Chemistry Chemistry Practice Problems Solutions Library

Internal Energy Solutions Library

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206 solutions

Internal Energy

Q. True or False.The sum of all the energy of the molecules of an object is called the temperature of that object.

Solved • Mar 17, 2021

Internal Energy

Q. A piston has an external pressure of 11.0 atm. How much work has been done in joules if the cylinder goes from a volume of 0.180 liters to 0.480 li...

Solved • Jul 2, 2020

Internal Energy

Q. A mole of X reacts at a constant pressure of 43.0 atm via the reactionX(g) + 4 Y(g) → 2 Z(g), ΔH° = −75.0 kJBefore the reaction, the volume of the ...

Solved • Jul 2, 2020

Internal Energy

Q. An ideal gas (which is is a hypothetical gas that conforms to the laws governing gas behavior) confined to a container with a massless piston at th...

Solved • Jul 2, 2020

Internal Energy

Q. An ideal gaseous reaction (which is a hypothetical gaseous reaction that conforms to the laws governing gas behavior) occurs at a constant pressure...

Solved • Jul 2, 2020

Internal Energy

Q. How much work is done when a 155 g tomato is lifted 19.1 m?Express your answer with the appropriate units.An object can possess kinetic energy, the...

Solved • Jul 2, 2020

Internal Energy

Q. If a balloon is expanded from 0.055 L to 1.403 L against an external pressure of 1.02 atm, how many L⋅atm of work is done?  a) 0.056 L⋅atmb) -1.37 ...

Solved • Jun 30, 2020

Internal Energy

Q. Consider the following four casesi. A chemical process in which heat is absorbed.ii. A change in which q = 30 J, w = 44 J.iii. A process in which a...

Solved • Jun 30, 2020

Internal Energy

Q. A cylinder within a piston expands from a volume of 1.00 L to a volume of 7.00 L against an external pressure of 3.50 atmHow much work in J was don...

Solved • Jun 25, 2020

Internal Energy

Q. The gas in a piston (defined as the system) is warmed and absorbs 660 J of heat. The expansion performs 349 J of work on the surroundings.What is t...

Solved • Jun 25, 2020

Internal Energy

Q. A system releases 672 kJ of heat and does 120 kJ of work on the surroundings.What is the change in internal energy of the system?

Solved • Jun 25, 2020

Internal Energy

Q. A system absorbs 193 kJ of heat and the surroundings do 120 kJ of work on the system.What is the change in internal energy of the system?Express th...

Solved • Jun 25, 2020

Internal Energy

Q. A 21.0 L volume of an ideal gas in a cylinder with a piston is at a pressure of 3.0 atm. Enough weight is suddenly removed from the piston to lower...

Solved • Jun 25, 2020

Internal Energy

Q. A 21.0 L volume of an ideal gas in a cylinder with a piston is at a pressure of 3.0 atm. Enough weight is suddenly removed from the piston to lower...

Solved • Jun 25, 2020

Internal Energy

Q. The kinetic energy of a rolling billiard ball is given by KE=1.2mv2. Suppose a 0.17-kg billiard ball is rolling down a pool table with an initial s...

Solved • Jun 25, 2020

Internal Energy

Q. The kinetic energy of a rolling billiard ball is given by KE=1.2mv2. Suppose a 0.17-kg billiard ball is rolling down a pool table with an initial s...

Solved • Jun 25, 2020

Internal Energy

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

Solved • Jun 25, 2020

Internal Energy

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

Solved • Jun 25, 2020

Internal Energy

Q. A 21.0 L volume of an ideal gas in a cylinder with a piston is at a pressure of 3.0 atm. Enough weight is suddenly removed from the piston to lower...

Solved • Jun 25, 2020

Internal Energy

Q. A 21.0 L volume of an ideal gas in a cylinder with a piston is at a pressure of 3.0 atm. Enough weight is suddenly removed from the piston to lower...

Solved • Jun 25, 2020

Internal Energy

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

Solved • Jun 25, 2020

Internal Energy

Q. The kinetic energy of a rolling billiard ball is given by KE=1.2mv2. Suppose a 0.17-kg billiard ball is rolling down a pool table with an initial s...

Solved • Jun 25, 2020

Internal Energy

Q. For which one of the following reactions will ΔH be approximately (or exactly) equal to ΔE?H2(g) + Br2(g) → 2HBr(g)H2O(l) → H2O(g)CaCO3(s) → CaO(s)...

Solved • Apr 30, 2020

Internal Energy

Q. A mole of X reacts at a constant pressure of 43.0 atm via the reactionX(g)+4Y(g)=>2Z(g) ΔH=-75.0 kJBefore the reaction, the volume of the gaseou...

Solved • Apr 23, 2020

Internal Energy

Q. Which of the following statements about energy is FALSE?a) An object possessing energy can do work on another object.b) Energy can neither be creat...

Solved • Apr 14, 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. ΔH = ΔE when:A. 2NH3(g) goes from 225 °C to 120 °C at constant pressure. B. Liquid water goes to water vapor at some temperature and pressure C. 2 ...

Solved • Oct 9, 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. Calculate the change in internal energy for a gas using the first law of thermodynamics. The gas transfers 485 J of energy as heat to the surroundi...

Solved • Aug 25, 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. 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. When fuel is burned in a cylinder equipped with a piston, the volume expands from 0.255 L to 1.360 L against an external pressure of 1.02 atm. In a...

Solved • Nov 12, 2018

Internal Energy

Q. A cylinder and piston assembly (defined as the system) is warmed by an external flame. The contents of the cylinder expand, doing work on the surro...

