Question

Choose the molecular formula of an oxide of iron in which the mass per cent of iron and oxygen are 69.9 and 30.1 respectively and its molecular mass is 160. *​

Answer 1

a pieceof iron ore is found to contain a compound containing 72.3% iron and 27.7% oxygen with molecular mass 231.4 gm/mol. find the molecular formula. Thus, ore contain 167.30 g of iron and 64.1 g of oxygen. Similarly, number of oxygen atom = 64