Convert 48 g 02 (oxygen gas) to moles of O2* a) 0.75 mol
b) O 3.0 mol
c) 3x10^23 mol
d) 1.5 mol
e) O 1.5 x 10^-23 mol
please help!!

You wish to prepare a buffer consisting of acetic acid and sodium acetate with a total acetic acetate plus acetate concentration of 250 mm and a ph of 5. what concentrations of acetic acid and sodium acetate should you use