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September 5, 2015

Search: Calculate the amount of heat required to completely sublime 85.0 of solid dry ice at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 .

Number of results: 56,530

Chemistry
The value of H for the reaction below is -482 kJ. Calculate the heat (kJ) released to the surroundings when 12.0 g of CO (g) reacts completely.
April 6, 2010 by Camarra

chemistry
1. the volume of an idea gas is 2.06L at standard temperature and pressure. Calculate the volume at 1.75 atm and 27CELCIUS. 2. Ethane, C2h6 has a molar heat of vaporization of 15kj/mole. How many kilojoules or energy are required to vaporize 5 g of ethane?
December 1, 2009 by stephanie

Intermediate Algebra
Atmospheric carbon dioxide levels continue to increase and are suspected to contribute to global warming. The solution to the polynomial equation x3 380x2 + 2x 760 = 0 gives the record high amount of carbon dioxide in parts per million (ppm) in 2005, as measured at Mauna ...
November 6, 2014 by Babydoll2007

Chemistry
You wish to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 359.5 ppm and is initially uniform through the thickness of the steel. The atmosphere of...
December 16, 2012 by Please Help Me!!!!!!!!

ap chemisty
Calculate the heat of formation of butane given that the heat of formation of H20(l) is -285.3 kj/mol and the heat of formation of CO2(g) is -393.5 kj/mol.
September 24, 2010 by Sarah

Physics Problem
While running, a 70.0 kg student generates thermal energy at a rate of 1200 W. To maintain a constant body temperature of 37.0 C, this energy must be removed by perspiration or other mechanisms. If these mechanisms failed and the heat could not flow out of the student's body, ...
December 3, 2007 by Molly

physics
1 The specific heat of a substance at its boiling point or melting point Is 0 Is infinity Is negative lies between 0 and 1 2 A unit mass of solid converted to liquid at its melting point. Heat is required for this process is Specific heat Latent heat of vaporization Latent ...
April 12, 2015 by promise

physics
1 The specific heat of a substance at its boiling point or melting point Is 0 Is infinity Is negative lies between 0 and 1 2 A unit mass of solid converted to liquid at its melting point. Heat is required for this process is Specific heat Latent heat of vaporization Latent ...
April 17, 2015 by solomon

Chemistry
A sample of .234g of carbon is placed in a closed stainless steel bomb with .502g of of oxygen gas. The mixture is ignited giving of carbon dioxide. How many grams of carbon dioxide should be obtained upon combustion?
February 21, 2010 by Ben

Physics
A physicist converted 2 kg of water at 37 degrees celcius to steam at 100 degrees celcius. Assuming no heat is lost, calculate the amount of energy needed to heat to 100 degrees celcius.
June 5, 2015 by i need help

PHYSICS
The average coefficient of volume expansion for carbon tetrachloride is 5.81 10-4 (C)−1. If a 42.5-gal steel container is filled completely with carbon tetrachloride when the temperature is 10C, how much will spill over when the temperature rises to 26.5C? ______gal
November 14, 2012 by Sarah

Chemistry
CaCl2(s) Ca2+(aq) + 2 Cl-(aq) H = -81.5 kJ A 14.0 g sample of CaCl2 is dissolved in 130. g of water, with both substances at 25.0C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat capacity...
November 10, 2007 by Joe

physical
An air-cooled motorcycle engine loses a significant amount of heat through thermal radiation according to the Stefan-Boltzmann equation. Assume that the ambient temperature is T0 = 22.3C (295.45 K). Suppose the engine generates 13.5 hp (10.07 kW) of power and, due to several ...
July 23, 2012 by itufizik

physics
An air-cooled motorcycle engine loses a significant amount of heat through thermal radiation according to the Stefan-Boltzmann equation. Assume that the ambient temperature is T0 = 24.5C (297.65 K). Suppose the engine generates 11.5 hp (8.58 kW) of power and, due to several ...
November 5, 2014 by Anonymous

physics
An air-cooled motorcycle engine loses a significant amount of heat through thermal radiation according to the Stefan-Boltzmann equation. Assume that the ambient temperature is T0 = 24.5C (297.65 K). Suppose the engine generates 11.5 hp (8.58 kW) of power and, due to several ...
November 9, 2014 by Anonymous

chemistry
if 27 grams of ice at 0 degrees celsius is added to 123 grams of water at 100 degrees celsius in an insulated container, calculate the final temperature. assume specific heat of water is 4.184 J/K g
October 4, 2012 by Gabriel

