One molecule of a substance absorbs one quantum of energy. The energy involved when 1.5 mole of the substance absorbs red light of frequency 7.5 × 1014 sec-1will be

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2.99 × 105 J

3.23 × 105 J

4.48 × 105 J

2.99 × 106 J

answer is C.

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Detailed Solution

For one moleculeE = hvFor 1.5 molesE=1.5 × 6.023 × 1023 × hν=1.5 × 6.023 × 1023 × 6.626 × 10−34 × 7.5 × 1014=4.48 × 105 J

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