The osmotic pressure of an aqueous solution at 288 K is 99.0 kPa. Calculate the freezing point of the solution.
01 Apr 2020The normal boiling point of hexane is 69.0°C. Estimate (a) Its enthalpy of vaporization and (b) Its vapour pressure at 25°C and 60°C.
01 Apr 2020The Humphreys series is a group of lines in the spectrum of atomic hydrogen. It begins at 12 368 nm and has been traced to 3281.4 nm. What are the transitions involved? What are the wavelengths of the intermediate transitions?
01 Apr 2020The average coefficient of volume expansion for carbon tetrachloride is 5.81 X 10-4 (°C)-1. If a 50.0-gal steel container is filled completely with carbon tetrachloride when the temperature is 10.0°C, how much will spill over when the temperature rises to 30.0°C?
01 Apr 2020Summarize the role of the immune system in the development of type I diabetes. Propose a strategy that could be used to protect young children from developing an autoimmune reaction, and subsequently type I diabetes, after a viral infection.
01 Apr 2020Suggest the pressure and temperature at which 1.0 mol of (a) H2S, (b) CO2, (c) Ar will be in states that correspond to 1.0 mol Nz at 1.0 atm and 25°e.
01 Apr 2020Sketch the phase diagram of the system NH3/NzH. given that the two substances do not form a compound with each other, that NH3 freezes at -78°C and N2H. freezes at 2°C, and that a eutectic is formed when the mole fraction ofN2H. is 0.07 and that the eutectic melts at -SO°e.
01 Apr 2020Set up a thermodynamic cycle for determining the enthalpy of hydration of Ca2 ions using the following data: enthalpy of sublimation of Ca (s), 178.2 k] mol-1, first and second ionization enthalpies of Ca (g), 589.7 k] mol-1 and 1145 k] mol-1: enthalpy of vaporization of bromine...
01 Apr 2020A sample consisting of2.00 mol of diatomic perfect gas molecules at 250 K is compressed reversibly and adiabatically until its temperature reaches 300 K. Given that CV,m = 27.5 J K-I mol-1, calculate q, w, ∆U, ∆H, and ∆S.
01 Apr 2020A .00 mol CH30H (g) is condensed isothermally and reversibly to liquid at 64oC. The standard enthalpy of vaporization of methanol at 64°C is 35.3 kJ mol-1. Find w, q, ∆U, and ∆H for this process.
01 Apr 2020A .5 mol of perfect gas molecules with Cpm = 20.8) K-1 mol-1 is initially at 230 kPa and 315 K. It undergoes reversible adiabatic expansion until its pressure reaches 170 kPa. Calculate the final volume and temperature and the work done
01 Apr 2020Predict the chemical formulas of the compounds formed by the following pairs of ions: (a) Cr3 and Br- (b) Fe3 and O2- (c) Hg2 2 and CO32- (d) Ca2 and CIO3 (e) NH4 and PO43-.
01 Apr 2020An oscillating at small angles when the length of the pendulum string is shortened at a velocity of a (db/dt = – a). Find Lagrange’s equations of motion.
01 Apr 2020On a cold, dry morning after a frost, the temperature was -5°C and the partial pressure of water in the atmosphere fell to 0.30 kPa. Will the frost sublime? What partial pressure of water would ensure that the frost remained?
01 Apr 2020Molecular bromine is 24 per cent dissociated at 1600 K and 1.00 bar in the equilibrium Br2 (g) = o 2 Br (g). Calculate (a) Kat 25°C, (b) ∆p3, (c) Kat 2000°C given that L3.,H3= 112 k] mol-lover the temperature range.
01 Apr 2020Just 9.00 g of water is placed in a 2.00-L pressure cooker and heated to 500°C. What is the pressure inside the container?
01 Apr 2020If a single disturbance at an unknown distance emits both transverse and longitudinal waves that travel with distinctly different speeds in the medium, such as in the ground during an earthquake, how can the distance to the disturbance be determined?
