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Heating and Cooling Curves Solutions Library

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131 solutions

Heating and Cooling Curves

Q. How many grams of ice at -9.1 ∘C can be completely converted to liquid at 16.4°C if the available heat for this process is 5.69×103 kJ?For ice, use...

Solved • Jul 2, 2020

Heating and Cooling Curves

Q. Calculate the enthalpy change, ΔH, for the process in which 38.9 g of water is converted from liquid at 10.4°C to vapor at 25.0°C . For water, ΔHva...

Solved • Jul 2, 2020

Heating and Cooling Curves

Q. How much energy (heat) is required to convert 52.0 g of ice at –10.0°C to steam at 100°C?specific heat of ice:           2.09 J/g·°C          ∆Hfus...

Solved • Feb 4, 2020

Heating and Cooling Curves

Q. Consider the heating curve shown below for 22.86 grams of an unknown substance. You may assume constant pressure conditions. Note: the points are l...

Solved • Dec 19, 2019

Heating and Cooling Curves

Q. Consider the heating curve shown below for 22.86 grams of an unknown substance. You may assume constant pressure conditions. Note: the points are l...

Solved • Dec 19, 2019

Heating and Cooling Curves

Q. Consider the heating curve shown below for 22.86 grams of an unknown substance. You may assume constant pressure conditions. Note: the points are l...

Solved • Dec 19, 2019

Heating and Cooling Curves

Q. Consider the heating curve shown below for 22.86 grams of an unknown substance. You may assume constant pressure conditions. Note: the points are l...

Solved • Dec 19, 2019

Heating and Cooling Curves

Q. From the data below, calculate the total heat (in J) needed to convert 12.0 g of ice at -5.0 °C to liquid water at 0.5 °C:ΔHfus= 6.02 kJ/mol, cliqu...

Solved • Dec 19, 2019

Heating and Cooling Curves

Q. How much energy is needed to convert 70.6 grams of ice at 0.00°C to water at 75.0°C?  specific heat (ice) = 2.10 J/g°Cspecific heat (water) = 4.18 ...

Solved • Nov 21, 2019

Heating and Cooling Curves

Q. From the data below, calculate the heat (kJ) involved in the transformation of 0.450 mol of ethanol (CH3CH2OH) gas at 275°C and 1 atm to solid etha...

Solved • Nov 4, 2019

Heating and Cooling Curves

Q. Which of the following statements is(are) true?(a) The enthalpy of vaporization is usually larger than the enthalpy of fusion because it takes less...

Solved • Nov 1, 2019

Heating and Cooling Curves

Q. Assume 12,500 J of energy is added to 2.0 moles of solid H2O (ice) at 0.0°C. The molar heat of fusion is 6.02 kJ/mole. The specific heat of water i...

Solved • Nov 1, 2019

Heating and Cooling Curves

Q. An open container holds ice of mass 0.570 kg at a temperature of -17.5°C. The mass of the container can be ignored. Heat is supplied to the contain...

Solved • Jul 10, 2019

Heating and Cooling Curves

Q. When water boils, what are the bubbles composed of?

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. Liquid butane, C4H10, is stored in cylinders, to be used as a fuel. The normal boiling point of butane is listed as -0.5oC.How much heat must be ad...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. If 42.0 kJ of heat is added to a 32.0-g sample of liquid methane under 1 atm of pressure at a temperature of -170oC, what is the final state of the...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. For many years drinking water has been cooled in hot climates by evaporating it from the surfaces of canvas bags or porous clay pots.How many grams...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. Compounds such as CCl2F2 are known as chlorofluorocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replace...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. Assume that the values given here for 1 mole of methanol are constant over the relevant temperature ranges.Given the heating curve for 1 mole of me...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. Based on the heating curve for water, does it take more energy to melt a mole of water or to boil a mole of water?

