An object has an excess charge of -1.92x10^-7 C.How many excess electrons does it have?

Dear student

Charge = charge of one electron * number of electrons
-1.92*10^(-7)= n (-1.6*10^(-19)

n= 1.2*10^12 electrons

Regards

Approved

This object has a charge of −1.92⋅10−7 C.

Remember that electrons (e−) have a charge of −1.602⋅10−19 C. So here, there exist: -1.92 * 10^-7 / – 1.6 * 10^-19 = 1.2*10¹²

Approved