Verified Answer :

olemakpadu

Quantity of Charge , Q = ne
Where n = number of electrons
             e = charge on one electron = -1.6 10 ^-19  C.
             n = 50 10^31  electrons

Q =    (50 10^31)( -1.6 10 ^-19 ) =  -8 10^13 C.

Note that the minus sign indicates that the charge is a negative charge.

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