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Question
The ionization enthalpies of lithium and sodium are 520 kJ/mole and 495 kJ/mole respectively. The energies required to convert all the atoms present in 7 mg of lithium vapours and 23 mg of sodium vapours to their respective gaseous cations respectively are?
The ionization enthalpies of lithium and sodium are 520 kJ/mole and 495 kJ/mole respectively. The energies required to convert all the atoms present in 7 mg of lithium vapours and 23 mg of sodium vapours to their respective gaseous cations respectively are?
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Solution
The correct option is B 520 J, 495 J
Number of moles of Li = 7×10−37 = 10−3
Number of moles of Na = 23×10−323 = 10−3
The amount of energy required for 1 mole of Li = 520 kJ.
For 10−3 of Li = 250 × 10−3 = 520 J
The amount of energy required for 1 mole of Na = 495 kJ.
For 10−3 of Na = 495 × 10−3 = 495 J
520 J, 495 J
Number of moles of Li = 7×10−37 = 10−3
Number of moles of Na = 23×10−323 = 10−3
The amount of energy required for 1 mole of Li = 520 kJ.
For 10−3 of Li = 250 × 10−3 = 520 J
The amount of energy required for 1 mole of Na = 495 kJ.
For 10−3 of Na = 495 × 10−3 = 495 J
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