A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. The lightbulb is turned on for 0.020 h, and the assembly expands from an initial volume of 0.90 L to a final volume of 5.88 L against an external pressure of 1.0 atm. You may want to reference (Pages 370 - 373) Section 9.3 while completing this problem. Part A Use the wattage of the lightbulb and the time it is on to calculate the heat transferred, q, in joules. (Assume that the cylinder and lightbulb assembly comprise the system and assume two significant figures.) Express your answer using two significant figures. Hνα ΑΣφ q = 7700 J Previous Answers Request Answer Submit X Incorrect; Try Again; One attempt remaining

A 100-W lightbulb is placed in a cylinder equipped with a moveable piston. The lightbulb is turned on for 0.020 h, and the assembly expands from an initial volume of 0.90 L to a final volume of 5.88 L against an external pressure of 1.0 atm. You may want to reference (Pages 370 - 373) Section 9.3 while completing this problem. Part A Use the wattage of the lightbulb and the time it is on to calculate the heat transferred, q, in joules. (Assume that the cylinder and lightbulb assembly comprise the system and assume two significant figures.) Express your answer using two significant figures. Hνα ΑΣφ q = 7700 J Previous Answers Request Answer Submit X Incorrect; Try Again; One attempt remaining

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter9: Energy And Chemistry

Section: Chapter Questions

Problem 9.72PAE: 9.72 Although it can be a nuisance when a laptop computer freezes up and needs to be rebooted, we...

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9.11 Analyze the units of the quantity (pressurevolume) and show that they are energy units, consistent with the idea of PV-work.
A 220-ft3 sample of gas at standard temperature and pressure is compressed into a cylinder, where it exerts pressure of 2000 psi. Calculate the work (in J) performed when this gas expands isothermally against an opposing pressure of 1.0 atm. (The amount of work that can be done is equivalent to the destructive force of about 1/4 lb of dynamite, giving you an idea of how potentially destructive compressed gas cylinders can be if improperly handled!)
The white pigment TiO2 is prepared by the reaction of titanium tetrachioride, TiCl4, with water vapor in the gas phase: TiCl4(g)+2H2O(g)TiO2(s)+4HCl(g). How much heat is evolved in the production of exactly 1 mole of TiO2(s) under standard state conditions?
You have a l.00-mole sample of water at 30.C and you heat it until you have gaseous water at 140.C. Calculate q for the entire process. Use the following data. Specificheatcapacityofice=2.03J/CgSpecificheatcapacityofwater=4.18J/CgSpecificheatcapacityofsteam=2.02J/Cg H2O(s)H2O(l)Hfusion=6.02KJ/mol(at0C)H2O(l)H2O(g)Hvaporization=40.7KJ/mol(at100.C)
Hydrogen bums in air with considerable heat transfer to the surroundings. Consider the decomposition of water togaseous hydrogen and oxygen. Without doing any calculations, and basing your prediction on the enthalpychange and the entropy change, is this reaction product-favored at 25 C? Explain your answer briefly.
8.44. Determine an expression for , the change in the constant-pressure heat capacity, for an electrochemical process. Hint: See equation 8.30 and use the definition of heat capacity.
High-quality audio amplifiers generate large amounts of heat. To dissipate the heat and prevent damage to the electronic components, heat-radiating metal fins are used. Would it be better to make these fins out of iron or aluminum? Why? (See Table 7- l for specific heat capacities.)
Among other things, an ideal fuel for the control thrusters of a space vehicle should decompose in a spontaneous exothermic reaction when exposed to the appropriate catalyst. Evaluate the following substances under standard state conditions as suitable candidates for fuels. (a) Ammonia: 2NH3(g)N2(g)+3H2(g) (b) Diborane: B2H6(g)2B(g)+3H2(g) (c) Hydrazine: N2H4(g)N2(g)+2H2(g) (d) Hydrogen peroxide: H2O2(l)H2O(g)+12O2(g)
How many moles of isooctane must be burned to produce loo U of heat under standard state conditions?
9.72 Although it can be a nuisance when a laptop computer freezes up and needs to be rebooted, we accept that as somewhat inevitable. But clearly the need to occasionally reboot the control system for the power grid would not be acceptable. Use the web to research ways that engineers ensure the reliability of crucial systems like the control infrastructure of the grid, and write a paragraph summarizing the main strategies employed.
A cubic piece of uranium metal (specific heat capacity = 0.117 J/C g) at 200.0C is dropped into 1.00 L deuterium oxide ("heavy water;" specific heat capacity = 4.21 I J/C g) at 25.5C. The final temperature of the uranium and deuterium oxide mixture is 28.5C. Given the densities of uranium (19.05 g/cm3) and deuterium oxide (1.11 g/mL). what is the edge length of the cube of uranium?
The statement Energycan beneithercreatednor destroyedis sometimes used as an equivalent statement of the first law of thermodynamics. There areinaccuracies to the statement, however. Restate it tomake it less inaccurate.