Consider the statement below. "When nitrogen is liquefied, heat is released." Is this statement true or false? It is false because nitrogen absorbs heat when it is liquefied. It is false because nitrogen cannot absorb enough heat to liquefy. It is true because heat is released when a gas changes to a liquid. It is true because heat is released when a liquid changes to a gas.
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- When you determined the MW of a volatile liiquiid using the Erlenmeyer flask with the aluminum foil cap & the pinhole, explain briefly how you were able to obtain: -Mass of the vapor - Volume of the vapor -Pressure of the vapor - temperature of the vapor B) Calculate the MW of iodethane, a volatile liquid, given the following data obtained from the experiment in 12A, given that PV=nRT (R= 0.0821 L.atm.mol-1.K-1) Mass of residual liquid = 1.6384 g Pressure = 745.6 torr Volume of vapor = 327.8 mL Temp. of vapor = 100.0 CUnder what conditions does the extended Debye-Huckel law, equation 8.52, become the Debye-Hckel limiting law?10.11/ A 1.5-kg specimen of a 90 wt% Pb-10 wt% Sn alloy is heated to 250°C (480°F), at which temperature it is entirely an a-phase solid solution . The alloy is to be melted to the extent that 50% of the speci- men is liquid, the remainder being the a phase. This may be accomplished either by heating the alloy or changing its composi- tion while holding the temperature con- stant. (a) To what temperature must the speci- men be heated? (b) How much tin must be added to the 1.5-kg specimen at 250°C to achieve this state? 10.15) A magnesium-lead alloy of mass 5.5 ka consists of a solid a phase that has a compo- sition that is just slightly below the solubility limit at 200°C (390°F). (a) What mass of lead is in the alloy? (b) If the alloy is heated to 350°C (660°F). how much more lead may be dissolved in the a phase without exceeding the solubility limit of this phase? 10.27 A hypothetical A-B alloy of composition 55 wt% B-45 wt% A at some temperature is found to consist of mass…
- A monolayer of CO molecules is adsorbed on the surface of 1.00 g of an Fe/AI2O3 catalyst at 77 K, the boiling point of liquid nitrogen. Upon warming, the carbon monoxide occupies 4.25 cm3 at O oC and 1.00 bar. What is the surface area of the catalyst?For the dissolution of LiCl in water, ΔHsoln = -37 kJ/mol.Which term would you expect to be the largest negativenumber: ΔHsolvent, ΔHsolute, or ΔHmix?A gas mixture at 300K and 1 bar analyzing by volume 20% N2 and 80% CH4 is subjected to liquefaction at the rate of 1500 kg/hr. It is found that only 30% (weight) of the entering gas is liquefied and the concentration of N2 in the liquid is 60% by weight. The unliquefied gas leaves the unit at 273K and 1 bar. Determine (a) the volume of the unliquefied gas, m3/hr (b) the composition of the gas leaving expressed as volume %.
- Formula: C3H6OMelting Point: -94.0°CBoiling Point: 56.0°CDensity of liquid: 0.791 g/mLHeat of Fusion: 98.14 J/gHeat of vaporization: 538.9 J/gSpecific heat capacity (solid): 1.653 J/g°CSpecific heat capacity (liquid): 2.161 J/g°CSpecific heat capacity (gas): 1.291 J/g°C How much heat is involved in taking 165.2 g of acetone from 14.7°C to 52.1°C?Calculate the wirk done in Joules when 3 moles of water vaporize at 1.0 atm and 100ºC. Assmune the colume of liquid water is negligible compared with that of steam at 100ºC, and ideal gas behavoir. R= 0.0821 Latm/molK.Calculate the ΔHsoln and ΔSsoln for the dissolution of solid KHP from the trendline equation of your scatter graph. Include units. Reffer to equation 4. R is the gas constant 8.314J mol-1 K-1 The trendline equation -5623*x + 17.7 Equation 4 Ln Ksp = - ΔHsoln/R (1/T) + ΔSsoln/ R
- In an experiment carried out at a temperature of 4700C and a pressure of 100 atmosphere, 4.3g of a volatile liquid produced 30.6cm3of the gas. Calculate the molar mass of the liquid. (Molar gas constant, R= 8.314JKmol, molar gas volume at stp = 22400cm3, 1 atmosphere= 1.0 x 10 Nm-2)An experiment was conducted to determine the effect of glucose on the freezing point of water. Experimental data showed thatthe freezing point depression of water in solution was –2.6°C when 1.0 g of glucose was dissolved in 10g of solvent. Calculatethe expected freezing point for such solution and compare the expected freezing point to the value found experimentally. Give aplausible explanation for any discrepancies. (M.W. of glucose= 180.16g/mol; i=1). Show all your work.What is w when 1.83 kg of H20(1), initially at 25.0 °C, is converted into water vapour at 185 °C against a constant external pressure of 1.00 atm? Assume that the vapour behaves ideally and that the density of liquid water is 1.00 g/ml (Remember to include a+or-sign as appropriate.) Enter your answer in acceptable SI units, accurate to 3. significant figures. Use an acceptable Sl symbol for units.