AP Chemistry
okay, so i'm working on a specific heat lab right now. I have one question that I am really stuck on... Here it is: Why should the metal be dry before dropping it into the calorimeter? ... is it because it affects the heat of the cube or it affects the mass of water? ... i'm ...
November 30, 2009 by Jane

AP Chemistry
okay, so i'm working on a specific heat lab right now. I have one question that I am really stuck on... Here it is: Why should the metal be dry before dropping it into the calorimeter? ... is it because it affects the heat of the cube or it affects the mass of water? ... i'm ...
November 30, 2009 by Jane

chemistry
An insulated beaker contains 250.0 grams of water at 25oC. Exactly 41.6 g of a metal at 100.0oC was dropped in the beaker. The final temperature of the water was 26.4oC. Assuming that no heat is lost in any other way, calculate the specific heat of the metal. a. 0.159 J g-1 K-...
January 21, 2012 by utna

Chemistry (check)
Not sure if these are right 1) What is the Molar Enthalpy of Neutralization (ΔHn) in kJ/mol if 5.00 moles of HCl(aq) (acid) neutralized 5.00 moles of NaOH(aq) (base) and released 13093 J of heat? 13093/5= 2618.6 then convert to kj 2) Calculate the Molar Enthalpy of ...
June 30, 2013 by Mary

Chemistry
An ice cube at 0.00 degree celsius with a mass of 23.5 g is placed into 550.0 g of water, initially at 28.0 degree celsius, in an insulated container. Assuming that no heat is lost to the surroundings, what is the temperature of the entire water sample after all the ice has ...
April 27, 2012 by Amir

Chemistry
The initial temperature of a bomb calorimeter is 28.50C. When a chemist carries out a reaction in this calorimeter, its temperature decreases to 27.45C. If the calorimeter has a mass of 1.400 kg and a specific heat of 3.52 J/(gC), how much heat is absorbed by the reaction?
July 8, 2013 by Timmy

Chemistry
Urea (NH2)2CO is prepared by reacting ammonia with carbon dioxide. The byproduct is water. 637.2g of ammonia are reacted with 787.3 g of carbon dioxide. a. Which of the two reactants is a limiting reactant? Show your calculations (including the correctly balanced chemical ...
February 27, 2014 by Nyla

chemistry
Imagine that 25.0 of ice at -3.0C is placed in a container holding water vapor at temperature of 120.0C . After a certain amount of time, the container has expanded slightly, but holds only water vapor at 110.0C. what is the final volume of the container? you may assume the ...
December 5, 2011 by Fajer

chemistry
Imagine that 25.0 of ice at -3.0C is placed in a container holding water vapor at temperature of 120.0C . After a certain amount of time, the container has expanded slightly, but holds only water vapor at 110.0C. what is the final volume of the container? you may assume the ...
December 5, 2011 by Fajer

Chemistry
5.00g of an unknown solid was heated to 99.7 degrees C and placed in a calorimeter with 1.25L H20. The initial temp of the water was 25.0 degrees C. During the experiment, the temperature of the water rose to 63.5 degrees C. what is the specific heat of the sample? Do you ...
November 7, 2011 by Samantha

