Concise Physical Chemistry

c21 JWBS043-Rogers September 13, 2010 11:30 Printer Name: Yet to Come

PROBLEMS AND EXAMPLES 359

Problem 21.7

Irradiation of a gaseous sample of acetone(g) by light of 313 nm brings about pho-

tochemical dissociation to give ethane(g) and CO(g). If, in an experimental run, the

total radiant energy was 200 J and 9. 00 × 10 −^5 moles of acetone dissociated, what

was the quantum yield?

Problem 21.8

Part of chemical folklore is that heating a reaction by 10 degrees doubles the rate.

If this is true, what is the activation energy for the temperature change from 298 to

308 K? Is this rule generally true?