An impure sample of solid sodium nitrate, NaNO3, was heated so that it decomposed as in the equation:
2 NaNO3(s) -> 2 NaNO2(s) +O2(g). Heating a .1865-g sample of impureNaNO3 formed 24.6 mL of O2 gas, collected by the water displacement, at the 26.00C and a barometric pressure of 737.5 mm Hg. Determine the percentage of NaNO3 in the sample?