Ammonia gas can be prepared by the following reaction: CaO(s)-2NH4C1(s) → 2NH3(g)--H O(g)-CaCl2(s)
If 324 g of CaO and 648 g of NH4Cl are mixed, the theoretical yield of NH3 is 197 g. If only 138 g of NH3 is actually obtained, what is its percent yield?

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.