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. Assume that the values given here for 1 mole of benzene are constant over the relevant temperature ranges.Melting point5.4 oCBoiling point80.1 oCΔH...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. Assume that the values given here for 1 mole of benzene are constant over the relevant temperature ranges.Melting point5.4 oCBoiling point80.1 oCΔH...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. Assume that the values given here for 1 mole of benzene are constant over the relevant temperature ranges.Melting point5.4 oCBoiling point90.1 oCΔH...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. Assume that the values given here for 1 mole of methanol are constant over the relevant temperature ranges.Melting Point176 KBoiling Point338 KHfus...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. Assume that the values given here for 1 mole of methanol are constant over the relevant temperature ranges.Melting Point: 176 KBoiling Point: 338 K...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. Calculate the amount of heat required to completely sublime 56.0 g of solid dry ice (CO2 ) at its sublimation temperature. The heat of sublimation ...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. A 75.0 mL sample of water is heated to its boiling point. How much heat is required to vaporize it? (Assume a density of 1.00 g/mL.)

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. Determine the amount of heat (in kJ) required to vaporize 1.55 kg of water at its boiling point. For water, ΔHvap = 40.7 kJ/mol (at 100 oC).

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. A root cellar is an underground chamber used to store fruits, vegetables, and even meats. In extreme cold, farmers put large vats of water into the...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. Refer to the figure below to answer each question.A sample of steam begins on the line segment labeled 5 on the graph. Is heat absorbed or released...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. Refer to the figure below to answer each question.In moving from left to right along the line segment labeled 2 on the graph, heat is absorbed, but...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. The heat of combustion of CH4 is 890.4 kJ/mol and the heat capacity of H2O is 75.2 J/molK.Find the volume of methane measured at 298 K and 1.26 atm...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. A substance has a heat of vaporization of ΔHvap and heat of fusion of ΔHfus. Express the heat of sublimation in terms of ΔHvap and ΔHfus.

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. The human body obtains ​950 kJ of energy from a candy bar.If this energy were used to vaporize water at 100.0 oC​, how much water (in liters) could...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. Suppose that 1.08 g of rubbing alcohol (C3H8O) evaporates from a 71.0 g aluminum block. If the aluminum block is initially at 25 oC, what is the fi...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. How much ice (in grams) would have to melt to lower the temperature of 353 mL of water from 26 oC to 6 oC? (Assume the density of water is 1.0 g/mL.)

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. Examine the heating curve for water.Explain why the curve has two segments in which heat is added to the water but the temperature does not rise.

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. You just saw that the heat capacity of ice is ​Cs, ice = 2.09 J/g oC and that the heat of fusion of ice is 6.02 kJ/mol.​When a small ice cube at -1...

Solved • Nov 27, 2018

Heating and Cooling Curves

Q. An ice cube of mass 9.0 g at temperature 0oC is added to a cup of coffee, whose temperature is 95 oC and which contains 130 g of liquid. Assume the...

Solved • Nov 12, 2018

Heating and Cooling Curves

Q. Find ΔH for the freezing of water at -9.50˚C. The specific heat capacity of ice is 2.04 J/g•˚C and its heat of fusion is -332 J/g.

Solved • Nov 12, 2018

Heating and Cooling Curves

Q. Find ΔE for the freezing of water at -9.50˚C. The specific heat capacity of ice is 2.04 J/g•˚C and its heat of fusion is -332 J/g.

Solved • Nov 12, 2018

Heating and Cooling Curves

Q. Find q for the freezing of water at -9.50˚C. The specific heat capacity of ice is 2.04 J/g•˚C and its heat of fusion is -332 J/g.

Solved • Nov 12, 2018

Heating and Cooling Curves

Q. Find w for the freezing of water at -9.50˚C. The specific heat capacity of ice is 2.04 J/g•˚C and its heat of fusion is -332 J/g.

Solved • Nov 12, 2018

Heating and Cooling Curves

Q. Titanium tetrachloride, TiCl4, has a melting point of −23.2 °C and has a ΔHfusion = 9.37 kJ/mol.(a) How much energy is required to melt 263.1 g TiCl4?

Solved • Oct 30, 2018

Heating and Cooling Curves

Q. Evaporation of sweat requires energy and thus take excess heat away from the body. Some of the water that you drink may eventually be converted int...