Chemistry
I have previously posted this question, but now I am lost question: A calorimeter is filled with 10.0 millimole (mmole) of methane gas and an excess of oxygen. When burned, the ignition wire releases 107.2 J of heat. The heat capacity of the calorimeter (including the bomb and...
July 19, 2014 by Liz

science
how many kilojoules of heat must be transferred to a 480 g aluminum pizza pan to raise its temperature from 22 degree c to 234 degree c? The specific heat of aluminum in this temperature range is 0.97 J/g degree C.
October 28, 2011 by Justin

chemistry
When a 3.90-g sample of solid ammonium nitrate dissolves in 60.0 g of water in a coffee-cup calorimeter, the temperature drops from 24.5C to 19.3C. Calculate DH (in kJ/mol NH4NO3) for the solution process NH4NO3(s) ---> NH4+(aq) + NO3-(aq) Assume that the specific heat of...
July 4, 2012 by Kevin

chemistry
Exactly .203g of zinc metal is dissolved in dilute HCl(aq) in an ice calorimeter. The heat released melts enough ice to produce a volume change of 0.254mL in the ice water mixture surrounding the reaction vessel. Calculate the enthalpy change per mole of zinc for the reaction...
November 15, 2014 by xx

chemistry
the heat of fusion for thallium is 21 J/g, and its heat of vaporization is 795 J/g. Thallium's melting point is 304 degrees celsius, and its boiling point is 1457 degrees celsius. The specific heat of liquid thallium is 0.13 J/g degrees celsius. How much heat is needed to ...
February 23, 2010 by billy

chemistry
Twenty grams of aluminum metal at 83.2 C were mixed with 49.3 g of water at 19.7 C. Assuming no heat loss, what was the final temperature of the Aluminum water metal? specific heat for Al= 0.215 specific heat for H2O=1.00
October 15, 2014 by Jennifer

Chemistry
A 5.00 gram sample of aluminum pellets (specific heat capacity = 0.89 J/g*C) and a 10.00 gram sample of iron pellets (specific heat capacity = 0.45 J/g*C) are heated to 100.0 *C. The mixture of hot iron and aluminum is then dropped into 97.3 gram of water at 22.0*C. Calculate ...
October 12, 2010 by Anonymous

chemistry, please help!!
The combusion of glucose produces carbon dioxide and water vapor according to the chemical equation below: C6H12O6 (s) + 6O2 (g) ---> 6CO2 (g) + 6H2O (g) DELTA H = -2540 kj Calculate the energ involved in making 75.0 g of glucose from carbon dioxide and liquid water (...
March 28, 2011 by Rachel

Chemistry
A 2.75 kg block of ice is heated until it completely melts. It is then heated again until it completely changes to water vapor. Is more energy required to melt the ice or to vaporize the liquid water.
January 29, 2015 by Morgan

Chem
NaOH + HCl --> NaCl + H2O What is the amount of heat absorbed by water? given: mass: 102.2 grams specific heat: .9601 cal/g degrees C
April 6, 2010 by Janae

phisic
Treating air as an ideal gas of diatomic molecules, calculate how much heat is required to raise the temperature of the air in an 7.47 m by 14.9 m by 2.87 m room from 19.9C to 21.7C at 101 kPa. Neglect the change in the number of moles of air in the room
May 3, 2011 by please help me

Chemistry
The heat of combustion of benzene, C6H6, is -41.74 kJ/g. Combustion of 3.65 of benzene causes a temperature rise of 4.41 C^o in a certain bomb calorimeter. What is the heat capacity of this bomb calorimeter? (kJ/C^o) So, I what I did was I multiplied -41.74 kJ/g and 3.65 to ...
December 15, 2014 by Bobby

Chemistry
Consider a 67-g chunk of ice (∆Hfus = 6.0 kkJ/mol) in a beaker immersed in a water bath. To produce just enough heat to melt the ice, how many moles of solid NaOH (∆Hsoln = -445.1 kJ/mol) must you dissolve in the water bath? Please show all work. Thanks in advance.
June 19, 2013 by Stacie

Chemistry
I got 0.907 KJ for ΔHcomb but I don't know if its correct. I also don't know how to write the equation. -------- question: A calorimeter is filled with 10.0 mole of methane gas and an excess of oxygen. When burned, the ignition wire releases 107.2 J of heat. The heat ...
July 16, 2014 by Liz

physics
120 grams of an unknown metal at a temperature of 95 degrees celcuius is poured into 140 grams of aluminum calorimeter containing 220 grams of water. If the inital temperature of the water and calorimeter was 15 degree celcuius and the final temperature was 18 celcius, find ...
December 21, 2014 by christoper allen

