Question

1. A cup contains 250 g of water. Find the number of positive charges present in the cup of water.

(a) 1.34 x 1019 C (b) 1.34 x 107 C (c) 2.43 x 1019 C (d) 2.43 x 107 C Х​

Answer 1

Here You Go. I Hope It Is Sufficient To Your Question.

Answer 2

Mass of water =250g

Molecular mass of water =18g

Number of molecules in 18g of water ==6.02×10²³

Number of moleucles in one cup of water =

250 ×6.02×10²³

18

Each molecule fo water contains two hydrogen atoms and one oxygen atom, i.e., 10 electrons and 10 protons.

∴ Total positive charge present in one cup of water

250 ×6.02×10²³× (10)-¹⁹ = 1.34 × 10⁷C

18

option b is the correct answer