Problem #0014 Electricity & Magnetism Sub-menu Problem #0016 Chapters Chapters

285.

Problem 27.31 (RHK)

We have to calculate the number of coulombs of positive charge in a glass of water. We may assume that the volume of water in the glass is .

Solution:             Click For PDF Version

Mass of of water will be 250 g. Amount of positive charge in each molecule of water, , is , as number of protons in a molecule are 2+8.

The number of molecules in 18 g of water are equal to the Avogadro’s number, . Therefore, the number of molecules in 250 g of water will be

Therefore, the total positive charge in coulombs in of water will be