Question

Plz explain why. Thank you

6. E Go A plate carries a charge of -3.0 HC, while a rod carries a charge of +2.0 uC. How many electrons must be transferred from the plate to the rod, so that both objects have the same charge? 7. -HINT Water has a mass per mole of 18.0 g/mol, and each water mo- lecule (H,0) has 10 electrons. (a) How many electrons are there in one liter (1.00x 10-m') of water? (b) What is the net charge of all these electrons?

Answer 1

Total Charge = $(-3 +2)\mu c$ = -1 $\mu c$

both object have a charge of -0.50$\muc$$\mu c$ so   -2.50$\muc$$\mu c$ charge will transfer from -3.0 $\mu c$ .

Number of electron transfer :-

q = ne

n= number of electron

e= electronic charge

  $n=\frac{-2.50*10^{-6}}{1.6*10^{-19}} = -1.6*10^{-13}$

Part-b

Avogadro's number is the quantity of representative particles in a mole of a substance. This value is 6.02 x 1023 representative particles per mole. A representative particle is an atom, molecule or electron, to name a few.

(a) $1L*\frac{1000g}{L}*\frac{1mol}{18g}*\frac{6.023*10^{23}molecules}{1mol}*\frac{10electron}{1molecule} =3.34*10^{26} electron$

$Total\, Charge = 3.34*10^{26}electrons*\frac{-1.6*10^{-19}Columb}{electron} \\ = 5.344*10^{8} columb$