You have 1.2 kg of water. One mole of water has a mass of 18.1 g/mole and each m

Question

You have 1.2 kg of water. One mole of water has a mass of 18.1 g/mole and each molecule of water contains 10 electrons since water is H2 O. What is the total electron charge contained in this volume of water? The elementary charge is 1.6

Explanation / Answer

we have 1.2kg i.e 1200 grams of water => 1200/18.1 = 66.298 =~ 66.3 moles of water (approx.) one mole is 6.022x10^23 => 66.3 moles = 66.3 x 6.022x10^23 = 3.992 x 10^25 =~ 4 x 10^25 (approx) molecules of H2O as there are 10 electrons per molecule we have 4 x 10^25 x 10 = 4 x 10^26 electrons 1 eV = 1.6x(10^-19) coulombs => total electron charge contained in this volume of water = 4 x 10^26 x 1.6x(10^-19) = 6.4 x 10^7 C

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