Chemistry
Could someone explain Le Chatelier's principle to me? Thanks Reactions tend to go to the direction that reduces stress: stress from pressure, temperature. If a reaction gives off heat (exothermic), it will go faster if temperature is reduced, ie, it is easier to give off heat ...
March 15, 2007 by Aubrey

Chemistry- URGENT please HELP
NH4NO3(s)+H2O(l)→NH4NO3(aq) ΔH = +25.7 kJ. What is the final temperature in a squeezed cold pack that contains 49.0g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18J/(g⋅∘C) for the solution, an initial temperature of 28.5∘C, ...
November 17, 2014 by Bri

chemistry
how much heat is required to raise the temperature of a 35 gm block of aluminum from 125 to 322 degrees?
November 26, 2012 by maryam

science
The specific heat capacity of the lava is 1600 J kg -1 degrees Celsius -1 . When all the erupted lava cools from the eruption temperature of 1050 degrees Celsius to 15 degrees Celsius, the heat released is 2 x 10 15 J. Calculate a value for the total mass of lava that erupted...
May 9, 2007 by k

physics, PLEASE ANSWER, I really need help!
The basal metabolic rate is the rate at which energy is produced in the body when a person is at rest. A 70.0 kg person of height 1.79 m would have a body surface area of approximately 1.90 m^2. What is the net amount of heat this person could radiate per second into a room at...
December 6, 2009 by AE

chemistry
calculate Ke for the following(equilibrium concertations given below substances H2(g) + Br(g)=2 Br+heat, N2O4(g) + heat= NO2(G)
June 1, 2010 by jessica

physics
A physical science student adds 500g of 0 degree C ice to 500g of 80 degree C coffee. What is the final temperature of the drink after thermal equilibrium is reached? How much of the ice was melted by the process? Assume coffee has same specific heat as water.
July 17, 2011 by Heat

geometry
100.0 g of copper(II) carbonate (molar mass = 123.56 g/mol) was heated until it decomposed completely. The gas was collected and cooled to room temperature and normal pressure (25C and 1.00 atm). What volume of carbon dioxide was produced? The reaction is: CuCO3(s) CuO(s...
December 8, 2010 by sassy

Physics- LOST!
If the air temperature is the same as the temperature of your skin (about 30.0 C), your body cannot get rid of heat by transferring it to the air. In that case, it gets rid of the heat by evaporating water (sweat). During bicycling, a typical 70.0 kg person's body produces ...
December 3, 2007 by Jamie

science
Two blocks of different temperatures are brought together. Block A is a 360.0-kg block is made of Material X which has a temperature-dependent specific heat. Its initial temperature is TA = 200.0 C. Block B is a 1000.0-kg iron block with an initial temperature TB = 27.0 C...
November 6, 2012 by Morgan

chemistry
A 10.0 grams piece of gold 90.0 Celsius was stirred into 15.0ml of water at an initial temperature of 25.0 degrees Celsius. The final temperature of the water was 26.34 degrees celsius. Calculate the specific heat of gold. The specific heat of water is 4.184 J/g- degrees celsius
October 20, 2011 by casey

Chemistry
The molar heat of solution of NH4NO3 is 25.7 kJ/mol. How much heat (in kJ) would be required to dissolve 20 grams of NH4NO3 in water?
December 14, 2010 by Hannah

chemistry
How much heat is required to warm 250.4 g of water from 22.6 C to 75.8 C given that the specific heat capacity of water is 4.184 J/gx degrees C?
November 3, 2011 by Teresa

chem
How much energy (in Joules) is required to heat 13.48 g of water from 10.5 oC to 46.2 oC ? Use 4.184 J/goC as the specific heat capacity of water.
March 26, 2012 by emily

