How many moles of C5H8NO4 are in 453.6 g of C5H8NO4?

Please answer according to the graph in the picture as shown so I can know where to put what. If you write everything down only using words and not letting me know where to put the answers I won't be able to do anything :( So please write everything where it should correspond, thank you!

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.