Answer to Question #64713 in General Chemistry for Liliana

Question

I need to solve the following and turn them into their simplest form using mass:
1.) 20.0g of a compound containing only calcium and bromine indicates that 4.00g of calcium are present.
2.) 10.15g of a compound containing only phosphorus and oxygen indicates a phosphorus content of 4.433g.
3.) A compound contains 1.04g K, 0.70g Cr, and 0.86g O.
4.) A compound containing 0.537g Cu and 0.321g F.
5.) A compound containing 9.48g Ba, 1.66g C, 1.93g N

Answer 1

1) The mass of bromine is 20.0 g - 4.0 g = 16.0 g. Thus, a compound contains 0.1 mol of Ca and 0.2 mol of bromine or CaBr2.
2) The mass of oxygen is 10.150 g - 4.433 g = 5.717 g. Thus, a compound contains 0.36 mol of O and 0.14 mol of P or P2O5.
3) A compound contains 0.027 mol of K, 0.013 mol of Cr and 0.054 mol of O or K2CrO4.
4) A compound contains 0.0085 mol of Cu and 0.017 mol F or CuF2.
5) A compound contains 0.069 mol of Ba, 0.138 mol of C and 0.138 mol N or Ba(CN)2.