01 Apr 2020Identify the compound in each of the following pairs that react at the faster rate in an SN1 reaction: (a) Isopropyl bromide or isobutyl bromide (b) Cyclopentyl iodide or 1-methyl cyclopentyl iodide (c) Cyclopentyl bromide or 1-Bromo-2, 2-dimethylpropane (d) tert-Butyl chlori...
01 Apr 2020A glass window pane has an area of 3.00 m2 and a thickness of 0.600 cm. If the temperature difference between its faces is 25.0°C, what is the rate of energy transfer by conduction through the window?
01 Apr 2020Given that μ = 1.11 K atm-I for carbon dioxide, calculate the value of its isothermal Joule- Thomson coefficient. Calculate the energy that must be supplied as heat to maintain a constant temperature when 12.0 mol CO2 flows through a throttle in an isothermal Joule-Thomson experi...
01 Apr 2020A geodesic dome constructed with an aluminum framework is a nearly perfect hemisphere; its diameter measures 55.0 m on a winter day at a temperature of – 15°C. How much more interior space does the dome have in the summer, when the temperature is 35°C?
01 Apr 2020Gaseous Diffusion of Uranium (a) A process called gaseous diffusion is often used to separate isotopes of uranium that is, atoms of the elements that have different masses, such as 235U and 238U. The only gaseous compound of uranium at ordinary temperatures is uranium hexafluori...
01 Apr 2020Gas is contained in an 8.00-L vessel at a temperature of 20.0°C and a pressure of 9.00 atm. (a) Determine the number of moles of gas in the vessel. (b) How many molecules are there in the vessel?
01 Apr 2020A flask with a volume of 1.50 L, provided with a stopcock, contains ethane gas (C2H6) at 300 K and atmospheric pressure (1.013 X l05 Pa). The molar mass of ethane is 30.1 g/mol. The system is warmed to a temperature of 380 K, with the stopcock open to the atmosphere. The stopcock...
01 Apr 2020Evaluate the following preparations in terms of showing microbial size, shape, motility, and differentiation: spore stain, negative stain, simple stain, hanging drop slide, and Gram stain.
01 Apr 2020Estimate the change in the Gibbs energy of 1.0 dm3 of water when the pressure acting on it is increased from 100 kPa to 300 kPa.
01 Apr 2020Two objects, A and B, are connected by hinges to a rigid rod that has a length L. The objects slide along perpendicular guide rails as shown in the figure. Assume object A slides to the left with constant speed v. a) Find the velocity Vg of object B as a function of the angle 8. ...
01 Apr 2020Complete the mechanism and the products for the reaction of 2-pentene with N-bromosuccinimide (NBS) in light and carbon tetrachloride. Use curved arrows, bonds, atoms, and electrons to complete the mechanism and product(s). The first two steps are completed.
01 Apr 2020Gas is contained in an 8.00-L vessel at a temperature of 20.0°C and a pressure of 9.00 atm. (a) Determine the number of moles of gas in the vessel. (b) How many molecules are there in the vessel?
31 Mar 2020A flask with a volume of 1.50 L, provided with a stopcock, contains ethane gas (C2H6) at 300 K and atmospheric pressure (1.013 X l05 Pa). The molar mass of ethane is 30.1 g/mol. The system is warmed to a temperature of 380 K, with the stopcock open to the atmosphere. The stopcock...
31 Mar 2020Example 16.1 (Section 16.1) showed that for sound waves in air with frequency 1000 Hz, a displacement amplitude of 1.2 X 10-8 m produces a pressure amplitude of3.0 X 10-2 Pa. (a) What is the wavelength of these waves? (b) For 1000-Hz waves in air, what displacement amplitude wo...
31 Mar 2020Evaluate the following preparations in terms of showing microbial size, shape, motility, and differentiation: spore stain, negative stain, simple stain, hanging drop slide, and Gram stain.
31 Mar 2020Estimate the change in the Gibbs energy of 1.0 dm3 of water when the pressure acting on it is increased from 100 kPa to 300 kPa.
