As we know that, molecular mass of ferric oxide, Fe2O3, is 159.69 grams. Out of which, iron contributes 111.69 g (2 X 55.845 g) and oxygen contributes 48 g (3 X 16 g). Each gram of iron (III) oxide contains 111.69/159.69 g of iron and 48/159.69 g of oxygen. To produce 1000 g iron (III) oxide we need, Iron = 111.69*1000/159.69 = 699.42 g Oxygen = 48*1000/159.69 = 300.58 g
A chair at rest on the floor has two forces acting on it its own weight that pulls it downward and the floor pushing upward on the chair, both of these forces are acting on it but the net force is 0, so the chair remains at rest and its velocity stays at 0.
