Which of the following was not a contribution by Niels Bohr?Electrons are in orbits. There is a relationship between the outer s
2 answers:
Answer: The charge of an electron
Explanation:
The charge on electrons was determined by the Robert Millikan and Harvy Fletcher from their experiment named Oil drop experiment.
The charge on the electrons is
Whereas Neil Bohr in his structure of atom explained that:
- Electrons are moving around the nucleus in a discrete circular paths known as orbits or shells.
- These orbitals or shells have fixed value of energy.
- Emission spectra of hydrogen.
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Answer: The mass of lead deposited on the cathode of the battery is 1.523 g.
Explanation:
Given: Current = 62.0 A
Time = 23.0 sec
Formula used to calculate charge is as follows.
where,
Q = charge
I = current
t = time
Substitute the values into above formula as follows.
It is known that 1 mole of a substance tends to deposit a charge of 96500 C. Therefore, number of moles obtained by 1426 C of charge is as follows.
The oxidation state of Pb in is 2. So, moles deposited by Pb is as follows.
It is known that molar mass of lead (Pb) is 207.2 g/mol. Now, mass of lead is calculated as follows.
Thus, we can conclude that the mass of lead deposited on the cathode of the battery is 1.523 g.
Answer: The percent yield of the reaction is 77.0 %
Explanation:
According to stoichiometry:
2 moles of produces = 2 moles of
2.18 moles of is produced by=
of
Mass of =
percent yield =