Q. 94.5( 11 Votes )

Estimate the number of electrons in 100g of water. How much is the total negative charge on these electrons?

Answer :


Mass of water ,

Molar mass of water

Moles of water in 100g of water =

Number of electrons in 1 molecule of water = 2 times one electron each in hydrogen atom + 8 electrons in oxygen atom = 10 electrons


Formulas used:

The relation between molar mass M, mass of sample m and number of moles of sample n is given by:

1 mol of “something” contains NA number of “something”.


Number of electrons in 1 mol of electrons =

Number of electrons in 1 g of water

= 10 electrons × Na ×

Number of electrons in 100 g of water

Negative charge on one electron =

Total negative charge in 100g of water

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