1. Light with a wavelength of 800 nm has an energy of (a) 2.48 x 10 19 J. (b) 2.
ID: 1069545 • Letter: 1
Question
1. Light with a wavelength of 800 nm has an energy of (a) 2.48 x 10 19 J. (b) 2.48 x 10 28 J. (c) 5.30 x 10 31 J. 2. Light with a frequency of 1.07 x 1015 Hz has a wavenumber (in cm 1) of (a) 3.57 x 106 cm (b) 2.80 x 107 cm 1. (c) 3.57 x 10 cm 3. If a sample transmits 75% of the incident light, it has an absorbance of (a) 0.125. (b) 1.88. (c) -0.125. 4. A liquid sample absorbs light of wavelength 510 nm. The solution will appear (a) green. (b) purple. (c) colorless, 5. A sample in a 1.0 mm cell transmits 75.0% of the incident light at 510 nm. If the solution is 0.075 M, its molar absorptivity (M 1 cm is (a) 1.0 x 10 M cm 1. (b) 1.67 M 1 cm (c) 16.7 M cm 1. 6. A cuvet should be (a) thoroughly rinsed and dried with an absorbent towel before use. (b) rinsed and allowed to drain before use. (c) rinsed and oven dried before use.Explanation / Answer
1)
Normal healthy blood, 7.35
pH = -log[H3O+]
7.35 = -log [H3O+]
[H3O+] = 4.47*10^-8 M
Answer: 4.47*10^-8 M
2)
Diabetic undergoing an acidosis attack, 7.21
pH = -log[H3O+]
7.21 = -log [H3O+]
[H3O+] = 6.17*10^-8 M
Answer: 6.17*10^-8 M
3)
A = 2 - log (%T)
A = 2 - log (75)
= 0.125
Answer: a
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