When Ca(OH)2 is dissolved in water, it is known that the enthalpy of solution (AHsoln) is -16.2 kJ/mol.Determine the change in temperature, in °C, that would be measured in a coffee-cup calorimeter when 54 g of calcium hydroxide is added to 5000.0 mL of water.Comment: The experiment is done at low concentration so you can neglect the mass of the reactant in the calculation of qH2o-Given: specific heat capacity of water = 4.186 J/g°C; density of water = 1.00 g/mL; molar mass of calcium hydroxide =74.093 g/molEnter the numerical value only, using 2 sig figs. Remember to include the sign for negative values.

Given data: Enthalpy of solution = -16.2 kJ/mol Mass of calcium hydroxide = 54 g Volume of water =…

Answered: When Ca(OH)2 is dissolved in water, it…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Biochar is believed to be a good absorbent for various contaminants. In an isotherm experiment, a series of 20 mL polyethylene centrifuge tubes containing nutrient (NH4Cl) solutions (Volume: 12 mL, pH adjusted to 7.0 ± 0.2) with NH4+-N concentrations of 60, 120, 180, 240, or 480 mg/L and 200 mg of switchgrass biochar samples (sealed with Telflon-line screw caps) were agitated on a wrist action shaker for 24 h (pre-examined to be sufficient) to reach equilibrium. The concentrations of NH4+-N at equilibrium are summarized in the table below. Initial NH4+-N concentration (mg/L) NH4+-N concentration at equilibrium (mg/L) 60 54 120 110 180 165 240 228 480 471 Please use the Freundlich isotherm model to estimate the adsorption constant values of switchgrass biochar.
A solution is prepared by dissolving iodine, I2, in carbon tetrachloride , CCl4, at 25 °C. For a solute of molality 0.100 mol kg−1, calculate the change in the chemical potential of the solvent caused by the solute. (c) change of chemical potential (solvent) = __________ J/mol. 3 sig. fig. R = 8.3145 J/Kmol.
2000 kg of salt solution containing 30% salt are heated to evaporate a part of H2O and then cooled to 20 ° C to crystallize the salt. If 50% of dissolved salt in the original solution is to be crystallized out, calculate: (i) The weight of water to be evaporated and (ii) The weight of mother liquor left after crystallization. Data: Solubility of salt at 20 ° C = 36g / 100g water.
A saturated vapor feed that is 90 %mol maleic anhydride and 10%mol benzoic acid is distilled at 99.8 torr to give a distillate that is 99.5 %mol maleic anhydride and a bottoms that is 0.5 %mol maleic anhydride. How many equilibrium stages are needed using a reflux ratio that is 1.6 times the minimum? The solution is ideal in both vapor and liquid stages. Vapor pressures can be estimated with the following Antoine equations in °C and torr: Maleic anhydride: ?(saturation)= exp (16.6541 − 4.088.12/(T+203.924)) Benzoic acid: ?(saturation)= exp (23.0155 − 9336.97/(T+321.434)
The partition coefficient (Kp) for caffeine in dichloromethane is 5.2 You have an aqueous solution of caffeine (80 mg) in 30 mL of water. Calculate the amount (in mg) of caffeine that can be extracted with 1 portion of 30 mL of dichloromethane (i.e. how much caffeine will be in dichloromethane). Write your answer in the form (xx.x mg)
A solution containing sodium fluoride is mixed with a solution containing cadmium nitrate to form a solution that is 0.0050 M in NaF and O.00250 M in Cd(NO3)2. If the Ksp for CDF2 is 6.44x10-3, then Q > K and a precipitate of CDF2 will form. O Q < K and more CDF2 will precipitate since the solution is not supersaturated. O Q < K and CdF2 does not precipitate. Q = K and the system is at equilibrium.
4. Solid bismuth (II) oxide and solid carbon react to form bismuth metal and carbon monoxide gas. Write a balanced chemical equation for this reaction and calculate the theoretical mass (in grams) of bismuth metal that can be produced by reacting 468.698 grams of each reactant.
An inlet water solution of 800kg/h containing 12.0 wt % acetone is extracted with the solvent trichloroethane containing 0.5 wt % acetone in a countercurrent tray tower at 250C. The trichloroethane is essentially immiscible with water up to a concentration of acetone in water of 27 wt %. The exit concentration in the water stream is set at 1.0 wt % acetone. The equilibrium data is tabulated in Table 1. Table 1: The equilibrium data 0.0196 0.0467 0.0741 0.0909 0.0120 0.0294 0.0462 0.0571 0.0833 0.1081 0.1316 0.1304 0.1666 0.2000 a) Determine the minimum solvent rate needed for this extraction. b) Using 1.5 time the minimum rate, graphically determine the number of theoretical steps needed in the process. c) Calculate theoretical step using analytical equation d) For a packed tower with this sytem, the height of the transfer unit HoL has been estimated as 0.9m. calculate the number of transfer units NoL and the tower height in this process.
Please use SI units and state which corellation is used
For Chemical Engineering please solve ASAP and correctly If the atmospheric CO2(g) concentration is 500 ppm, calculate the pH of the river water and the concentration of Ca2+ in mol/L.
3a
can you help me solve this, this is what i have so far but is there a different way of doing this. please type solution in word. calculate how much KNO3 can be removed as solid (filtered) from a 1-kilogram solution of 60 wt% KNO3 in water (40 wt%) at 65 °C, when it is cooled to 25 °C. Note that the 60 wt% value is given on a basis of total solution mass, which is different than the values presented in the graph.

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