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Internal Energy Solutions Library

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158 solutions

Internal Energy

Q. At constant pressure, which of these systems do work on the surroundings? Check all that apply.a. 2A(g)+3B(g) → 4C(g)b. A(s)+B(g) → 2C(g)c. A(g)+B(...

Solved • Mar 13, 2020

Internal Energy

Q. Which of the following statements about energy is FALSE? A) Systems tend to change in order to lower their potential energy. B) Energy can be conve...

Solved • Oct 25, 2019

Internal Energy

Q. Calculate the change in internal energy (ΔE) for a system that is absorbing 35.8 kJ of heat and is expanding from 8.00 to 24.00 L in volume at 1.00...

Solved • Oct 25, 2019

Internal Energy

Q. The change in internal energy of a system made of 8 g of water vapor receiving 775 J of heat and delivering 525 J of work on the surroundings is:A....

Solved • Oct 9, 2019

Internal Energy

Q. Based on the first law of thermodynamics, will ΔE consistently equal zero?A. Yes, since ΔE is not in reference to the internal energy of a system, ...

Solved • Oct 9, 2019

Internal Energy

Q. If a balloon is inflated from a volume of 100.0 mL to 1.85 L against an external pressure of 1.00 atm, how much work is done (in J)? Hint: 1 L·atm ...

Solved • Sep 13, 2019

Internal Energy

Q. What is the ΔE (in J) of system that absorbs 12.4 J of heat and does 4.2 J of work on the surroundings?A. +16.6B. -12.4C. +4.2D. -16.6E. +8.2

Solved • Sep 13, 2019

Internal Energy

Q. To illustrate how to use the equation for PV work, let's imagine a bicycle pump. We will assume that the air in the bicycle pump can be approximate...

Solved • Aug 25, 2019

Internal Energy

Q. For ethanol, ΔvapH° = 43.5 kJ mol-1. (i) Calculate q, w, ΔH and ΔU when 1.75 mol C2H5OH (l) is vaporised at 260 K at constant external pressure. (i...

Solved • Aug 6, 2019

Internal Energy

Q. Calculate the change in internal energy (ΔE) for a system that is giving off 25.0 kJ of heat and is changing from 12.00 L to 6.00 L in volume at 1....

Solved • Aug 6, 2019

Internal Energy

Q. Consider what happens when a sample of the explosive TNT is detonated under atmospheric pressure.What is the sign of q for this process?

Solved • Jan 3, 2019

Internal Energy

Q. Consider what happens when a sample of the explosive TNT is detonated under atmospheric pressure.Is w positive, negative, or zero for the process?

Solved • Jan 3, 2019

Internal Energy

Q. A standard air conditioner involves a refrigerant that is typically now a fluorinated hydrocarbon, such as CH2F2. An air-conditioner refrigerant ha...

Solved • Jan 3, 2019

Internal Energy

Q. As shown here, one type of computer keyboard cleaner contains liquefied 1,1-difluoroethane (C2H4F2), which is a gas at atmospheric pressure. When t...

Solved • Jan 3, 2019

Internal Energy

Q. A system goes from state 1 to state 2 and back to state 1.Is E the same in magnitude for both the forward and reverse processes?

Solved • Jan 3, 2019

Internal Energy

Q. A system goes from state 1 to state 2 and back to state 1.Suppose the changes in state are reversible processes. Can you conclude anything about th...

Solved • Jan 3, 2019

Internal Energy

Q. A cylinder equipped with a piston expands against an external pressure of 1.51 atm. If the initial volume is 0.505 L and the final volume is 1.280 ...

Solved • Nov 12, 2018

Internal Energy

Q. The change in internal energy for the combustion of 1.0 mol of octane at a pressure of 1.0 atm is -5084.3 kJ. If the change in enthalpy is -5074.2 ...

Solved • Nov 12, 2018

Internal Energy

Q. The air in an inflated balloon (defined as the system) is warmed over a toaster and absorbs 125 J of heat. As it expands, it does 78 kJ of work. Wh...

Solved • Nov 12, 2018

Internal Energy

Q. A cylinder with a moving piston expands from an initial volume of 0.250 L against an external pressure of 2.10 atm. The expansion does 276 J of wor...

Solved • Nov 12, 2018

Internal Energy

Q. Lighters are usually fueled by butane (C4H10). When 1 mole of butane burns at constant pressure, it produces 2658 kJ of heat and does 3 kJ of work....

Solved • Nov 12, 2018

Internal Energy

Q. Which of the following is true of a reaction in which ΔV is positive?a. ΔH = ΔEb. ΔH > ΔEc. ΔH < ΔE

Solved • Nov 12, 2018

Internal Energy

Q. A chemical system produces 155 kJ of heat and does 23 kJ of work. What is ΔE for the surroundings?

Solved • Nov 12, 2018

Internal Energy

Q. Which of the following is true of the internal energy of the system and its surroundings following a process in which ΔEsys = +65 kJ.a. The system ...

