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how much positive and negative charges are there in a cup of water?

The question you have asked is quite an open ended one. we cannot determine the number of positive charges (protons) and negative charges (electrons) in it unless we are given information about the chemical composition (in terms of elements) of the cup as well as it mass.

The positive charge will be equal to the negative charge in the given system.

but assuming some constants

There are 55 moles of water in a litre, so let's say 20 moles in a glass. No. of molecules=Moles*Avogardo's constant

Molecules=20?(6?1023)=1.2?1025
1 molecule has 1+1+8 electrons. That is, I cup has
1.2?1026
Electrons. The charge on an electron is
1.6?10?19C
So the cup has
1.2?1026?1.6?10?19=1.92?107C
In negative (and positive) charge.


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