How much energy is required to heat 1.50 moles of dichloromethane (CH3Cl2) from 30 °C to 60 °C? The boiling point of dichloromethane is 40 °C and the enthalpy of vaporization is 29.03 kJ/mol.
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How much energy is required to heat 1.50 moles of dichloromethane (CH3Cl2) from 30 °C to 60 °C? The boiling point of dichloromethane is 40 °C and the enthalpy of vaporization is 29.03 kJ/mol.
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- Determine the amount of heat, in kJ, required to heat 100.0 g of liquid Ca at 851C to 951C.Melting Point = 851C Boiling Point = 1487CMolar Heat CapacitiesC = 26.2 J/molCC = 31.0 J/molCΔH = 9.33 kJ/molΔH = 162 kJ/molnormal boiling point of C2Cl3F3 (MW=187.4) is 47.6oC. The specific heats for the liquid and gas are 0.91 J/gK and 0.67 J/gK, respectively. Calculate the heat required to convert 25.0 g of C2Cl3F3 from a liquid at 5.00oC to a gas at 82.00oC if ΔvapH = 27.49 kJ/mol.Fatty acid mixtures can be used as drug release systems by taking advantage of the different thermal properties of the mixture when compared to those of the pure substances. A mixture of two fatty acids, myristic acid (MA) + stearic acid (SA), exhibits the following (experimentally determined) phase diagram. Sketch a cooling curve for 40% MA over the temperature range of 68 to 40 o Each time the slope of cooling curve changes, label the approximate temperature, as well as the components and phase (or phases) present in that region of the curve.
- The ΔH°soln of HNO3 is –33.3 kJ/mol. 11.0 mL of 14.0 M HNO3 is dissolved in 100.0 mL of distilled water initially at 25°C. How much ice at 0°C [cP = 37.1 J/(mol ·°C), ΔH°fus = 6.01 kJ/mol] must be added to return the solution temperature to 25°C after dissolution of the acid and equilibrium with the ice is reached? The molar heat capacity is 80.8 J/(mol·°C) for the solution, and the molar heat capacity is 75.3 J/(mol·°C) for pure water.How much energy is removed when 433 g of steam (MW = 18.02 g/mol) is cooled to 70.0 °C? ΔHfusion = 6.01 kJ/mol, heat capacity = 75.3 J/(mol °C), and ΔHVAP = 40.6 kJ/mol.What is the enthalpy change for heating ice from 266 K to steam at 378 K? Assume Cp = 37.7 J K-1 mol-1 for ice and steam and Cp = 75.3 J K-1 mol-1, delvapHo373 = 40.656 J mol-1, and delfusHo273 = 6008 J mol-1 Notes:answer in KJ/mol.
- a Why is the liquid-gas phase boundary in a single phase diagram component end at the critical point? b. Calculate the amount of heat, in kilojoules, associated with a drop in temperature of 33.5 oC in a 5.85 kg aluminum bar (specific heat of aluminum = 0.903 J g-1 oC-1). vs. Your roommate decides to cool the kitchen by opening the refrigerator. This strategy will it work? Explain your reasoning. d. Is the following statement correct? If not, rewrite it to be correct: ΔfHo (O (g)) = 0. e. For equimolar solutions of urea, BaCl2 and NaNO3, place the solutions in the order of increasing osmotic pressure.A glass of water with a mass of 0.32 kg at 20 ° C to be cooled to 0 ° C by dropping ice cubes at 0 °C into it. The latent heat of fusion of ice is 334 kJ/kg , and the specific heat of water is 4.18 kj/kg degree Celsius. The amount of ice that needs to be added is ?An unknown liquid is 2.77x104 Pa at 25°C and 5.643x104 Pa at 50 °C. has the x kJ/mol enthalpy of vaporization (ΔHvap), based on the Clausius-Clapeyron equation. What is the value of x in 3 significant figures?
- A rigid vessel contains 0.014 m3 of saturated-vapor steam in equilibrium with 0.021 m3 of saturated-liquid water at 373.15 K (100°C). Heat is transferred to the vessel until one phase just disappears, and a single-phase remains. Which phase (liquid or vapor) remains, and what are its temperature and pressure? How much heat is transferred in the process?Determine the entrophy change of (kJ/K) associated to the conversion of 10 kg of ice at -11 degrees celcius to steam at 121 degrees celciusName two characteristic physical properties that distinguish condensed from gas phases, and one which distinguishes solid from liquid phases. Discuss the differences for each property. Name one colligative property and by an equation (label all variables) and 1-2 sentences the physical meaning. Consider a balloon. What thermodynamic system does it represent? How does this system interact with the environment? Calculate the heat capacity at constant pressure of methane for all its contribution and the total value according to the equipartition theorem. What is a more realistic value at room temperature? Why?
