Question

How many atoms are in 20.34 grams of aluminum (Al)

A) 6.02 x 10^23 atoms
B) 4.54 x 10^23 atoms
C) 4.54 atoms
D) 548.8 grams

Answer 1

Option A: 6.03 * 10^23 atoms

Answer 2

Notice that the value 12.01 grams of natural carbon is the same as the atomic mass value (12.01 amu). It also tells us that 20.34 grams of aluminum contains exactly 6.022 x 1023 atoms of aluminum.

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So, the answer is A) 6.02 x 10^23 atoms

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