6.02 x 10 21 molecules of an unknown substance X has a mass of 2.00 grams. What is the molar mass of X in g/mole?
(A) 0.02 g/mol
(B) 0.2 g/mol
(C) 20 g/mol
(D) 200 g/mol
(E) 2000 g/mol
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