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Topic: Which reaction releases most energy per mole  (Read 3842 times)

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Offline ferken

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Which reaction releases most energy per mole
« on: April 24, 2009, 10:43:15 PM »
Which of the following processes releases the most energy per mole of ion produced?

A. Na(g) + e -> Na- (g)

B. Na(g) -> Na+(g) + e

C. Cl(g) -> Cl+(g) + e

D. Cl(g) + e -> Cl-(g)

E. S(g) + e -> S-(g)

Can you please explain the answer, thanks in advance =]
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Offline UG

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Re: Which reaction releases most energy per mole
« Reply #1 on: April 24, 2009, 10:47:51 PM »
Are you familiar with ionisation energies and electron affinities?
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Offline ferken

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Re: Which reaction releases most energy per mole
« Reply #2 on: April 24, 2009, 11:07:03 PM »
I actually do understand but i do not understand the difference between

C. Cl(g) -> Cl+(g) + e

D. Cl(g) + e -> Cl-(g)

can u plz explain
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Offline UG

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Re: Which reaction releases most energy per mole
« Reply #3 on: April 24, 2009, 11:11:39 PM »
The first one, a chlorine atom has lost an electron to form Cl+, the second one, a chlorine atom has gained an electron to form a chloride ion, Cl-
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