One milliliter of an unknown liquid contains about 20 drops. One gram of this liquid contains 3.34 x 10^22 molecules. How many molecules are in one drop of the unknown liquid?(density = 1.212g/mL)
Density of the liquid = 1.212 g/mL this means, mass of 1 ml of liquid is 1.212 g 1 ml has 20 drops Hence mass of 20 drops = 1.212 g therefore mass of 1 drop = 1.212 g / 20 = 0.0606 g 1 gram has 3.34 x 10²² molecules. Hence molecules in 0.0606 g = (3.34 x 10²² / 1 g) x 0.0606 g = 2024.04 x 10¹⁸
