How many electrons move past a fixed reference point every tttd = 1.25 psps if the current is iii = 4.8 î¼aî¼a ? the charge on a single electron is about â1.6ã10â19câ1.6ã10â19c .

38 electrons

Explanation:

From Faraday's first law of electrolysis which states that during electrolysis, the mass of a substance deposited at the electrode is proportional to the quantity of electricity passing through it. Mathematically , M ∝ Q

but M = zQ and from electricity, Q =It, hence the equation becomes M = zIt.

where M = Mass of substance deposited in g, and Q =Quantity of electricity in coulombs(C)

I = current in ampere(A)

t = time in seconds

z = Chemical Equivalent in g/C

hence, given t = 1.25 ps and i = 4.8 μA

Using Q = It = 1.25 ps × 4.8 μA , converting the ps (pico secs) to secs and micro ampere to ampere, Q = 1.25 × 10-12s  × 4.8 × 10-6A = 6 × 10-18C

From 1 mole of electron is equal to the quantity of charge which is also equal to 96500C/mol,

Hence, number of moles of electrons =  6 × 10-18C / 96500C/mol

number of moles = 6.218 ×10-5 × 10-18  = 6.218 × 10-23moles

Recalling that, number of moles = number of electrons / Avogadro's constant and Avogardos constant = 6.023 × 10raised to the power of 23/mol

number of electrons = number of moles × 6.023 × 1023/mol

number of electrons = 6.218 × 10-23moles × 6.023 × 1023/mol  = 37.50 which is approximately 38

Hence 38 electrons moved past the fixed reference point.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.