Solved • Nov 12, 2018

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. A gas is compressed from an initial volume of 5.60 L to a final volume of 1.23 L by an external pressure of 1.00 atm. During the compression the ga...

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. A system absorbs 192 kJ of heat and the surroundings do 120 kJ of work on the system. What is the change in internal energy of the system?

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. The kinetic energy of a rolling billiard ball is given by KE = 1/2mv2. Suppose a 0.17-kg billiard ball is rolling down a pool table with an initial...

Solved • Nov 12, 2018

Internal Energy

Q. Determine whether the sign of E is positive or negative for the system.a. A rolling billiard ball collides with another billiard ball. The first bi...

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. 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. When 1 mol of a gas burns at constant pressure, it produces 2422 J of heat and does 6 kJ of work.Identify ΔE for the process.

Solved • Nov 12, 2018

Internal Energy

Q. When 1 mol of a gas burns at constant pressure, it produces 2422 J of heat and does 6 kJ of work.Identify ΔH for the process.

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. An amount of an ideal gas expands from 12.1 L to 24.1 L at a constant pressure of 1.0 atm. Then the gas is cooled at a constant volume of 24.1 L ba...

Solved • Nov 12, 2018

Internal Energy

Q. The heat of vaporization of water at 373 K is 40.7 kJ/mol. Find ΔE for the evaporation of 451 g of water at this temperature.

Solved • Nov 12, 2018

Internal Energy

Q. Find w for the change in state of 1.0 mol H2O(l) at 81 oC to H2O(g) at 115 oC. The heat capacity of H2O(l) = 75.3 J/mol K, heat capacity of H2O(g) ...

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. The internal energy of an ideal gas depends only on its temperature. Which of the following is true of an isothermal (constant-temperature) expansi...

Solved • Nov 12, 2018

Internal Energy

Q. The internal energy of an ideal gas depends only on its temperature.Explain.

Solved • Nov 12, 2018

Internal Energy

Q. Which of the following expressions describes the heat evolved in a chemical reaction when the reaction is carried out at constant pressure?a. ΔE - ...

Solved • Nov 12, 2018

Internal Energy

Q. A 21.0-L volume of an ideal gas in a cylinder with a piston is at a pressure of 3.2 atm. Enough weight is suddenly removed from the piston to lower...

Solved • Nov 12, 2018

Internal Energy

Q. A 21.0-L volume of an ideal gas in a cylinder with a piston is at a pressure of 3.2 atm. Enough weight is suddenly removed from the piston to lower...

Solved • Nov 12, 2018

Internal Energy

Q. Derive a relationship between ΔH and ΔE for a process in which the temperature of a fixed amount of an ideal gas changes.

Solved • Nov 12, 2018

Internal Energy

Q. A 21.0-L volume of an ideal gas in a cylinder with a piston is at a pressure of 3.2 atm. Enough weight is suddenly removed from the piston to lower...

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. 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 system releases 651 kJ of heat and does 130 kJ of work on the surroundings. What is the change in internal energy of the system?

Solved • Nov 12, 2018

Internal Energy

Q. The gas in a piston (defined as the system) is warmed and absorbs 660 J of heat. The expansion performs 346 J of work on the surroundings. What is ...

Solved • Nov 12, 2018

Internal Energy

Q. How much work (in J) is required to expand the volume of a pump from 0.0 L to 2.5 L against an external pressure of 1.2 atm?

Solved • Nov 12, 2018

Internal Energy

Q. During a breath, the average human lung expands by about 0.50 L. If this expansion occurs against an external pressure of 1.0 atm, how much work (i...

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 ΔE for the combustion...

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. During an energy exchange, a chemical system absorbs energy from its surroundings. What is the sign of ΔEsys for this process?

Solved • Nov 12, 2018

Internal Energy

Q. During an energy exchange, a chemical system absorbs energy from its surroundings. What is the sign of ΔEsys for this process? Explain.

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 the internal energy of the products of a reaction is higher than the internal energy of the reactants. In which direction does energy flow?

Solved • Nov 12, 2018

Internal Energy

Q. How is the change in internal energy of a system related to heat and work?

Solved • Nov 12, 2018

Internal Energy

Q. What is pressure-volume work?

Solved • Nov 12, 2018

Internal Energy

Q. How is the pressure-volume work calculated?

Solved • Nov 12, 2018

Internal Energy

Q. How is ∆H different from ∆E?

Solved • Nov 12, 2018

Internal Energy

Q. What is internal energy?

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. If the internal energy of the products of a reaction is higher than the internal energy of the reactants, what is the sign of ΔE for the reaction?

Solved • Nov 12, 2018

Internal Energy

Q. Give some examples of each. Drag the appropriate items to their respective bins.• Energy• Workkinetic energyexpansion of cylinderradiant energyheat...

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. What is meant by the internal energy of a system?

Solved • Oct 31, 2018

Internal Energy

Q. Imagine a container placed in a tub of water, as depicted in the accompanying diagram.If neither the volume nor the pressure of the system changes ...

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. 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)?  E...

Solved • Oct 31, 2018

Internal Energy

Q. How much work (in J) is involved in a chemical reaction if the volume decreases from 4.80 to 1.51 L against a constant pressure of 0.851 atm?        

Solved • Oct 31, 2018

Internal Energy

Q. Assume that the following reaction occurs at constant pressure: 2 Al(s) + 3 Cl2(g) → 2 AlCl3(s)(a) If you are given ΔH Delta {H}for the reaction, w...

Solved • Oct 31, 2018