Calculate the mole fraction of ethylene glycol (`C_2H_6O_2`) in a solution containing 20% of `C_2H_6O_2` by mass.

Calculate the mole fraction of ethylne glycol (C_(2)H_(6)O_(2)) in a aqueous solution containing 20% of C_(2)H_(6)O_(2) by mass.

Calculate the oxidation number of O in H2O

Calculate the oxidation number of O in H2O

Calculate the oxidation number of C in C2H6

Calculate the molecular mass of C12H22O11

Calculate the mass of 10^20 molecules of H_2O .

Calculate [H_3O^+] of a solution having pH 3.2.