Tuesday
July 22, 2014

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: 37,202

Chemistry
What is the specific heat of a substance if 2100 J is required to raise a 312 g sample by 15 degrees Celsius? So I use the q = mcΔT formula 2100J = (312 g)c(85 C - 15 C) I'm not sure if I did it right.
May 20, 2014 by Katherina Ramos

College Chemistry
The density of a 0.0122 M KMnO4 is 1.037 g/mL. Suppose 26.35 g of 0.0122 M KMnO4 are required to titrate 1.072 g of a household H2O2 solution. a)Calculate the mL of MnO4^- added to reach the endpoint. b)Calculate the moles of MnO4^- added to reach the endpoint. c)Calculate the...
February 25, 2014 by Kelsey

Chemistry
When 10.00g of phosphorus is burned in O2(g) to form P4O10(s), enough heat is generated to raise the temperature of 2990g of water from 18.0 ∘C to 38.0 ∘C. Calculate the heat of formation of P4O10(s) under these conditions. -------------------------------------- ...
February 25, 2014 by John

Tax Accounting
Mike purchases a heavy-duty truck (5-year class recovery property) for his delivery service on April 30, 2010. The truck is not considered a passenger automobile for purposes of the listed property and luxury automobile limitations. The truck has a depreciable basis of $39,080...
June 1, 2013 by Anonymous

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

accounting
On December 31, 2008, University Theatres issued $500,000 face value of bonds. The stated rate is 6 percent, and interest is paid semiannually on June 30 and December 31. The bonds mature in 10 years. Required: If required, round your answers to the nearest whole dollar. ...
July 20, 2011 by me

Chemistry
I want to know the enthalpy change for this reaction which occurs in a blast furnace: Fe2O3(s) + 3C(s) --> 2Fe(l) + 3CO(g) You will need the heat of formation for CO, and ironIIIoxide, and the heatofmelting for iron. I suspect you have some temperature in mind also which ...
April 15, 2007 by Alice

Science
A student heats 4.00 g of a blue compound, which reacts completely to produce 2.56 g of a white compound and an unknown amount of colorless gas. What is the mass of the gas? Answer?_________ Work area: Reactant (s) = Product (s)
November 30, 2009 by Tanner

Physics
During a particular thunderstorm, the elctric potential difference between the clouds and the groud is Vcloud-Vgroud = 10^9 volts with the cloud being at the higher potential. Now, there is a lightning flash in which a charge of -25C is transferred from the ground to the cloud...
January 26, 2010 by Es

Physics
A portion of an electric circuit connected to a 7 ohm resistor is embedded in 1.20 kg of a solid substance in a calorimeter. The external portion of the circuit is connected to a 100 volt power supply. (a) Assuming that all the heat generated by the resistor is absorbed by the...
May 10, 2009 by Fred

physics
When 1180 J of heat are added to one mole of an ideal monatomic gas, its temperature increases from 272 to 292 K. Find the work done by the gas during this process. I know the specific heat is Q/delta T, so C = (1180 J)/(20K) = 59. This seems like any easy problem, but now I'm...
June 22, 2007 by tmaria

math
An analysis of the ledger detail is required to differentiate owner's equity beginning balance from the amount of additional investments made during the period. True
April 22, 2014 by Anonymous

Chemistry II
C4H4 (g) + 2 H2 (g) --> C4H8 (g) Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 (-2341 kJ/mol), C4H8 (-2755 kJ...
May 20, 2007 by Jayd

AP CHEMISTRY
A solution is prepared in which a trace or small amount of Fe2+ is added to a much larger amount of solution in which the [OH-] is 1.0 x 10^-2 M. Some Fe(OH)2 precipitates. The value of Ksp for Fe(OH)2 = 8.0 x10^-10. A. Assuming that the hydroxide is 1.0 x 10^-2 M, calculate ...
April 11, 2012 by DAN

geography check
the atmosphere:A)creayes tides b)has no effect on heat gain or loss c)allows heat to escape quickly D)keeps heat from escaping too quickly into space. i choose b
August 8, 2009 by henry

chem 105
How many liters of , measured at 20 , must be burned to provide enough heat to warm 28.3 of water from 15.5 to 31.3 , assuming that all the heat of combustion is transferred to the water, which has a specific heat of 4.18 ? Recall that .
March 27, 2013 by Anonymous

