Question

12. A 1.42 g sample of helium and an unknown mass of O2 are mixed in a flask at room temperature. The partial pressure of the helium is 42.5 torr, and that of the oxygen is 158 torr. What is the mass of oxygen? 13. Calculate the energy of a photon of electromagnetic radiation whose frequency is 6.75 x 10" s'. Calculate the energy of a photon in kJ/mol of radiation whose wavelength is 322 nm?

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Answer 1

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Partial af O2 Pressure of Oz - male booction & P total 158 = xo2X [158 + 42.5] xor = 158 = 0.788 200.5 Now of males = the = G. W 1. w 1.42 gm = 0.355 чут/ тата Now male poction of the = [I-Xo] And Xo2+ & He=1 - 11 -0.788] = 0.212 не - ма е од на [malls of He att male of Oz] 0.212 = 0.355 - [0.355 + N of Oz / 0.212 (0.355 + n of Oz) = 0.355 000752 6 + on 212 mo2 = 0.355 no2 = 1.32 male Mass of Oz - male x M. W = 10 32 mold X 32 gm = 42. Q 4 mal | Gm So Ans