Question

when 0.28g of iron fillings were heated in a current of dry air, gave 0.40g of iron oxide(Fe2O3). find the weight of wxygen that combines with this weight of metal with the help of the law of conservation of mass.​

Answer 1

Answer:

Weight of oxygen is 0.12 grams

Explanation:

Iron  +  Arr   ⇒    Iron oxide

0.28     xgr                0.40gr

According to Law of conservation of mass

Total mass of Reactants=Total mass of products

                         0.28+x=0.40

                          x=0.40-0.28

                     x=0.12grams

therefore; Weight of oxygen=0.12grams