Total atoms in the solid =6×1024 0.005% of atoms lose one electron each. Step 1: Find how many atoms lose an electron Number of affected atoms =(0.005%)×(6×1024) 0.005%=
0.005
100
=5×10−5 ⇒ Number of atoms losing electrons =6×1024×5×10−5=3×1020 Step 2: Each atom loses one electron Each lost electron corresponds to a positive charge gained by the solid equal to the charge of that electron (e=1.6×10−19C). Step 3: Total charge gained Q=(3×1020)×(1.6×10−19) Q=4.8×101=48c
