Question

64g of CH4 contain -----------
a) 4 mole 24.08
b) 2 mole. 12.04
​

Answer 1

Answer:

Here we will first calculate the number of moles that are present in 64 g of CH4. We know that the molar mass of CH4 is 16 g. This means that there are 6.023 X 1023 molecules of CH4 present in one mole of CH4. Now each molecule of CH4 is made up of one atom of carbon and 4 atoms of hydrogen. There are 6 electrons in an atom of carbon and 1 electron in an atom of hydrogen. Therefore, the number of electrons per molecule of CH4 are

= number of electrons in an atom of carbon + 4 X (number of electrons in an atom of hydrogen)

= 6 + (4 X 1)

= 10

Therefore 1 molecule of CH4 = 10 electrons

So 6.023 X 1023 molecules of CH4 = 10 X 6.023 X 1023 electrons

= 6.023 X 1024 electrons