calculate the empirical formula of the oxide. `(Co = 59 "amu")`

An oxide of iron is found to contain 69.9% iron and 30.1% dioxygen (O_(2)) by mass. Calculate its empirical formula.

If 2.73g of oxide of vanadium contains 1.53g fo the metal vanadium, the empirical formula of the oxide is

A sample of toothpaste weighting 500 g , on analysis was found to contain 0.2 g of fluorine The concentration of fluorine in ppm is

Four gram of copper chloride on analysis was found to contain 1.890g ofcopper (Cu) and 2.110 g of chlorine (Cl). What is the empirical formula of copper chloride ?

0.635 g of a metal gives on oxidation 0.795g g of its oxide. Calculate the equivalent mass of the metal.