# how much positive and negative charge is there in a cup of water

• 4

they must be equal as charge can neither be created nor be destroyed.

• 3

how much positive and negative charge is there in a cup of water

• -1

Assume that one cup holds 250 ml of water.

250 ml = 250 gram of water since its density is 1 in cgs.

number of moles of water in 250 gram = 250 / molar weight of water

n = 250/18 = 13.88 moles

1 mol has 6.022 x 1023 number of water molecules

So 250 g water will have 13.88 x 6.022 x 1023 number of H2O molecules

= 8.36 x 1024 number of molecules

One molecule of water has 2 hydrogen atoms (2 protons) and one oxygen atom (8 protons).

Total protons = 10 = total electrons (since it is neutral)

So 250 g water will have 10 x 8.36 x 1024 = 8.36 x 1025 protons.

charge of proton = 1.6 x 10-19 C

So total positive charge of 250 g water = 1.6 x 10-19 x 8.36 x 1025 = 13.37 x 106 C

which is equal to 13.3 MC (mega coulomb)

So one cup of water has 13.3 mega coulomb positive and negative charge, so that the overall charge is zero.

• 53
why is the assumed volume taken as 250 cc ..?
any specific reason .. ?
• 0
why is the assumed volume taken as 250 cc ..?
any specific reason .. ?
• 0
why is the assumed volume taken as 250 cc ..?
any specific reason .. ?
• 0
why is the assumed volume taken as 250 cc ..?
any specific reason .. ?
• -3
why is the assumed volume taken as 250 cc ..?
any specific reason .. ?
• 3
Why have we taken the amount of water to be taken as 250ml? Any specific reason?
• -1
They have referred the metric cup, which is a unit for measurment of volume. You can find more about it on www.wikipedia.org /Cup_(unit) Fill up the spaces in the url
• 1
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