A chemist mixes an excess of oxygen gas with 5.25g of sodium according to the balanced chemical reaction 4Na+O2->2Na2O. What is the maximum amount of sodium oxide that can be made?

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.