Chemistry
When 25.0 g of ethanol vapor condenses, 23.6 kJ of heat is released. How much heat is required in kJ to vaporize 254 g of ethanol?
October 13, 2010 by Jordin

chemistry
if the heat of combustion of glucose is -2808 kJ/mol, how many grams of glucose are required to supply 1650 kJ of heat?
November 12, 2012 by Anonymous

science
3. How would the carbon cycle be affected if all producers were removed? (1 point) Carbon compounds in animals would not be broken down to release carbon dioxide back into the atmosphere. Carbon would not have a way to enter the bodies of living things. Carbon dioxide levels ...
January 21, 2014 by asha

chemistry
The dH for the reaction below is -482 kJ. Calculate the heat (kJ) released to the surroundings when 12.0 g of CO (g) reacts completely. 2CO(g) + O2(g) --> 2CO2(g)
April 16, 2012 by tank

chemistry
The dH for the reaction below is -482 kJ. Calculate the heat (kJ) released to the surroundings when 12.0 g of CO (g) reacts completely. 2CO(g) + O2(g) --> 2CO2(g)
April 16, 2012 by tank

accounting -annual amount
The exhaust-gas temperature leaving a continuously operating furnace is 260C, and a proposal is being considered to install a heat exchanger in the exhaust-gas stream to generate low-pressure steam at 105C. the question to be investigate is whether it is economical to ...
November 18, 2010 by Alicia

accounting -annual amount
The exhaust-gas temperature leaving a continuously operating furnace is 260C, and a proposal is being considered to install a heat exchanger in the exhaust-gas stream to generate low-pressure steam at 105C. the question to be investigate is whether it is economical to ...
November 18, 2010 by Alicia

physics - Heat transfer
A round scar of area 'A' is formed on the chest of a man of temperature 37C. The rate of heat radiated from this scar is 1% more than that from the remaining part of the body. What will be the excess temperature at this scar over other parts of the body?
February 5, 2012 by uma

Chemistry
What mass of ice would you have to add to water to get the same change in temperature as if you add 7.55 grams of dry ice to water if they both started at the same temperature?
April 17, 2012 by annonymous

Chemistry
What amount of energy is required to completely ionize 21.5 grams of carbon atoms in the gas phase (C(g)) if the ionization energy of C(g) is 1086 kJ/mole? Answer in units of J
October 17, 2012 by Peter

chemistry
I had to do this online lab and have a total of 8 questions at the end and I am stuck half way through. Can someone please walk me through the last few question? Here is the Lab and my homework: In this experiment, we will determine the heat of reaction for a neutralization ...
June 29, 2009 by Gweedo8

physics
A 33.1 g ring that appears to be silver is heated to a temperature of 77C, and then placed in a calorimeter containing 5.00 10-2 kg of water at 24.0C. The calorimeter is not perfectly insulated, however, so that 0.14 kJ of energy is transferred by heat to the surroundings by...
January 13, 2013 by I'm going to die please help

Chem
In a coffee cup calorimeter, 50.0 mL of 0.100 M AgNO3 and 50.0 mL of 0.100 M HCl are mixed to yield the following reaction: Ag+ (aq) + Cl- (aq) -----------------> AgCl (s) The two solutions were initially at 22.60 C, and the final temperature is 23.40 C. Calculate the ...
November 2, 2011 by Joe

physics
A person with skin area 2 m2 and 0.97 radiation efficiency is at rest and has a skin temperature of 28 C in an environment with a uniform temperature of 22 C. Calculate the heat loss rate if the skin temperature is raised by 8 C by vigorous exercise.
August 18, 2011 by KAIT

physics
A person with skin area 2 m2 and 0.97 radiation efficiency is at rest and has a skin temperature of 28 C in an environment with a uniform temperature of 22 C. Calculate the heat loss rate if the skin temperature is raised by 8 C by vigorous exercise.
August 18, 2011 by KAIT

physics
A person with skin area 2 m2 and 0.97 radiation efficiency is at rest and has a skin temperature of 28 C in an environment with a uniform temperature of 22 C. Calculate the heat loss rate if the skin temperature is raised by 8 C by vigorous exercise.
August 18, 2011 by KAIT

