Does m stand for molality of molarity? You can't get away forever with not using caps. m stands for molality. M stands for molarity. Since you don't use caps to start a sentence we don't know if this is 1/4 m or 1/4 M.
Hydorgen peroxide may be prepared by the following reactions: 2NH4HSO4 ---> H2+(NH4)2S2O8 (NH4)2S2O8+2H2O ----> 2NH4HSo4+H2O2 What mass of ammonium hydrogen sulfate, Nh4HSo4 is initially required to prepare 2.00 mole of H2O2?