First to the question, mass of 6969 molecules of glucose so find the number of moles; 6969/6.022x10^23 = 1.157x10^-20 moles
therefore the mass of 6969 molecules is; 1.57x10^-20 X (6X12.01+12X1.008+6X16) = 2.095x10^-18 g/molecule
and if the question asks for the mass of a cellulose molecule with...