A mass of 2.20 kg of sodium phosphate is converted number of moles

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

What causes most sediment to wash or fall into a river

Convert .347 kilometers to miles show your work