At elevated temperatures sodium chlorate decomposes to produce sodium chloride and oxygen gas. A 0.8513-g sample of impure sodium chlorate was heated until the production of oxygen gas ceased. The oxygen gas collected over water occupied 53.8mL at a temperature of 25°C and a pressure of 733 torr. Compute the mass percent of NaClO3 in the original sample. If at 25°C the vapor pressure of water is 23.8 torr.