Question

You have a container filled with 46 moles of neutral lithium. How much negative electric charge is contained in the electrons of all the lithium atoms in the container?

Answer 1

1 mole is $6.022*10^{23}$.

We know that lithium atomic number is 3 and it has 1 electron in its outer most shell and 2 in inner shell. So assuming that these electrons will be consider in calculation of total negative charges. So per atom we have 3 electrons.

Total no. of atoms = $46*6.022*10^{23} = 277.012*10^{23}$

Total no. of electrons available in this sample is $3*277.012*10^{23} = 831.036*10^{23}$

Charge on one electron is $-1.602*10^{-19} C$

So net negative charge available in the sample is $831.036*10^{23}*1.602*10^{-19} C = 13313196.72 C$

or, $13.313 Mega Coulomb$answer