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18/18 x Avagadros number = 6.023 x 1023 molecules of water making the assumption that 1ml of water has 1 g mass. There are 8 electrons in oxygen and 1 from each hydrogen so a water molecule has 10 electrons so 6.023 x 1023 x 10 = 6.023 x 1024 electrons

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because 18ml of H2O = 1 mole of H2O

so. 18ml contains 6.023X1023 atoms and water has 10 electrons

so, 10 e x 6.023 x 1023 = 6.023 x 1024

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13y ago
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11y ago

An illustrative way to solve this problem.

Density water:

1 gram/ml = X grams/1 ml

= 18 grams water

================now, find amount atoms and from experience one sees that this will be Avogadro's number of atoms. 6.022 X 1023 atoms.

total atoms water * molar ratio to get atoms hydrogen. Two hydrogen atoms in compound.

2 * 6.022 X 1023 = 1.204 X 1024 atoms hydrogen, which means

1.204 X 1024 electrons hydrogen

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Q: Calculate number of electrons present in 18mL of water?
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How many moles of water are present in half mole of water?

Your question is irrelevant. I think that you were trying to find the number of molecules present in half a mole of water. 1 mole of water contains 6.023 * 1023 number of molecules. Hence half mole contains half of that number of molecules which is 3.0115*1023.


How does the number of valence electrons change?

There is no simple answer to your question, as your question is too broad and undefined. For simple atoms, the number of valence electrons is the number of electrons in unfilled electron shells, which are then available for bonding to another atom. Oxygen with 8 total electrons has 6 paired electrons in filled electron orbitals, and 2 valence electrons in unfilled orbitals. That is why it forms bonds with 2 hydrogen molecules to form water (H2O) The number of valence electrons can change when you add or remove electrons from an atom, or in more complex atoms where filled orbitals to unfilled orbitals have the same energy and electrons can move from one to another depending on the number of other atoms it is binding with.


Where do plants get their replacement electrons?

They are obtained from water. Photolysis of water release Electrons


How do you calculate the moles of water?

You use the formula concentration x volume to find out the number of moles


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If the water is impure, you could remove the impurities. If the water is pure, it's impossible to decrease the number of molecules without changing the number of water molecules, which would be the only kind of molecules present in that case.

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How many moles of water are present in half mole of water?

Your question is irrelevant. I think that you were trying to find the number of molecules present in half a mole of water. 1 mole of water contains 6.023 * 1023 number of molecules. Hence half mole contains half of that number of molecules which is 3.0115*1023.


How do you calculate the rate of water uptake by a plant?

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How does the number of valence electrons change?

There is no simple answer to your question, as your question is too broad and undefined. For simple atoms, the number of valence electrons is the number of electrons in unfilled electron shells, which are then available for bonding to another atom. Oxygen with 8 total electrons has 6 paired electrons in filled electron orbitals, and 2 valence electrons in unfilled orbitals. That is why it forms bonds with 2 hydrogen molecules to form water (H2O) The number of valence electrons can change when you add or remove electrons from an atom, or in more complex atoms where filled orbitals to unfilled orbitals have the same energy and electrons can move from one to another depending on the number of other atoms it is binding with.