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

im not exactly sure but i think its b!

b.

the accuracy of the data.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.