The mass percent of carbon in pure glucose, CH20, is 40.0 percent. A chemist analyzes an impure sample of glucose and determines that the mass percent of carbon is 38.2 percent. Which of the following impurities could account for the low mass percent of carbon in the sample? (A) Water, H2O
(B) Ribose, C, H,Os
(C) Fructose, CH2O, an isomer of glucose
(D) Sucrose, C2H,2011