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