Question

Calculate the no. Of water molecules in a drop of water present in a volume of 0.05 ml.

Answer 1

Explanation:

Since density of water is 1 gm/cm^3, so 0.05ml of water weighs exactly 0.05g. So, Since, moles = given mass/ molecular mass in grams, Therefore, moles of water here = 0.05/18 = 0.0027777778 (approximately).