Solved • Nov 12, 2018

Internal Energy

Q. A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. The lightbulb is turned on for 0.020 hour, and the assembly expands from...

Solved • Nov 12, 2018

Internal Energy

Q. A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. The lightbulb is turned on for 0.020 hour, and the assembly expands from...

Solved • Nov 12, 2018

Internal Energy

Q. The air within a piston equipped with a cylinder absorbs 565 J of heat and expands from an initial volume of 0.12 L to a final volume of 0.86 L aga...

Solved • Nov 12, 2018

Internal Energy

Q. When 1 mol of a fuel is burned at constant pressure, it produces 3453 kJ of heat and does 12 kJ of work. What is the value of ΔH for the combustion...

Solved • Nov 12, 2018

Internal Energy

Q. Which of the following is true of the internal energy of a system and its surroundings during an energy exchange with a negative ΔEsys?a. The inter...

Solved • Nov 12, 2018

Internal Energy

Q. Identify each of the following energy exchanges as primarily heat or work and determine whether the sign of E is positive or negative for the syste...

Solved • Nov 12, 2018

Internal Energy

Q. Identify each of the following energy exchanges as primarily heat or work and determine whether the sign of E is positive or negative for the syste...

Solved • Nov 12, 2018

Internal Energy

Q. If energy flows into a chemical system and out of the surroundings, what is the sign of ΔEsystem?

Solved • Nov 12, 2018

Internal Energy

Q. Consider these fictitious internal energy gauges for a chemical system and its surroundings:Which diagram best represents the energy gauges for the...

Solved • Nov 12, 2018

Internal Energy

Q. Consider the two diagrams below. The equations you obtained in parts (a) and (b) are based on what law?

Solved • Oct 31, 2018

Internal Energy

Q. Consider the two diagrams below. Would similar relationships hold for the work involved in each process? Why?

Solved • Oct 31, 2018

Internal Energy

Q. Which of the following cannot leave or enter a closed system? Heat, work, or matter?

Solved • Oct 31, 2018

Internal Energy

Q. Which cannot leave or enter an isolated system? Heat, work, or matter?

Solved • Oct 31, 2018

Internal Energy

Q. You lose 9 pounds over a 26-day period. Which of the following quantities act like a state function: the number of calories you consume, your weigh...

Solved • Oct 31, 2018

Internal Energy

Q. A gas-phase reaction was run in an apparatus designed to maintain a constant pressure.Predict whether w is positive, negative, or zero.

Solved • Oct 31, 2018

Internal Energy

Q. A gas is confined to a cylinder fitted with a piston and an electrical heater, as shown here:Suppose that current is supplied to the heater so that...

Solved • Oct 31, 2018

Internal Energy

Q. A gas is confined to a cylinder fitted with a piston and an electrical heater, as shown here:Suppose that current is supplied to the heater so that...

Solved • Oct 31, 2018

Internal Energy

Q. You may want to reference (Pages 166 - 172)Section 5.2 while completing this problem.A mixture of gases A2 and B2 are introduced to a slender metal...

Solved • Oct 31, 2018

Internal Energy

Q. Energy diagram for the reaction 2 H2(g) + O2(g) → 2 H2O(l) is shown below.The internal energy for Mg(s) and Cl2(g) is greater than that of MgCl2(s)...

Solved • Oct 31, 2018

Internal Energy

Q. Sign conventions for heat and work. Heat, q, gained by a system and work, w, done on a system are both positive quantities, corresponding to "depos...

Solved • Oct 31, 2018

Internal Energy

Q. Consider a system  consisting of the following apparatus, in which gas is confined in one flask and there is a vacuum in the other flask. The flask...

Solved • Oct 31, 2018

Internal Energy

Q. Consider a system consisting of the following apparatus, in which gas is confined in one flask and there is a vacuum in the other flask. The flasks...

Solved • Oct 31, 2018

Internal Energy

Q. Consider a system  consisting of the following apparatus, in which gas is confined in one flask and there is a vacuum in the other flask. The flask...

Solved • Oct 31, 2018

Internal Energy

Q. The accompanying photo shows a pipevine swallowtail caterpillar climbing up a twig. If the caterpillar is the system, can you predict the sign of q...

Solved • Oct 31, 2018

Internal Energy

Q. The accompanying photo shows a pipevine swallowtail caterpillar climbing up a twig. Does the change in potential energy depend on the caterpillars ...

Solved • Oct 31, 2018

Internal Energy

Q. During a normal breath, our lungs expand about 0.50 L against an external pressure of 1.0 atm. How much work is involved in this process (in J)?

