Water has a mass per mole of 18.0 g/mol, and each water mo- lecule (h2o) has 10 electrons. (a) how many electrons are there in one liter (1.00 x 10-3 m) of water? (b) what is the net charge of all these electrons?

Part 1) Number of electrons in 1 liter of water equals

Part 2) Net charge of all the electrons equals

Explanation:

Since we know that the density of water is 1 kilogram per liter thus we infer that mass of 1 liter of water is 1 kilogram hence we need to find electron's in 1 kg of water.

Now since it is given that molar mass of water is 18.0 grams this means that 1 mole of water contains 18 grams of water.

Hence by ratio and proportion number of moles in 1 kg water equals

Now by definition of mole we know that 1 mole of any substance is Avagadro Number of particles.

Hence the no of molecules in 'n' moles of water equals

Now since it is given that each molecule has 10 electron's thus the total number of electrons in n' molecules equals

Part 2)

We know that charge of 1 electron equals the the charge of electrons in 'N' quantity equals

the answer is a)

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