A sample of iron oxide has a mass of 1.596 g. On analysis it was found to contain 1.116 g of iron and 0.48 grams of oxygen. Find the percentage composition of this compound?
69.92% Fe 30.% O
Air is called a mixture because air contain not only one element or one compound; air contain many elements and compounds: nitrogen, oxygen, argon, carbon dioxide, water vapours, helium, neon, krypton xenon, ozone, radon, pollutants. The composition of air was established by chemical analysis; from the second half of the XVIIth century gas after gas were discovered in air.