How many atoms are in 20.5 mg (miligram) argon.
Express answer in scientific notation

3.09 x 10²⁰ atoms

Explanation:

We want to find the number of atoms in 20.5mg of argon.

We can use dimensional analysis to do so.

See attached image for table.

Needed conversions:

your parents i think this could be it

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.