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Secure https://session.masteringchemistry.com/myctitemview?assignmentproblemID 68620828 Signed in as NASSER ALMAQBALI Chemistry 1013-03 ch Apart2 od Ch7Rat1 Exercise 7,45 -Enhanced with Feedback gures. signi press your answer using Exercise 7.45 Enhanced with Feedback Determine the energy of 1.70 mol of photons for each of the following kinds of light (Assume three significant figures.) E. 239 You may want to reference (Q pages.298-308) Section 72 while completing this problem. My Answers GheUp Incorrect: Try Again; 3 attempts remaining Part C ultraviolet radiation (140 nm) Express your answer using three significant figures. Ga E- 855

Explanation / Answer

Energy(E) = h.c / wavelength {c = 3x108 mps,h=6.628x10-34 js}

E = 3x108 . 6.628x10-34 / wavelength.

E = 19.89 x 10-26/ wavelength.

1mole = 6.022 x 1023 particle

b) visible light (500 nm)

E = 19.89x 10-26 / 500 x10-9 = 3.978 x 10-19 j

energy for 1.70mol = 1.70 x 6.022 x 1023 x  3.978 x 10-19 =4.072 x 105joule

c)ultraviolet radiation (140 nm)

E = 19.89x 10-26 / 140 x10-9 = 0.142 x 10-17 j

energy for 1.70mol = 1.70 x 6.022 x 1023 x  0.142 x 10-17 =1.454 x 106joule

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