Calčulate the energy change during a pha change.Given the following information for water, H,0 (at 1 atm), calculate the amount of heat in kJ needed (at 1atm) to vaporize a 46.9-g sample of liquid water at its normal boiling point of 100 °C.AHvap(100 °C) = 40.7 kJ/molAHfus (0.00 °C) = 6.01 kJ/molboiling point = 100 °C%3Dmelting point = 0.00 °Cspecific heat liquid = 4.18 J/g°CkJCheck & Submit AnswerShow ApproachWe now have the tools needed to calculate both the amount of thermal energy required to warm an objectin a particular physical state and the amount of thermal energy required to change the physical state of asubstance. Interactive Figure 5.3.6 shows the energy involved in heating 100-g samples of benzene andwater over a large temperature range.26tvA huluW

Given data, Vaporisation enthalpy =∆Hvap = 40.7 kJ/mol Fusion enthalpy =∆Hfus = 6.01 kJ/mol Mass of…

Given the following information for water, H20 (at 1 atm), calculate the amount of heat in kJ needed (at 1 atm) to vaporize a 46.9-g sample of liquid water at its normal boiling point of 100 °C. boiling point = 100 °C AHvap(100 °C) = 40.7 kJ/mol %3D melting point = 0.00 °C AHfus(0.00 °C) = 6.01 kJ/mol %3D specific heat liquid = 4.18 J/g°C kJ

Given the following information for water, H20 (at 1 atm), calculate the amount of heat in kJ needed (at 1 atm) to vaporize a 46.9-g sample of liquid water at its normal boiling point of 100 °C. boiling point = 100 °C AHvap(100 °C) = 40.7 kJ/mol %3D melting point = 0.00 °C AHfus(0.00 °C) = 6.01 kJ/mol %3D specific heat liquid = 4.18 J/g°C kJ

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter8: Thermochemistry

Section: Chapter Questions

Problem 7QAP: Magnesium sulfate is often used in first-aid hot packs, giving off heat when dissolved in water. A...

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In a coffee-cup calorimeter, 1.60 g NH4NO3 is mixed with 75.0 g water at an initial temperature of 25.00C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.34C. Assuming the solution has a heat capacity of 4.18 J/C g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.
The enthalpy change when 1 mol methane (CH4) is burned is 890 kJ. It takes 44.0 kJ to vaporize 1 mol water. What mass of methane must be burned to provide the heat needed to vaporize 1.00 g water?
A student is asked to calculate the amount of heat involved in changing 10.0 g of liquid bromine at room temperature (22.5C) to vapor at 59.0C.To do this, one must use Tables 8.1 and 8.2 for information on the specific heat, boiling point, and heat of vaporization of bromine. In addition, the following step-wise process must be followed. (a) Calculate H for: Br2(l,22.5C)Br2(l,59.0C) (b) Calculate H for: Br2(l,59.0C)Br2(g,59.0C) (c) Using Hess's law, calculate H for: Br2(l,22.5C)Br2(g,59.0C)
The enthalpy of combustion of liquid n-hexane, C6H14, is 4159.5 kJ/mol, and that of gaseous n-hexane is 4191.1 kJ/mol. Use Hesss law to determine H for the vaporization of 1 mol of n-hexane: C6H14() C6H14(g)
Dissolving 6.00 g CaCl2 in 300 mL of water causes the temperature of the solution to increase by 3.43 C. Assume that the specific heat of the solution is 4.18 J/g K and its mass is 306 g. (a) Calculate the enthalpy change when the CaCl2 dissolves. Is the process exothermic or endothermic? (b) Determine H on a molar basis for CaCl2(s)H2OCa2+(aq)+2Cl(aq)
1. Which of the following processes requires the largest input of energy as heat? raising the temperature of 100 g of water by 1.0 °C vaporization of 0.10 g of water at 100 °C melting 1.0 g of ice at 0 °C warming 1.0 g of ice from −50 °C to 0 °C (specific heat of ice = 2.06 J/g · K)
Equal masses of liquid A, initially at 100C, and liquid B, initially at 50C, are combined in an insulated container. The final temperature of the mixture is 80C. All the heat flow occurs between the two liquids. The two liquids do not react with each other. Is the specific heat of liquid A larger than, equal to, or smaller than the specific heat of liquid B?
Suppose you wanted to cool 100. g of water from 20 C to 0 C using dry ice, CO2(s). The enthalpy of sublimation of CO2(s) is 25.2 kJ/mol. What mass of dry ice should you need? (a) 033 g (b) 15 g (c) 3.5 g (d) 150 g
Magnesium sulfate is often used in first-aid hot packs, giving off heat when dissolved in water. A coffee-cup calorimeter at 25C contains 15.0 mL of water at 25C. A 2.00-g sample of MgSO4 is dissolved in the water and 1.51 kJ of heat are evolved. (You can make the following assumptions about the solution: volume=15.0 mL, density=1.00 g/mL, specific heat=4.18J/gC.) (a) Write a balanced equation for the solution process. (b) Is the process exothermic? (c) What is qH2O? (d) What is the final temperature of the solution? (e) What are the initial and final temperatures in F?
It has been determined that the body can generate 5500 kJ of energy during one hour of strenuous exercise. Perspiration is the body’s mechanism for eliminating this heat. How many grams and how many liters of water would have to be evaporated through perspiration to rid the body of the heat generated during two hours of exercise? (The heat of vaporization of water is 40.6 kJ/mol.)
It has been determined that the body can generate 5500 kJ of energy during one hour of strenuous exercise. Perspiration is the bodys mechanism for eliminating this heat. What mass of water would have to be evaporated through perspiration to rid the body of the heat generated during 2 hours of exercise? (The heat of vaporization of water is 40.6 kJ/mol.)
Benzene, C6H6, is an organic liquid that freezes at 5.5 C (Figure 11.1) to form beautiful, feather-like crystals. How much energy is evolved as heat when 15.5 g of benzene freezes at 5.5 C? (The enthalpy of fusion of benzene is 9.95 kJ/mol.) If the 15.5-g sample is remelted, again at 5.5 C, what quantity of energy is required to convert it to a liquid?