FNH 200 Study Guide - Final Guide: Paralytic Shellfish Poisoning, Amnesic Shellfish Poisoning, Food Irradiation

(3) Use the vapor pressures for tetrachloromethane given in the following table to estimate the temperature and pressure of the triple point and also the enthalpies of fusion, vaporization and sublimation. Solid 230 225.7 280 340 6440 62501 Liquid 4) Calculate the change in the freezing point of water at 100. and 500. bar compared to that at 1 bar assuming that the density of the liquid and solid phases remain constant at 997 and 917 kg m, respectively. Explain why your answer is positive (or negative). (5) Freeze-drying occurs when vapor (and thus heat) is removed from a liquid Assuming the vapor pressure of H2O remains constant as it cools, estimate the mass of ice that will form as H20 vapors are pulled off of 500.0 g of H2O () starting at 25.0° (6) In vacuum distillation, the surrounding pressure inside a chamber is lowered so the solvent boils at a lower temperature. This is useful when isolating compounds that are temperature sensitive. To what pressure must a chamber be reduced to distill methanol at 25.0°C?

A Snickers bar contains 12 g fat, 33 g carbohydrates, and 4.0 g protein Assuming that the food value of fat, carbohydrates, and protein are 9 0 Cal/g, 4.0 Cal/g. and 4.0 Cal/g, calculate the percentage of the energy that comes from fat. (1 Cal = 4.184 kJ) 3.5% 7.5% 12% 24% 42% A system releases 300 J of heat and has 650 J of work done on its by the surroundings What is the change in the internal energy of the system? +950 +350 -350 +750 -250 Calculate the work done when a gas. at P = 1.0 atm, has a volume change from 22.0 L to V_final = 2.0 L (given 1 L atm = 101.3 J) 2.0 kJ -20 kJ +20 kJ +2.0 kJ -25 kJ A cup of coffee is heated in a microwave oven. It absorbs 40 kJ of energy from the microwave, and the volume slightly increases. Which one of the following statements correctly describes the relationship between the change in enthalpy delta H and the change in internal energy delta E of the coffee? delta H = 40 kJ, delta E 40 kJ delta H 40 kJ, delta E = 40 kJ delta H = 40 kJ, delta E = 40 kJ The heat of vaporization of water at 100 degree C is 40.66 k/mol. Calculate the quantity of heat that is absorbed/released when 5.00 g of steam condenses to liquid water at 100 degree C. 11.3 kJ of heat are absorbed. 11.3 kJ of heat released. 147 kJ of heat absorbed. 147 kJ of heat are released.

Chem 301 Fall, 2017 HW 7 (Due 10/18/17)- Note: You will need to use data from Tables 2C.1- 2C.5 to answer some of these questions. You MUST include a printout of the graph required to do question (8) to receive credit for this Hw (1) The densities of a given solid and liquid of molar mass 122.5 g mol at its normal melting temperature of 427.15 K are 1075 and 1012 kg m, respectively. If the pressure is increased to 120 bar, the melting temperature increases to 429.35 K. Calculate AnsHP and Ass-for this substance (2) Benzenel) has a vapor pressure of 0.1269 bar at 298.15K. Calculate the vapor pressure of CsHs(l) at 340.0 K assuming: (a) that the enthalpy of vaporization does not change with temperature; (b) that the enthalpy of vaporization at temperature T can be calculated from the equation: Δ111pH(T)-4,apa(7,) + &C, (T-%) assuming ACp does not change with temperature (3) Use the vapor pressures for tetrachloromethane given in the following table to estimate the temperature and pressure of the triple point and also the enthalpies of fusion, vaporization and sublimation. Solid 230 225.7 Liquid 280 340 6440 62501 (4) Calculate the change in the freezing point of water at 100. and 500. bar compared to that at 1 bar assuming that the density of the liquid and solid phases remain constant at 997 and 917 kg m, respectively. Explain why your answer is positive (or negative) (5) Freeze-drying occurs when vapor (and thus heat) is removed from a liquid. Assuming the vapor pressure of H2O remains constant as it cools, estimate the mass of ice that will form as H20 vapors are pulled off of 500.0 g of H20 (1) starting at 25.0°C (6) In vacuum distillation, the surrounding pressure inside a chamber is lowered so the solvent boils at a lower temperature. This is useful when isolating compounds that are temperature sensitive. To what pressure must a chamber be reduced to distill methanol at 25.0°C?