CBSE Class 12-science Answered
The number of moles in an elemental sample is just the ratio of the mass m to atomic mass 4.
n=
A
The number of protons N, in an elemental sample is Z (atomic number) times the number of moles of Avogadro's number NA N=ZnN P A Copper has an atomic mass of 63.5 g/mole and 29 protons per atom. If such an atom were neutral, then it would have as many protons as electrons. If you remove electrons from a neutral state, then you get a net positive charge.
Given a 54 gram ball of copper with a net charge of 2.2 µC, what fraction of the copper's electrons have been removed?
Asked by dasrituparna1999 | 12 Apr, 2024, 09:26: PM
Expert Answer
mass of copper ball = 54 gram
1 mole of copper ball = 63.5 gram
number of moles in the copper ball = ( 54/63.5 ) = 0.850
Number of atoms in copper ball is produce of number of moles and Avagadro number N = 6.022 × 1023 .
Number of atoms in copper ball = 0.850 × 6.022 × 1023
If each atom has 29 protons, then number of electrons per atom is 29 .
Total number of electrons in copper ball, Ne = 0.850 × 29 × 6.022 × 1023 ..................... (1)
If the charge on copper ball is 2.2 μC and charge of electron is -1.602 × 10-19 C ,
then number of electrons removed ne is
Fraction of electron removed from copper ball is
Answered by Thiyagarajan K | 12 Apr, 2024, 10:10: PM
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