1. Tardigrade
  2. Question
  3. Chemistry
  4. The density of a liquid is 1.2 g/mL. There are 35 drops in 2 mL. The number of molecules in 1 drop is (molecular weight of liquid = 70)

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. The density of a liquid is 1.2 g/mL. There are 35 drops in 2 mL. The number of molecules in 1 drop is (molecular weight of liquid = 70)

Some Basic Concepts of Chemistry

Solution:

Volume of one drop $=\frac{2}{35}mL$
Number of moles in one drop $=\frac{2\times1.2}{35\times70}=\frac{1.2}{\left(35\right)^{2}}$
Number of molecules in one drop $=\frac{1.2}{\left(35\right)^{2}}\times N_{A}$
($N_A =$ Avogadro’s number)