Solved • Oct 30, 2018

Heating and Cooling Curves

Q. How much heat is required to convert 422 g of liquid H2O at 23.5 °C into steam at 150 °C?

Solved • Oct 30, 2018

Heating and Cooling Curves

Q. Sulfur dioxide is produced in enormous amounts for sulfuric acid production. It melts at −73°C and boils at −10.°C. Its ΔH°fus is 8.619 kJ/mol, and...

Solved • Oct 29, 2018

Heating and Cooling Curves

Q. From the data below, calculate the total heat (in J) needed to convert 22.00 g of ice at −6.00°C to liquid water at 0.500°C: mp at 1 atm:     0.0°C...

Solved • Oct 29, 2018

Heating and Cooling Curves

Q. Some ice cubes at 0 ˚C with a total mass of 403 g are placed in a microwave oven and subjected to 750. W (750. J/s) of energy for 5.00 minutes. Wha...

Solved • Oct 18, 2018

Heating and Cooling Curves

Q. A 20.0-g sample of ice at 210.0 ˚C is mixed with 100.0 g water at 80.0 ˚C. Calculate the final temperature of the mixture assuming no heat loss to ...

Solved • Oct 18, 2018

Heating and Cooling Curves

Q. A 0.250-g chunk of sodium metal is cautiously dropped into a mixture of 50.0 g water and 50.0 g ice, both at 0 ˚C. The reaction is2 Na (s) + 2 H2O ...

Solved • Oct 18, 2018

Heating and Cooling Curves

Q. An ice cube tray contains enough water at 22.0 ˚C to make 18 ice cubes that each has a mass of 30.0 g. The tray is placed in a freezer that uses CF...

Solved • Oct 18, 2018

Heating and Cooling Curves

Q. What quantity of energy does it take to convert 0.500 kg ice at -20. ˚C to steam at 250. ˚C? Specific heat capacities: ice, 2.03 J/g • ˚C; liquid, ...

Solved • Oct 18, 2018

Heating and Cooling Curves

Q. The molar heat of fusion of benzene (C 6H6) is 9.92 kJ/mol. Its molar heat of vaporization is 30.7 kJ/mol. Calculate the heat required to melt 8.25...

Solved • Oct 18, 2018

Heating and Cooling Curves

Q. The molar heat of fusion of sodium metal is 2.60 kJ/mol, whereas its heat of vaporization is 97.0 kJ/mol. What quantity of heat would be needed to ...

Solved • Oct 18, 2018

Heating and Cooling Curves

Q. The molar heat of fusion of sodium metal is 2.60 kJ/mol, whereas its heat of vaporization is 97.0 kJ/mol. What quantity of heat would be needed to ...

Solved • Oct 18, 2018

Heating and Cooling Curves

Q. Use the heating–cooling curve below to answer.What is the freezing point of the liquid?

Solved • Oct 18, 2018

Heating and Cooling Curves

Q. A substance, X, has the following properties:Sketch a heating curve for substance X starting at 250.8C.

Solved • Oct 18, 2018

Heating and Cooling Curves

Q. Determine the amount of heat (in kJ) required to vaporize 1.50 kg of water at its boiling point. For water, ΔHvap = 40.7 KJ/mol (at 100°C). Express...

Solved • Sep 27, 2018

Heating and Cooling Curves

Q. At 1 atm, how much energy is required to heat 59.0 g of H2O(s) at -120°C to H2 O(g) at 119.0°C?

Solved • Sep 24, 2018

Heating and Cooling Curves

Q. Water (2150 g) is heated until it just begins to boil. If the water absorbs 5.47 x 105 J of heat in the process, what was the initial temperature o...

Solved • Sep 18, 2018

Heating and Cooling Curves

Q. The fluorocarbon C2Cl3F3 has a normal boiling point of 47.6°C. The specific heats of C2Cl3F3(l) and C2Cl3F3(g) are 0.91 J/gK and 0.67 J/gK, respect...

Solved • Sep 18, 2018

Heating and Cooling Curves

Q. An ice bag containing 294 g of ice at 0°C was used to treat sore muscles. When the bag was removed, the ice had melted and the liquid water had a t...

