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Can someone complete these problems? Thank you Will rate

Homework 1: Biophysical Chemistry 1. For a reaction at constant external (usually atmospheric) pressure, show that results in the following relationship Biochemical reactions happen in aqueous solution. Why, in For an ideal gas that expands reversibly from Vi to Vs, show that the work is 2. such a case, can we assume that Buncose canbe oxidized by igniting it irreversibly with a flame or oxidizing it reversibly in the Krebs Cycle. Explain from the First of years of evolution to design all those enzymes. rst Law of Thermodynamics why it is better to do the latter, even though it requires millions of ustrate the point of prob. 4, calculate the heat transfer and work done (in kJ/mol) if 1 mole of gas expands At constant external pressure of I atm b. a. Reversibly In a mitochondria, I nanomole of glucose generates 2 jul of heat and does 3 J of work. What is 6. a. ΔHin kJ/mol? b. w in k/mol? Δ0ìn klmol (not covered yet in this class but you should know from Biochem or Chem 2 ? a) In the desert, hot air in the day time cools dramatically at night. Lets say 400 moles of air (-10,000 Liters) at 37 °C cools down overnight to 15 °C. Given an average heat capacity of dry air as 21 motx is lost? b) Humid air has a higher heat capacity than dry air. Why? c) In a rainforest, which has more humid air, 400 moles of air at 37 °C loses the same amount of heat as in (a). Will the final temperature be higher or lower than 15 °C? You are studying the following biochemical reaction in the laboratory at 40 °C, in aqueous solution at pH 7 how much heat in J +HD You mix 15 ml of 0.100 M GINAc solution with 30 mlL of 0.050 M Serine solution and add I mL of I mg/mL enzyme, all at 40.00 °C. The temperature decreases to 3981°C. a. Is the reaction exothermic or endothermic? b. What is the heat transfer, in J, absorbed or released by the surroundings (the water solvent)? The heat capacity of water is 4.184Y c. You will need to know the total mass of the solvent What is the heat transfer, in J, absorbed or released by the system (the molecules)? d. How many moles are there of the limiting reagent? what is 솨,RXN in kJ/mol? e. The value ofAHRXN for the EXOTHERMIC binding of oxygen to myoglobin is 68 k//mol. If you have 10 mL of l mg/ml apo-myoglobin (apo-myoglobin means protein with no oxygen ligand) (proten MW 16 kDa) at 25 C, and it binds oxygen (oxygen is in excess), what is the final temperature of the solution? The heat capacity of water is 4.184 9·

10. a) Write out the balanced ced combustion reaction for solid -D-fructose, then using the textbook data tables to find fo values for AHy , calculate the value of ARxN for th n reaction. solution) is an e b) Given that the heat of dissolution of solid fructose (AH for dissolving solid fructose into aqueous exothermic 95 kJ/mol and the heats of dissolution of oxygen and carbon dioxide are negligible, c lue of AHRKv for the combustion of fructose in solution (ie, not solid powder fructose). 11 . The value of ΔΗ.n/ nfoilding for the protein azurin is +350 kJ/mol at 82 °C. The heat capacity of folded azurin is 0 and the heat capacity of 12. The heat capacity (C) of solid caffeine is 199 mok ed azurin is 1200-noR what is the value of△Hunfolding for azurin at 25°C? a. Assuming this value is constant, how much heat in J is required to heat 50 grams of caftfeine from 25 to 75 °C? Assumingthe heat capacity at 0 K is zero what is the linear heat capacity polynomial (C, Am for caffeine? You can easily use Excel to calculate a linear equation b c Using your heat capacity polynomial from (b), how much heat in J is required to heat 50 grams of d. caffeine from 25 to 75 °C? What is the percent error in assuming constant heat capacity? 13. The heat of combustion, AH, for the combustion reaction, of solid cyclohexane-di-carboxylic acid (CHCA, molecule shown below) is -3700 kJ/mol. The heat of dissolution of CHCA is-55 kJ/mol. но но a) What is Δ/, of solid CHCA? b) What is AH, of aqueous CHCA (CHCA dissolved in aqueous solution)? 14. Given the information below, calculateow for the oxidation of pyruvate at the physiological temperature for a cat, 39.5 °C MoleculeAH at 298 K (kJ/mol) *k) Pyruvic acid 902 Acetaldehyde -535 CO2 175 140 210 + CO 380 15, The unfolded random-coil peptide SES YINPDGTwTVH can fold into either an α-helix structure with a value of ΔΗ olding of-175 kJ mol or into a β hairpin structure with a ΔΗ@ding of 199 kJ mol. What is the value of AHw for the helix-to-hairpin conformational transition? Drawing pictures like the one I drew on the first day of class may help.

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