From the periodic table: mass of carbon = 12 grams mass of hydrogen = 1 grams mass of oxygen = 16 grams molar mass of surcose = 12(12) + 22(1) + 11(16) = 342 grams
number of molecules = number of moles x Avogadro's number number of moles = number of molecules / Avogadro's number number of moles = (2.2x10^17) / (6.02x10^23) = 3.6544 x 10^-7 moles
number of moles = mass / molar mass mass = number of moles x molar mass mass = 3.6544 x 10^-7 x 342 = 1.249 x 10^-4 grams = 0.12498 mg