Q.

Energy needed to convert 5.75 g Na-atom in gaseous state to form Na+ (g) is:

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a

2829 kJ

b

28.29 kJ

c

123 kJ

d

282.9 kJ

answer is C.

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Detailed Solution

No. of mol of Na          = wt. of Na  At. wt. of Na =5.75g.23g.           =0.25mol. Energy required to convert 1 mol Na to Na+ (g)                =492kJEnergy required to convert 0.25 mol Na to Na+(g)                         =492×0.25kJ=123kJ.
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Energy needed to convert 5.75 g Na-atom in gaseous state to form Na+ (g) is: