Question

How many molecules of stearic acid are present in 2.00 mL of a 0.25 mM solution of stearic acid?

Answer 1

mM=mol/mL

so, take the product of (0.25mol/mL)*(2 mL) to get mol

then, multiply by Avogadro's number (6.022 x 10^23 molecules/ mol)

Answer 2

3.0E23