One mole of a substance contains 6.02 x 1023 molecules. The atomic number of Li is 3 and the atomic mass is approximately 7. If you have three moles of Li, how many grams does it weigh?
A. 9
B. 21
C. 7 x 6.02 x 1023
D. 3 x 6.02 x 1023
B. 21
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