chemistry
LP gas burns according to the exothermic reaction: C3H8(g) + 5 O2(g) right arrow 3 CO2(g) + 4 H2O(g) ΔHrxn = −2044 kJ What mass of LP gas is necessary to heat 1.2 L of water from room temperature (25.0C) to boiling (100.0C)? Assume that during heating, 18% of ...
March 30, 2013 by Dr. Phil

ocean county college
A 150 g sample of metal at 55.0 C raises the temperature of 150 g of water from 23.0 C to 35.0 C. Determine the specific heat of the metal in J/g C. Hint: #1 First find heat absorbed by water using formula q = mass x specific heat x change in temp (of water). #2 Use this value...
March 21, 2010 by adina

Chemistry
Given that the specific heat capacities of ice and steam are 2.06 J/g degrees celsius, respectively, and considering the information about water given in exercise 16, calculate the total quantity of heat evolved when 10.0g of steam at 200. degrees celsius is condensed, cooled...
April 16, 2012 by Rachael

CIS Design and Programming
Design a program that calculates the total amount of a meal purchased at a restaurant. The program should ask the user to enter the charge for the food, and then calculate the amount of a 15 percent tip and a 7 percent sales tax. Display each of the amounts and the total.
April 29, 2009 by Dornica

accounting
Write the journal entries to record the following transactions. A) Sold merchandise on account, $11,000, terms 2/10, net 30. The cost of merchandise sold was $8,000 (2 entries required). B) Issued a credit memorandum for $500 to the customer for merchandise sold in A. (2 ...
March 6, 2012 by kmo

Material Science
A polystyrene ice chest contains 3 kg of ice at 0 degrees Celsius. Triangle H for melting = 3.34 x 10 to the 5 power J/kg p = 1000 kg/m cubed, CP =4190 J/ (kg K). Heat transfer is limited by conduction (k=0.06W/m K)) from the outside wall at 30 degrees Celsius. This means that...
August 24, 2013 by Joy

Chemistry
How much 0.300 M NaOH is required to completely neutralize 30.0 ml of 0.15 M HClO4 Clue: M1V1=M2V2 I still dont get it to i times .300x30.0 then times .300 x.15 i just dont understand what i am actually suppose to multiply
July 18, 2012 by Ann

Chemistry
Heat transfer from the system to the surroundings has a large effect on Ssurr ___________. a. when the temperature of the surroundings is low. b. when the temperature of the surroundings is high. c. when the temperature of the system is low. d. when the temperature of the ...
July 30, 2012 by Taylor

Chemistry
I am thrown off by this question because they dont give a molecule to work with. Also i don't know how i would work the acid... help! A 195 mL solution of a dilute acid is added to 102 mL of a base solution in a coffee-cup calorimeter. The temperature of the solution increases...
March 29, 2014 by Ali

chemistry
A gas absorbs 45 kJ of heat and does 29 kJ of work. Calculate the change in energy. The answer is 16 kJ, but I don't understand why. If a gas absorbs heat and does 29 kJ of work. Wouldn't they both be positive? Change in energy = q + w 45 kJ + 29 kJ = 74 kJ Why is the work ...
March 31, 2010 by Jake

chemistry
Liquid nitrogen, which has a boiling point of 77 K, is commonly used to cool substances to low temperatures. How much energy must be removed from 1.4 kg of gaseous nitrogen at 77 K for it to completely liquefy? Assume the latent heat of liquid nitrogen is 2.01 105 J/kg. ...
April 25, 2012 by please help

Physical science
To investigate whether the amount of heat produced will depend on an increase on the concentration of HCL when HCL reacts with an excess Zn
April 20, 2013 by Miss p

Chemistry
A coffee-cup calorimeter initially contains 125 g water at 24.2 degrees celsius. Potassium bromide (10.5 g), also at 24.2 degree celsius, is added to the water, and after the KBr dissolves, the final temperature is 21.1 degrees celsius. Calculate the enthalpy change for ...
February 13, 2012 by Elle

physics
lead is a soft, dense metal with a specific heat of 0.028 kcal/kg degrees C, a melting point of 328.0 degrees C and a heat of fusion of 5.5 kcal/kg. How much heat must be provided to melt a 250.0 kg sample of lead with a temperature of 20.0 degrees Celsius? q1 = heat to move ...
November 21, 2006 by Erica

physical science
How do you calculate the heat generated from dropping a metal ball from heights?
November 21, 2007 by Scott