Solved • Sep 17, 2018

Heating and Cooling Curves

Q. In a large building, oil is used in a steam boiler heating system. The combustion of 1.0-lb of oil provide: 2.4 x 107 J. How many kilograms of oil ...

Solved • Sep 17, 2018

Heating and Cooling Curves

Q. The following information is given for tin at 1 atm: Tb = 2270.00°C                      ΔHvap (2270.00°C) = 1.939 x 103 J/g Tm = 232.00°C         ...

Solved • Sep 7, 2018

Heating and Cooling Curves

Q. A pure solid sample of Substance X is put into an evacuated flask. The flask is heated at a steady rate and the temperature recorded as time passes...

Solved • Sep 7, 2018

Heating and Cooling Curves

Q. Calculate the heat energy released when 14.3 g of liquid mercury at 25.00°C is converted to solid mercury at its melting point. 

Solved • Sep 5, 2018

Heating and Cooling Curves

Q. At 1 atm, how much energy is required to heat 39.0 g of H2O(s) at -18.0°C to H2O 125.0°C? Helpful constants can be found here. 

Solved • Aug 30, 2018

Heating and Cooling Curves

Q. Calculate the amount of heat required to completely sublime 32.0 g of solid dry ice (CO2) at its sublimation temperature. The heat of sublimation f...

Solved • Aug 30, 2018

Heating and Cooling Curves

Q. Part AHow much heat is evolved in converting 1.00 mol of steam at 145°C to ice at 55.0°C? The heat capacity of steam is 2.01 J/(g°C) and of ice is ...

Solved • Aug 30, 2018

Heating and Cooling Curves

Q. How much heat energy is required to convert 19.6 g of solid ethanol at-114.5°C to gasesous ethanol at 177.9°C? The molar heat of fusion of ethanol ...

Solved • Aug 27, 2018

Heating and Cooling Curves

Q. Based on the thermodynamic properties provided for water, determine the energy change when the temperature of 0.850 kg of water decreased from 123°...

Solved • Aug 27, 2018

Heating and Cooling Curves

Q. How much heat energy is required to convert 97.9 g of liquid sulfur dioxide, SO2, at 202.6 K to gaseous SO2 at 263.1 K if the molar heat of vaporiz...

Solved • Aug 8, 2018

Heating and Cooling Curves

Q. How many grams of benzene, C6H6, can be melted with 39.7 kJ of heat energy? The molar heat of fusion of benzene is 9.95 kJ/mol. 

Solved • Aug 8, 2018

Heating and Cooling Curves

Q. How much heat energy is required to melt 388.9 g of HBr? The molar heat of fusion of HBr is 2.41 kJ/mol.

Solved • Aug 8, 2018

Heating and Cooling Curves

Q. How much heat energy is required to boil 93.7 g of ammonia, NH3? The molar heat of vaporization of ammonia is 23.4 kJ/mol.

Solved • Aug 8, 2018

Heating and Cooling Curves

Q. Enter your answer in the provided box.Calculate the amount of heat (in kJ) required to convert 140.1 g of water to steam at 100 °C.

Solved • Aug 7, 2018

Heating and Cooling Curves

Q. How much heat energy is required to convert 70.7 g of solid iron at 29 °C to liquid iron at 1538 °C? The molar heat of fusion of iron is 13.8 kJ/mo...

Solved • Aug 1, 2018

Heating and Cooling Curves

Q. How much heat energy is required to convert 93.1 g of liquid sulfur dioxide, SO2, at 199.9 K to gaseous SO2 at 263.1 K if the molar heat of vaporiz...

Solved • Aug 1, 2018

Heating and Cooling Curves

Q. Be sure to answer all parts.Determine the final state and temperature of 100 g of water originally at 25.0 °C after 50.0 kJ of heat have been added...

Solved • Aug 1, 2018

Heating and Cooling Curves

Q. Calculate the change in heat when 13.15 g of water vapor (steam) at 100.0 °C condenses to liquid water and then cools to 7.50  °C.

Solved • Jul 30, 2018

Heating and Cooling Curves

Q. Based on the thermodynamic properties provided for water (below and to the left), determine the amount of energy released for 0.6 kg of water to go...