31 Mar 2020Two objects, A and B, are connected by hinges to a rigid rod that has a length L. The objects slide along perpendicular guide rails as shown in the figure. Assume object A slides to the left with constant speed v. a) Find the velocity Vg of object B as a function of the angle 8. ...
31 Mar 2020Complete the mechanism and the products for the reaction of 2-pentene with N-bromosuccinimide (NBS) in light and carbon tetrachloride. Use curved arrows, bonds, atoms, and electrons to complete the mechanism and product(s). The first two steps are completed.
31 Mar 2020The output voltage of the OP AMP circuit given in the diagram is (please find the attachment for diagram)
31 Mar 2020Ms. Underwood is a 50-year-old female who has come to the local ED after suffering burns from a lawn mower accident. She has burn areas on the right side of her face and head; right shoulder, arm, and hand; and on the right side of her chest wall. She is alert and oriented to per...
31 Mar 2020The current I through a long solenoid with n turns per meter and radius R is changing with time as given by dI/dt. Calculate the induced electric field as a function of distance r from the central axis of the solenoid.
31 Mar 2020The current in a long solenoid of radius 3 cm and 20 turns/cm is varied with time at a rate of 2 A/s. Find the electric field at a distance of 4 cm from the center of the solenoid
31 Mar 2020Convert each of the angle measures from degrees to radians. Round your answers to the correct number of significant figures. (1) 15?
31 Mar 2020How can sentiment analysis be used for brand management?View Solution: How can sentiment analysis be used for brand management
31 Mar 2020EXERCISE 1 (2 MARKS) [R-CODE] Create a new column “quarter” in the data frame fire data that describes the a meteorological quarter of the observation based on the month. Distinguish between the following categories: “Q1”, “Q2”, “Q3”, “Q4”, referring to the four quarters of...
31 Mar 2020A medication order for a TPN solution calls for additives as indicated in the following formula. Using the sources designated below, calculate the amount of each component required in filling the medication order. TPN Solution Formula component source Sodium Chloride 40 mEq 10-mL...
31 Mar 2020KMnO4 reacts with oxalic acid according to the equation given below. Here 20 mL of 0.1 M KMnO4 is equivalent to how many mL and molarity of H2C2O4? 2MnO4– 5C2O4– 16H ? 2Mn1 10CO2 8H2O a) 20 mL of 0.5 M H2C2O4 b) 50 mL of 0.5 M H2C2O4 c) 50 mL of 0.1 M H2C2O4 d) 20 mL of 0.1 M...
31 Mar 2020A body of mass 7 kg moves in the xy-plane in a counterclockwise circular path of radius 9 meters centered at the origin, making one revolution every 13 seconds. At the timet=0,the body is at the rightmost point of the circle. A.Compute the centripetal force acting on the body at...
31 Mar 2020Calculate (a) q when a system does 54 J of work and its energy decreases by 72 J and (b) ? E for a gas that releases 38 J of heat and has 102 J of work done on it.
31 Mar 2020Calculate the energy required to convert 1.70 g of ice originally at –12.0°C into steam at 105°C.
31 Mar 2020Question 1. Half-life of a radioactive sample is 3200 min. How much fraction of the sample is expected to remain after 6400 min? Question 2. The radioactive disintegration of two sample X and Y have decay constant in the ratio of 2:1. If half life of Y is 4 days then after 16 day...
31 Mar 2020Suppose Ginny is an avid reader and buys only comic books. Ginny deposits $3,000 in a bank account that pays an annual nominal interest rate of 10%. Assume this interest rate is fixed—that is, it wont change over time. At the time of her deposit, a comic book is priced at $15.00....
31 Mar 2020Q.1. Element present in chlorophyll (a) Al (b) Cu (c) Mg (d) Mn Q.2. Conversion of ß-D-glucopyranose to a-D-glucopyranose is an example of (a) Mutarotation (b) Anomer (c) Enantiomer (d) Atropoisomer Q.3. Which of the following do not reduces the Fehling’s reagent (a) Glucose...
31 Mar 2020
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