Solved • Oct 31, 2018

Internal Energy

Q. Suppose that the gas-phase reaction 2NO(g) + O2(g) → 2NO2(g) were carried out in a constant-volume container at constant temperature.Would the meas...

Solved • Oct 31, 2018

Internal Energy

Q. Suppose that the gas-phase reaction 2NO(g) + O2(g) → 2NO2(g) were carried out in a constant-volume container at constant temperature.(a) Would the ...

Solved • Oct 31, 2018

Internal Energy

Q. A gas is confined to a cylinder under constant atmospheric pressure, as illustrated in the following figure. When the gas undergoes a particular ch...

Solved • Oct 31, 2018

Internal Energy

Q. A gas is confined to a cylinder under constant atmospheric pressure, as illustrated in the following figure. When the gas undergoes a particular ch...

Solved • Oct 31, 2018

Internal Energy

Q. The complete combustion of ethanol, C2H5OH(l), to form H2O(g) and CO2(g) at constant pressure releases 1235 kJ of heat per mole of C2H5OH. Draw the...

Solved • Oct 31, 2018

Internal Energy

Q. A 200-lb man decides to add to his exercise routine by walking up three flights of stairs (45 ft) 20 times per day. He figures that the work requir...

Solved • Oct 31, 2018

Internal Energy

Q. The air bags that provide protection in autos in the event of an accident expand because of a rapid chemical reaction. The air bags give off heat w...

Solved • Oct 31, 2018

Internal Energy

Q. A sample of gas is contained in a cylinder-and-piston arrangement. It undergoes the change in state shown in the drawing. Assume first that the cyl...

Solved • Oct 31, 2018

Internal Energy

Q. If a system does not change its volume during the course of a process, does it do pressure-volume work?

Solved • Oct 31, 2018

Internal Energy

Q. Calculate E, if q = 0.766 kJ and w = -840 J .

Solved • Oct 31, 2018

Internal Energy

Q. The diagram shows four states of a system, each with different internal energy, E. Which of the states of the system has the greatest internal energy?

Solved • Oct 31, 2018

Internal Energy

Q. The diagram shows four states of a system, each with different internal energy, E. Which expression(s) represent the difference in energy between S...

Solved • Oct 31, 2018

Internal Energy

Q. What is the value of ΔEDelta E if Efinal equals Einitial?

Solved • Oct 31, 2018

Internal Energy

Q. A closed system.If the piston is pulled upward so that it sits halfway between the position shown and the top of the cylinder, is the system still ...

Solved • Oct 31, 2018

Internal Energy

Q. Under what conditions will the quantities q and w be negative numbers?

Solved • Oct 31, 2018

Internal Energy

Q. Consider a system consisting of two oppositely charged spheres hanging by strings and separated by a distance r1, as shown in the accompanying illu...

Solved • Oct 31, 2018

Internal Energy

Q. Consider a system consisting of two oppositely charged spheres hanging by strings and separated by a distance r1, as shown in the accompanying illu...

Solved • Oct 31, 2018

Internal Energy

Q. In a thermodynamic study a scientist focuses on the properties of a solution in an apparatus as illustrated. A solution is continuously flowing int...

Solved • Oct 31, 2018

Internal Energy

Q. In a thermodynamic study a scientist focuses on the properties of a solution in an apparatus as illustrated. A solution is continuously flowing int...

Solved • Oct 31, 2018

Internal Energy

Q. Identify the force present, and explain whether work is being performed in the following cases.You lift a pencil off the top of a desk.

Solved • Oct 31, 2018

Internal Energy

Q. Consider a balloon filled with helium at the following conditions.313 g He 1.00 atm 1910. L Molar Heat Capacity = 20.8 J/°C • molThe temperature of...

Solved • Oct 19, 2018

Internal Energy

Q. Three gas-phase reactions were run in a constant-pressure piston apparatus as shown in the following illustration. For each reaction, give the bala...

Solved • Oct 18, 2018

Internal Energy

Q. One mole of H2O(g) at 1.00 atm and 100.°C occupies a volume of 30.6 L. When 1 mole of H2O(g) is condensed to 1 mole of H2O(l) at 1.00 atm and 100.°...

Solved • Oct 17, 2018

Internal Energy

Q. A balloon filled with 39.1 moles of helium has a volume of 876 L at 0.0°C and 1.00 atm pressure. The temperature of the balloon is increased to 38....

Solved • Oct 17, 2018

Internal Energy

Q. Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 40. cm3. If the combustion of this mixture release...

Solved • Oct 17, 2018

Internal Energy

Q. Calculate the internal energy change for each of the following. A piston is compressed from a volume of 8.30 L to 2.80 L against a constant pressur...

