Why does a voltaic cell eventually reach a voltage of 0 if it is used long enough?
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a. the anode has been used up and has no electrons left.
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b. the electrons eventually wear out the wire until it can no longer carry a charge.
c. none of these
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d. the cathode has been used up and has no electrons left.

D. should be the answer

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Explanation:

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g

a electronegativity decreases beacuse the size of nucleus is bigger.