C12H22O11(aq)+H2O(g)->4C2H5OH(l)+4CO2(g) Find the theoretical yield and the percent yields of ethanol if 680.g sucrose undergoes fermentation and 303.5g ethanol is obtained.

Answer 1

First, find the theo yield of ethanol from the stoichiometric equation as follows:

(46.0 g ethanol/1 mol ethanol) (4 mol ethanol/1 mol sucrose) (1 mol sucrose/342.2 g sucrose) 680. g sucrose

= 365.6 g ethanol. This is the theoretical yield

% Yiels = (actual yield/theo yield) x 100 = (305.5 g/365.6 g) x 100 = 83.0 %