Solved • Oct 17, 2018

Internal Energy

Q. A system undergoes a process consisting of the following two steps: Step 1: The system absorbs 72 J of heat while 35 J of work is done on it. Step ...

Solved • Oct 17, 2018

Internal Energy

Q. Calculate ΔE for each of the following:b. q = +82 kJ, w = -47 kJ

Solved • Oct 17, 2018

Internal Energy

Q. A system releases 125 kJ of heat while 104 kJ of work is done on it. Calculate ΔE.

Solved • Oct 17, 2018

Internal Energy

Q. A gas absorbs 45 kJ of heat and does 29 kJ of work. Calculate ΔE.

Solved • Oct 17, 2018

Internal Energy

Q. When organic matter decomposes under oxygen-free (anaerobic) conditions, methane is one of the products. Thus, enormous deposits of natural gas, wh...

Solved • Oct 16, 2018

Internal Energy

Q. When organic matter decomposes under oxygen-free (anaerobic) conditions, methane is one of the products. Thus, enormous deposits of natural gas, wh...

Solved • Oct 16, 2018

Internal Energy

Q. Isooctane (C8H18; d = 0.692 g/mL) is used as the fuel in a test of a new automobile drive train.The energy delivered to the automobile’s wheels at ...

Solved • Oct 16, 2018

Internal Energy

Q. The scene below represents a physical change taking place in a piston-cylinder assembly:Can you determine whether ΔEsurr is +, −, or 0? Explain.

Solved • Oct 15, 2018

Internal Energy

Q. The scene below represents a physical change taking place in a piston-cylinder assembly:Is ΔHsys +, −, or 0?

Solved • Oct 15, 2018

Internal Energy

Q. The external pressure on a gas sample is 2660 mmHg, and the volume changes from 0.88 L to 0.63 L at constant temperature. Find w (in kJ) done on th...

Solved • Oct 15, 2018

Internal Energy

Q. At constant temperature, a sample of helium gas expands from 922 mL to 1.14 L against a pressure of 2.33 atm. Find w (in J) done by the gas (101.3 ...

Solved • Oct 15, 2018

Internal Energy

Q. What is the change in internal energy (in J) of a system that absorbs 0.615 kJ of heat from its surroundings and has 0.247 kcal of work done on it?

Solved • Oct 15, 2018

Internal Energy

Q. A system releases 255 cal of heat to the surroundings and delivers 428 cal of work. What is the change in internal energy of the system (in cal)?

Solved • Oct 15, 2018

Internal Energy

Q. A system receives 425 J of heat from and delivers 425 J of work to its surroundings. What is the change in internal energy of the system (in J)?

Solved • Oct 15, 2018

Internal Energy

Q. What is the change in internal energy (in kJ) when a gas does 135 J of work on the surroundings and at the same time absorbs 156 J of heat? a. 0.02...

Solved • Aug 14, 2018

Internal Energy

Q. Automobile airbags contain solid sodium azide, NaN3, that reacts to produce nitrogen gas when heated, thus inflating the bag.Calculate the value of...

Solved • Aug 13, 2018

Internal Energy

Q. Enter your answer in the rpovided box.In a gas expansion, 71 J of heat is absorbed by the system, and the energy of the system decreases by 124 J. ...

Solved • Aug 9, 2018

Internal Energy

Q. Automobile airbags contain solid sodium azide, NaN3, that reacts to produce nitrogen gas when heated, thus inflating the bag. 2NaN3 (s) → 2Na (s) +...

Solved • Aug 7, 2018

Internal Energy

Q. Calculate the work associated with the compression of a gas from 121.0 L to 80.0 L at a constant pressure of 16.7 atm. 

Solved • Jul 25, 2018

Internal Energy

Q. One mole of an ideal gas is expanded from a volume of 1.00 liter to a volume of 8.41 liters against a constant external pressure of 1.00 atm. How m...

Solved • Jul 17, 2018

Internal Energy

Q. A piston has an external pressure of 5.00 atm. How much work has been done in joules if the cylinder goes from a volume of 0.180 liters to 0.530 li...

Solved • Jul 5, 2018

Internal Energy

Q. An expanding gas does 173 J of work on its surroundings at a constant pressure of 1.01 atm. If the gas initially occupied 68.0mL, what is the final...

Solved • Jun 22, 2018

Internal Energy

Q. A Carnot engine receives 280 kW of heat from a heat-source reservoir at 500ºC and rejects heat to a heat-sink reservoir at 25ºC. What are the power...

Solved • May 12, 2018

Internal Energy

Q. Consider an ideal gas enclosed in a 1.00 L container at an internal pressure of 10.0 atm.Calculate the work, w, if the gas expands against a consta...

Solved • Apr 4, 2018