please help asap 12 points please give good explanation and describe so i can have a better understanding on how to do this

Find the mass in grams of 1.37x1020 particles of h3po4

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1

How many moles of sulfur dioxide are produced when 4.38 moles of oxygen completely react with iron (iv) sulfide