Chemistry
We apply the same amount of energy to 10.0-g samples of aluminum, and silver which begin at the same temperature.Rank the metals from highest to lowest temperature after the heat is applied.
May 10, 2012 by Chris

chemistry
In a hydrocarbon-based combustion reaction, what two molecules are most likely to be products? A. carbon dioxide and water B. sulfur dioxide and zinc oxide C. sulfur dioxide and cyclopentane D. carbon monoxide and hydroxide
November 29, 2011 by ashley

chemistry
A 115 g piece of metal, initially at 60.0 C, is submerged into 100.0 g of water at 25.0 C. At thermal equilibrium, this mixture had a final temperature of 27.0 C. The specific heat capacity of water is 4.18 (J/gC). Use this information to determine the specific heat ...
March 1, 2013 by Brandi

science
Calculate the Molar Enthalpy of Neutralization (Hn) in kJ/mol of the reaction between a monoprotic acid and a monoprotic base, given the following information: The temperature change equals 5.30C, 50.0 mL of 1.00 M concentration of Acid 50.0 mL of 1.00 M concentration of ...
November 17, 2013 by brittany sheats

Physics
How much heat is required to completely boil away 0.200 kg of water (Hv = 2.26 10^3 kJ/kg)? (Points : 1) 4.52 102 kJ 2.26 103 kJ 4.52 103 kJ 1.13 104 kJ
March 20, 2014 by Me and I

Chem!!
Consider the dissolution of CaCl2: CaCl2(s) -----------> Ca2+(aq) + 2Cl-(aq) ΔH=-81.5 kJ/mol An 11.0 gram sample of CaCl2 is dissolved in 125 g water with both substances at 25.0 C. Calculate the final temperature of the solution assuming the solution has no heat loss...
November 2, 2011 by Bob

physics
A 3.00x10^-3 kg lead bullet enters a target with a speed of 2.00x10^2 m/s and comes to rest within the target. Calculate the rise in temperature of the bullet assuming that 80.0% of the heat produced is absorbed by the bullet. The Specific heat of lead is 1.30x10^2 J/kg K
March 25, 2012 by Elizabeth

Chem
Given that 277J of heat are absorbed when 1.12g of sodium nitrate are dissolved in water, calculate the heat of reaction.
July 15, 2012 by Shirley

Chem
Butane, C4H10, is widely used as a fuel for disposable lighters. When one mole of butane is burned in oxygen, carbon dioxide and steam are formed and 2658 kJ of heat is evolved. a) Write the thermochemical equation for the reaction. First I wrote the chemical equation for the ...
February 1, 2007 by Chris

chemstry
calculate the amount of energy required to convert 55.0g of ice at -10.0c into steam at 125c?
November 29, 2012 by celeste

chemistry
When carbon dioxide is heated in a closed container, it decomposes into carbon monoxide and oxygen according to the following equilibrium equation: 2CO2(g) 2CO(g) + O2(g) When 2.0 mol of CO2(g) is placed in a 5.0-L closed container and heated to a particular temperature, the ...
March 31, 2008 by Laureta

physics
Objects A and B have the same mass of 3.4 kg and are at their melting points. They melt when 4.9 104 J of heat is added to A and when 11 104 J is added to B. (a), (b) Determine the latent heat of fusion for the substance from which each object is made. (c) Find the heat ...
April 24, 2013 by Anonymous

Chemistry- Please help me
A sample consisting of 22.7 g of a nongaseous, unstable compound X is placed inside a metal cylinder with a radius of 8.00 cm, and a piston is carefully placed on the surface of the compound so that, for all practicla purposes, the distance between the bottom of the cylinder ...
December 16, 2008 by Lauren

Physics (Thermodynamics)
27.300kg of Copper at 35.000 degrees Celsius receives 460.000kJ of heat. Calculate the final temperature of the metal. ANS = degrees Celsius Copper specific heat = 0.39kJ/kg degrees Celsius. Q = mc (t2 - t1) Q = 460.000kJ m = 27.300kg c = 0.39kJ/kg t1 = 35 degrees Celsius t2...
July 4, 2013 by Danny

