Question

Positive and negative charge in 18 cc of water is how much?

Answer 1

Your question

Positive and negative charge in 18 cc of water is how much?

Your answer

Given

• amount of water = 18 cc = 18 mL
• ( as 1 cc = 1 mL )

Focusing on the given molecule ,

i.e Water ( H2O )

We know that ,

• Total no. of electrons present in water = 10
• i. e. 2 hydrogen atom contains = 2 electrons
• and 1 oxygen atom contains = 8 electrons

So there are 10 electrons.

Now,

For No. of moles of water of water ,

1. Weight / Mass of the given water = Density x volume

• As the density of the water = 1 g/mL and the volume of the water is = 18 mL
• So Weight = 1 x 18 = 18 grams

1. Molecular weight of water (H2O) = 18 g/mol

$\rule{200}{4}$

So , now we can easily calculate the moles of water as we have both the original weight and molecular weight of water.

• No. of moles of water = Weight of water / Molecular weight of water
• = 18 / 18 = 1 mol

As the water have 10 electrons ,

• so no. of moles of electrons in 1 mole of water molecule = 10 x 1 = 10

Now , 1 mol of water contains electrons

• = no. of moles of electrons x Avogadro's number
• = 10 x 6.023 x 10²³
• = 6.023 x 10²⁴

So we have 6.023 x 10²⁴ electrons in 1 mol of water.

Now , we can easily calculate the charge on 1 mole of water or 6.023 x 10²⁴ electrons by multiply it with the official charge on an electron.

i.e

• Total charge on electrons in given water molecule = electron's no. x charge on an electron
• = 6.023 x 10²⁴ x ( - 1.6 x 10^-19 ) C
• = - 9.632 x 10^5 C

And same for the total charge involves protons

• Because water is a stable molecule and the no. of electrons and protons are equal also the charge on an electron and proton is equal So ,

• Charge ( Protons ) = 9.632 x 10^5 C

So the total / net Charge on water molecule

• = 9.632 x 10^5 C + ( -9.632 x 10^5 C )
• = 0 (zero)
• i. e stability / neutrality of Water / H2O molecule

And for this question

• The positive charge present = 9.632 x 10^5 C
• The negative charge present = -9.632 x 10 ^5 C