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 :


Given:


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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