How many number of electrons in 1/4 kg of w ater
Answers
Answer:
What is the total charge of all the electrons in 1.0 kg of H2O?
Let's see...
The molar mass of an H2O molecule is 2×1+1×16=18 grams
The total number of electrons per H2O molecule is 2×1+1×8=10
The number of moles of H2O in 1 kg of water is 1000/18=55.555...
The number of molecules of H2O in 1 kg of water is 55.555...×6.022×1023=3.3455...×1025
Therefore, the number of electrons in 1 kg of water is 3.3455...×1025×10=3.3455...×1026
Finally, the total charge of those electrons is 3.3455...×1026×−1.602176×10−19=−5.360169×107 Coulombs.
For those that don't know, the number 6.022×1023 is the and the number −1.602176×10−19 is the charge of one in Coulombs.
Each water molecule has 10 electrons, so multiply that answer by 10 to get the total number of electrons, 3.34 x 10^27 electrons per kg water. Finally, multiply the number of electrons by the energy per electron (1.602 x 10^-19 coulombs). 3.34 x 10^27 electrons x 1.602 x 10^-19 coulombs/electron = 5.29 x 10^8 coulombs.