Week 5, Text Exercises, Part IV - Text Exercises Part IV...

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Unformatted text preview: Text Exercises, Part IV . Exercise 82 in Ch. 17 A layer of peat beneath the glacial sediments of the last ice age‘had a carbon-14 content of 25% of that found in living organisms. How long ago was this ice age? Answer: k = 0.693 1' 5720 years = 1.21 x 10-4Iyear log X0 / X = [(1.21 x 10-4fyear] x T112311 X = 0.25 X0, so log X0 1’ X =10g 1.0001025 = log 4 == 0.602 Therefore, 0.602 = [(1.21 x 10-4/year) x T] 1' 2.30. .1 = 11,444 years - Exercise 86 in Ch. 18 Based on its functional group. match the structure on the left with the correct name on the right. 0 H R‘ C" CH- => Carboxylic acid R——OH => Alcohol 0 R-E - OR => Ester R—O—R =>Ether . Exercise 114 in Ch. 18 How many kilograms of CO; are produced by the complete combustion of 3.8 kg of n-octane? Hint: Begin by writing a balanced equation for the combustion of n-octane. Answer: 2 C8H18 + 25 02 —> 16 CO2 + 181120 (3.8 kg C8H18) / (114.2293 g C8H18/mol) x (16/2) x (44.0096 g (302111101) = 12 kg (:02 . Exercise 94 in Ch. 19 A hemoglobin subchain contains 146 amino acids. How many DNA base pairs are required to code for all the amino acids in the subchain? Answer: 3 base pairs code each amino acid, for a total of 3*146 = 438 base pairs. ...
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