How many atoms in 55mg of carbon?

Answer 1

* 1 mole of any element is equal to its atomic weight (on the Periodic Table) in grams.

Equivalencies/Known:

1 mole C = 12.0107g C*

1 mole C = 6.022 x 1023 atoms C

1000mg = 1g

Given:

55mg C

1. Convert 55mg C to grams C.

55mg C x (1g C/1000mg C) = 0.055g C

2. Convert 0.055g C to moles C.

0.055g C x (1mol C/12.0107g C) = 0.0046mol C

3. Convert 0.0046mol C to atoms C.

0.0046mol C x (6.022 x 1023atoms C/1mol C) = 2.8 x 1021atoms C

Answer 2

There are approximately 2.914 x 10^19 carbon atoms in 55 mg of carbon. This calculation is based on the Atomic Mass of carbon and Avogadro's number.