Engineering Board Exam Reviewer · Chemistry · medium

What is the mass of a single carbon-12 atom?

1. 7.226 × 1024 g
2. 1.993 × 10-23 g
3. 12.000 g
4. 1.661 × 10-24 g

Answer

B. 1.993 × 10-23 g

Solution

m = 12 g/mol 6.022 × 1023 atoms/mol = 1.993 × 10-23 g.

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