Question

How would I calculate "Avagadro's number" from the given data?

"Avagadro's number" is in quotes because it is experimental data being delt with.

Area of specimen = 41. 28 cm²

Area of molecule = 2.01 x 10^-15 cm²/molecule

Formula Weight = 284.5 g/mol

1 mL of liquid= 48 drops

Diluted solution used 0.0265 g of steric acid.

Thank you in advance!

Update: 1 drop was used in the experiment. so 1/48th of a mL.

Answer 1

According to Avagadro 1 mole of a substance contains 6.0023 * 10²³ atoms or molecules.

From the above given data 1mL of the solution contains 0.0265g of steric acid. For the experiment 1/48th of a mL is used which contains 0.0265/48= 0.00055g of steric acid.

No. of moles of steric acid= weight/Gram molecular weight

= 0.00055/284.5

= 0.0000019 moles

The Avagadro number is given by multiplying the number of moles with the factor 6.022 * 10²³ which equals 1.16 * 10¹⁸