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- Chemistry (1) A gas has an equation of state: (P + aP2)(V - b) = RT where a and b are constants. Does this gas have a critical point? Briefly describe why or why notThe diagram below shows some isotherms of water. (a) S Estimate values for the critical constants and the van der Waals constants a and b for this gas. (b) Using the information from part (a), estimate the radius of a water molecule. Compare to the value of 1.37 A obtained from interpolation of ionic radii (Y. Zhang and Z. Xu, American Mineralogist 80 (1995) 670-675). PIMPa C 8 15- 10- M 50 400°C 374°C 350°C 300°C 425°C 450°C 275°C 100 150 200 250 300 350 Vicm mole 400 500Calculate the molar volume of water at 50 ºC and 1 atm, and at 50 ºC and100 atm.Data: ρ50 ºC, 1 atm = 0.98804 g/cm3; κ = 4.4•10-10 Pa-1.
- Which of the following statements are true? Which are false? Why is each true or false? (e) When steam at 100°C in an autoclave is heated to 120°C, the pressure within the autoclave Increase. (f) When using the ideal gas law for calculations, temperature must be in degrees Celsius.(b) A motor car tyre contained a fixed mass of air at 27 °C. Its pressure was 220 k Nm-4 abe atmospheric pressure. After a 60-minute drive, the air pressure rose to 250 k Nm-2 above atmospheric pressure. What was the new temperature of the air in the tyre, in degrees Celsius, if the volume of air remained constant? Note: (Atmospheric pressure = 100 k N m-2)How to compact hydrogen to increase its storage efficiency? FO By the definition, universal gas constant, R, is equal to: R=NA*k where R≈ 8.31 J/(mol K), k 1.38*10-23 J/K is a Boltzman constant, and NA is Avogadro number. In what units NA is expressed At which conditions the property of a real gas approach to the properties of ideal gas? 8 List two main factors (in addition to gas pressure) determining hydrogen storage capacity of gas cylinders for the storage of compressed hydrogen gas. 5 How do you calculate efficiency of a compressor starting from its performances? Which compressor performances are necessary for the calculation? AT
- 3H2(g)+N(g)t>2NH3/g) +Heat owhat is the Keqifthe coscentration atequilibr'um are (H2] =lo01 M: [Nz]= 0.250 M and CNH3]=1.50M? PHow many gramsofnitrogen g as are needect to produce 5OLof ammonia at STP3まらPressure (A) Explain the term pressure and state its S.I. unit. (B) Explain Henry’s law. (C)A bottle of H2 has just been received by the technicians in DkIT for use in the instrumentation lab. It is a 47 litre cylinder at a pressure of 50 atmospheres. The normal working pressures is 2 bar. (i) To what volume of gas will that equate at the working pressure? (ii) For how many hours will the gas last if it used at the rate of 0.5dm3 per hour? D)You see your best friend at the bar and you walk up behind her. You accidentally startle her and she takes a step backwards. Unfortunately, she is wearing high heels and her heels come down on your foot. She weighs only 55kg but the size of her heel is 6mm by 6mm.Determine the pressure that she applies on your foot. (E) If a diver dives to a depth of 35 m what will be: (i) the pressure in Pascals due the water column? (3 marks) (ii) the pressure of the air in…Be sure to answer all parts. and 0₂- (a) Write a balanced equation for the gaseous reaction between N₂O5 and F₂ to form NF3 (b) Determine AGⓇ (c) Find AG rn at 298 K if PN205 - PF₂ = 0.20 atm, PNF3 = 0.25 atm, and Po₂ = 0.50 atm. (a) (b) AGO rxn rxn (c) AGrxn kJ/mol x 10 kJ/mol Enter your answer in scientific notation.
- (a) (c) HO OH 1. BH3 2. H₂O₂, NaOH 3. PCC 4. CH3MgBr 5. H3O+ workup Na₂Cr₂O7 H₂SO4, H₂OQuestions 15 through 17 pertain to the situation described below: An air tank of volume 2.70 x 10-2 m³ has air pressure 7.30 x 106 Pa and temperature 30.0°C inside and is left at a lake bottom at 15.0°C. If there is a leak on the tank and the pressure and temperature inside have dropped to 2.70 × 106 Pa and 11.0°C over a period of time. (15) How many moles of air are in the tank initially? (A) 70.2 mol; (B) 72.2 mol; (C) 74.2 mol; (D) 76.2 mol; (E) 78.2 mol. (16) How many moles of air have leaked out of the tank? (A) 39.3 mol; (B) 41.3 mol; (C) 43.3 mol; (D) 45.3 mol; (E) 47.3 mol. (17) What is the work done by the air leaked into the water? (A) 143 kJ; (B) 133 kJ; (C) 123 kJ; (D) 113 kJ; (E) 103 kJ.Ideal Gas Law The pressure P, temperature T, and volume V ofan ideal gas are related by PV = nRT, where n is the number ofmoles of the gas and R is the universal gas constant. For the pur-poses of this exercise, let nR = 1; therefore, P = T/V.a. Suppose that the volume is held constant and the temperatureincreases by ∆T = 0.05. What is the approximate change inthe pressure? Does the pressure increase or decrease?b. Suppose that the temperature is held constant and the volumeincreases by ∆V = 0.1. What is the approximate change in thepressure? Does the pressure increase or decrease?c. Suppose that the pressure is held constant and the volume in-creases by ∆V = 0.1. What is the approximate change in thetemperature? Does the temperature increase or decrease?