Chem
41. How much heat energy must you use to raise the temperature of 100 grams of water from 60C to 70C. Show your calculations. 42. You have a pot of 100C liquid water. If you add heat to the water, will the temperature start to raise at once? why or why not. Thank you for your ...
September 15, 2014 by Sierra

chemistry
What will be the final temperature of the water in an insulated container as the result of passing 5.00 g of steam [H2O(g)] at 100.0C into 195.0 g of water at 20.0C? (?Hvap = 40.6 kJ/mol H2O) The best way to do these problems is to make the heat gained + heat lost = 0. q1...
October 12, 2006 by hal

chemistry
what volume of carbon dioxide is formed when 11 of CS2 reacts with 18 L O2 to produce carbon dioxide gas and sulfur dioxide gas at STP?
May 13, 2013 by danna

thermodynamics
3.4 A heat engine operates between two heat reservoirs with temperatures of 560 and 280 K a) The heat engine itself has a temperature of 560 K during heat addition from the 560 K reservoir and a temperature of 280 K during heat rejection to the 280 K reservoir. The thermal ...
June 15, 2007 by jody

PHYSICS
Identify the following gas compression descriptions as adiabatic, isothermal or isobaric. a. As the gas compresses, the internal energy U, decreases when the temperature decreases; the work done on the gas is greater than the heat removed from the gas: ___________________ b. ...
March 3, 2012 by GRISSELL

Chemistry
to increase the carbon content of a slab of steel by exposing it to a carburizing atmosphere at elevated temperature. The carbon concentration in the steel before carburization is 200.5 ppm and is initially uniform through the thickness of the steel. The atmosphere of the ...
December 15, 2012 by Ankur

Thermodynamics
27.300kg of Copper at 35.000 degrees Celsius receives 460.000kJ of heat. Calculate the final temperature of the metal. ANS = degrees Celsius Copper specific heat = 0.39kJ/kg degrees Celsius. Q = mc (t2 - t1) Q = 460.000kJ m = 27.300kg c = 0.39kJ/kg t1 = 35 degrees Celsius t2...
July 5, 2013 by Danny

Chemistry
Is heat lost in heating water and ice? No. Entropy is lost, but heat energy is not lost.
December 3, 2006 by Lisa

Physics
A precious-stone dealer wishes to find the specific heat capacity of a 0.036-kg gemstone. The specimen is heated to 95.0C and then placed in a 0.17-kg copper vessel that contains 0.086 kg of water at equilibrium at 25.0C. The loss of heat to the external environment is ...
January 18, 2010 by Jay

chemistry
A 1.800 g sample of octane, C8H18, was burned in a bomb calorimeter whose total heat capacity is 11.66 kJ/C. The temperature of the calorimeter plus contents increased from 21.12C to 29.85C. What is the heat of combustion per gram of octane? What is the heat of combustion ...
January 31, 2013 by evgeny

Chemistry I
In determining the heat capacity of a calorimeter, 50ml of water at 56*C is added to 50ml of water at 23*C. After about five minutes of mixing, the final temperature of the solution inside the calorimeter reached 37*C. Calculate the heat capacity of the calorimeter (J/*C-...
October 22, 2012 by Josh

Physics
A 2.5 kg block of ice at a temperature of 0C and an initial speed of 5.7 m/s slides across a level floor. If 3.3*10^5 J are required to melt 1.0 kg of ice, how much ice melts, assuming that the initial kinetic energy of the ice block id entirely converted to the ice's internal...
February 20, 2012 by Riley

Physics
A 0.4 kilogram sample of Aluminum at 115 degrees Celsius is put into a container containing 0.5 kilograms of water at 15 degrees Celsius. Neglecting the small amount of energy absorbed by the container and knowing that the specific heat of Aluminum is 900 kJ/kg*C, and the ...
July 17, 2014 by Anna

Chemistry - General
1. Consider a calorimeter into which 135g of water at 45.3 degrees Celsius is added. The initial temperature of the calorimeter was 23.8C and the equilibrium temperature of the water and the calorimeter is 39.6C. Assuming there is no heat loss to the surroundings, what is the ...
July 24, 2009 by Sahar

Physics
A large pot is placed on a stove and 1.2 kg of water at 14C is added to the pot. The temperature of the water is raised evenly to 100C just before it starts to boil. (a) What amount of heat is absorbed by the water in reaching 100C? (b) The water then boils until all of it ...
October 27, 2014 by Alexandra

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