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CHEM 120 Lecture Notes - Lecture 1: Rate-Determining Step, Capillary Action, Colligative Properties

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4 Apr 2016

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CHEM 120 Full Course Notes

CHEM 120 Full Course Notes

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1 atm/bar=101300 pa: pressure does not depend on the diameter of the column. 1. 01325 bar or 1 bar: when pgas>pbar; pgas=pbar+change in p. Lecture 3: an ideal gas is a gas that obeys the simple gas laws perfectly, boyle"s law: pressure and volume relationship is inversely, charles"s law: temperature and volume relationship is directly proportional. proportional. 273. 15 celsius: absolute zero: any amount of gas volume tend to equal zero at -273. 15 celsius. Absolute temperature is expressed in kelvin, instead of celsius: avogadro"s law: volume and moles relationship is directly proportional. Avogadro: one mole (6. 02 1023) of gas occupy the same volume at stp: 22. 7l: idea gas equation: pv=nrt. R=0. 083145 bar l mol-1 k-1=0. 0821atm l mol-1 k-1: general gas equation: p1v1/n1t1= p2v2/n2t2. Lecture 4: molar mass of a gas: So m=mrt/pv: gas density: depends on t and p d=m/v; d=mp/rt whole numbers, gay-lussac"s law: gases react in volumes proportional to small.

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Related Questions

i need answers of all the 12 questions. plz provide steps as well

A mixture of H_2(g) and NH_3(g) has a volume of 139.0 cm^3 at 0.00 degree C and 1 atm. The mixture is cooled to the temperature of liquid nitrogen, at which ammonia freezes out and the remaining gas is removed from the vessel. Upon warming the vessel to 0.00 degree C and 1 atm, the volume is 77.4 cm^3. Calculate the mole fraction of NH_3 in the original mixture. A vessel contains 1.15 g of H_2O(I) in equilibrium with vapor at 30 degree C. At this temperature, the vapor pressure of H_2O is 31.82 torr. What will the volume be when all the water evaporates at this temperature? A rigid vessel of volume 0.400 m^3 containing H_2 at 21.25 degree C and a pressure of 715 times 10^3 Pa is connected to a second rigid vessel of volume 0.750 m^3 containing Ar at 30.15 degree C at a pressure of 203 times 10^3 Pa. A valve separating the vessels is opened and both are cooled to a temperature of 12.2 degree C. What is the final pressure in the vessels? An electric heater is immersed in a flask containing 150 g of ethanol and a current of 1.12 A is applied from a 12.5 V power supply for 172 s. Estimate the rise in the temperature of ethanol. Consider heating 1 kg of H_2O (i) by 10 degree C using each of the following methods a. Heat with a mechanical eggbeater that is powered by a 1-kg mass on a rope over a pully. How far does the mass have to descent in the earth's gravitational field to supply enough work? b. Make a charcoal fire. How much charcoal (graphite) must you burn? A homeowner uses 4.00 times 10^3 m^3 of methane (at 1.00 atm and 20 degree C) in a year to heat a home. How many grams of methane are used during this time period to heat the home? Consider a sample of a perfect gas whose temperature is -33.0 degree C and volume is 0.0250L. What temperature is required to change the volume to 66.9 cm^3? Hydrogen gas is used in weather balloons because it is less expensive than helium. Assume that 5.57 g of H_2 is used to fill a weather balloon to an initial volume of 67 L at 1.04 atm. If the balloon rises to an altitude where the pressure is 0.047 atm, what is the new volume? Assume that the temperature remains constant. The atmospheric surface pressure on Venus is 90 bar and is composed of 96% CO_2 and approximately 4% various other gases. Given a surface temperature of 730K, what is the mass of CO_2 present per cubic centimeter at the surface? A sample of propane (C_3H_8) is placed in a closed vessel together with an amount of O_2 that is 2.15 times the amount needed to completely oxidize the propane to CO_2 and H_2O at constant temperature. Calculate the mole fraction of each component in the resulting mixture after oxidation, assuming that the H_2O is present as a gas An initial step in the biosynthesis of glucose C_6H_12O_6 is the carboxylation of pyruvic acid CH_3COCOOH(s) to form oxaloacetic acid HOOCCOCH_2COOH: CH_3COCOOH(s) + CO_2(g) rightarrow HOOCCOCH_2COOH(s) What volume of CO_2 is required to produced 1.10 g of glucose? Assume p = 1.00 atm and T = 298 K. In an experiment to measure the molar mass of a gas, 250 cm^3 of the gas was confined to a glass vessel. The pressure was 152 torr at 298 K and the mass of the gas was 33.5 mg. What is the molar mass of the gas?

Part (d) please, explain all steps