Solved • Jul 30, 2018

Heating and Cooling Curves

Q. Ethanol (C2H5OH) melts at -114°C and boils at 78°C. The enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of vaporization is 38.56 kJ/...

Solved • Jul 25, 2018

Heating and Cooling Curves

Q. How much energy is needed to convert 70.6 grams of ice at 0.00°C to water at 75.0°C? specific heat (ice) = 2.10 J/g°C specific heat (water) = 4.18 ...

Solved • Jul 25, 2018

Heating and Cooling Curves

Q. Enter your answer in the provided box.Calculate the amount of energy (in kJ) necessary to convert 457 g of liquid water from 0°C to water vapor at ...

Solved • Jul 24, 2018

Heating and Cooling Curves

Q. he following information is given for iron at 1 atm: Tb = 2750.00°C        ΔHvap (2750.00°C) = 6.338 x 103 J/gTm = 1535.00°C        ΔHfus (1535.00°...

Solved • Jul 18, 2018

Heating and Cooling Curves

Q. The following information is given for magnesium at 1 atm: boiling point = 1090°C                        ΔHvap (1090°C) = 132 kJ/molmelting point =...

Solved • Jul 18, 2018

Heating and Cooling Curves

Q. To treat a burn on your hand, you decide to place an ice cube on the burned skin. The mass of the ice cube is 20.0 g, and its initial te temperatur...

Solved • Jul 16, 2018

Heating and Cooling Curves

Q. Ethanol (C2H3OH) melts at-114°Cand boils at 78°C. The enthalpy of fusion of ethanol is 5.02 kJ/mol and its enthalpy of vaporization is 38.56 kJ/mol...

Solved • Jul 16, 2018

Heating and Cooling Curves

Q. Calculate the heat energy released when 12.7 g of liquid mercury at 25.00°C is converted to solid mercury at its melting point. 

Solved • Jul 11, 2018

Heating and Cooling Curves

Q. After an afternoon party, a small cooler full of ice is dumped onto the hot ground and melts. If the cooler contained 8.30 kg of ice and the temper...

Solved • Jul 4, 2018

Heating and Cooling Curves

Q. A 750 gram block of ice @ -19 °Celsius absorbs 550,000 joules of energy. Describe the sample of water after it has absorbed all of that energy.

Solved • Jul 3, 2018

Heating and Cooling Curves

Q. How many kJ of heat are needed to completely vaporize 3.30 moles of H2O? The heat of vaporization for water at the boiling point is 40.6 kJ/mole. S...

Solved • Jun 25, 2018

Heating and Cooling Curves

Q. Enter your answer in the provided box. Sulfur dioxide is produced in enormous amounts for sulfuric acid production. It melts at 73.0 °C and boils a...

Solved • Jun 25, 2018

Heating and Cooling Curves

Q. Enter your answer in the provided box. From the data below, calculate the total heat (in J) needed to convert 20.00 g of ice at -4.75°C to liquid w...

Solved • Jun 25, 2018

Heating and Cooling Curves

Q. Enter your answer in the provided box. Sulfur dioxide is produced in enormous amounts for sulfuric acid production. It melts at -73.0°C and boils a...

Solved • Jun 25, 2018

Heating and Cooling Curves

Q. After an afternoon party, a small cooler full of ice is dumped onto the hot ground and melts. If the cooler contained 5.60 kg of ice and the temper...

Solved • Jun 12, 2018

Heating and Cooling Curves

Q. The heat of vaporization of water is 40.66 kJ/mol. How much heat is absorbed when 2.96 g of water boils at atmospheric pressure?

Solved • Jun 12, 2018

Heating and Cooling Curves

Q. At 1 atm, how much energy is required to heat 81.0 g of H2O (s) at -24.0°C to H2O (g) at 135.0°C?

Solved • Jun 12, 2018

Heating and Cooling Curves

Q. Calculate the heat energy (kJ) released when 23.6 g of liquid mercury at 25.00°C is converted to solid mercury at its melting point.

Solved • Jun 12, 2018