Chemistry
Calculate the heat released when 25.0 grams of water freezes at 0 degrees celsius.
December 28, 2008 by Completely Lost

chemistry
how do I calculate what temperature is needed to heat 52 grams of ethane to occupy 1200ml?
November 17, 2010 by david

chemistry
calculate the change in temperature if 16.9kJ of heat was removed from 500.0g of water
May 24, 2011 by Anonymous

Chemistry
Is it possible to calculate heat of vaporization if i only have pressure and temperature.
July 20, 2011 by San

chemistry
Calculate and record the average molar heat of reaction from the three results.
April 16, 2013 by Anonymous

chemistry
A gas absorbs 25kj of heat and does 12kj of work calculate (triangle) E
April 16, 2013 by S

chemistry
calculate the heat needed at 0c each of the following joules to freeze 275gof water
January 29, 2014 by delana

chemistry
calculate the volume of .100 M KOH required to titrate 50 ml of .15 M HCl
May 18, 2010 by jared

Physics
A 3.5 kg body accelerates from rest to 20 m/s in 5 s. Calculate: A its acceleration B the force required.
November 21, 2010 by Claire

chemistry
for the vaporization of water at 1.00 atm, delta H=43.54 kj/mol at 298 K and delta H= 40.68 kj/mol at 373 K. the constant-pressure heat capacity of liquid water is 75.3 J/molK. calculate the constant pressure heat capacity for H2O(g).
May 9, 2011 by anna

CHEM HELP ASAP!!
Two 20.0-g ice cubes at 10.0 C are placed into 275 g of water at 25.0 C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts. heat capacity h2o (S)=37.7 j/mol*k heat capacity h2o (l)=75.3 j/mol*...
September 11, 2012 by Jordan

Chemistry
27) What volume of benzene (C6H6, d= 0.88 g/mL, molar mass = 78.11 g/mol) is required to produce 1.5 x 103 kJ of heat according to the following reaction? 2 C6H6(l) + 15 O2(g) 12 CO2(g) + 6 H2O(g) Hrxn = -6278 kJ
December 8, 2012 by Jennifer

Chemistry 1
Imagine that a hypothetical life form is discovered on our moon and transported to Earth. On a hot day, this life form begins to sweat, and it is determined that the heat of vaporization of its sweat is 215 cal/g. The scientist observing the extraterrestrial life form also ...
January 24, 2014 by Molly

chemistry
At 20 degrees celsius the vapor pressure of dry ice is 56.5 atm. If 10 g of dry ice (solid CO2) is placedin in an evacuated 0.25 L chamber at a constant temperature of 20 degrees celsius, will all of the solid sublime?
January 25, 2011 by john

physics
If 8.00 moles of a monatomic ideal gas at a temperature of 260 are expanded isothermally from a volume of 1.08 to a volume of 4.14 .Calculate the work done by the gas.Calculate the heat flow into or out of the gas.If the number of moles is doubled, by what factors do your ...
December 9, 2010 by demitri

How do I calculate the number of atoms in a compou
I have the mass of the amount of substance, and the molar masses. How do I do this? Is this the same as calculating the number of molecules/ formula units? Also, I know the number of atoms for each element in the compound (It made me calculate that before)
November 19, 2012 by pinkmercy

physics
The specific heat capacity of ice is about 0.5 cal/g degree C A)Supposing that it remains at that value all the way to absolute zero, calculate the number of calories it would take to change a 0.50g ice cube at absolute zero (-273 degree C}) to 0.50 g of boiling water. B)How ...
April 3, 2012 by christy

Chemistry
time(s) 30 60 120 180 240 300 420 480 t(*c) 13.8 13.8 13.9 13.1 14.2 14.3 14.5 14.7 14.8 b. if t1= 24.5*c, T2= 1.5*C, tr= 23.6*c, and with the tf obtained from the plot, determine Ccal, in J/*C, if the procedure descrived in the laboratory is followed. 3.when 0.600g of metal ...
April 14, 2011 by Daniel Medaris

chemistry
35.00mL of 0.250M KOH solution is required to completely neutralize 10.50mL of H2SO4 solution. what is the molarity of the sulfuric acid solution KOH(aq)+ H2SO4 -------> K2SO4(aq) +H2O(l
March 15, 2012 by brina

chemistry
a 10.0mL vinegar sample was completely neutralized by 22.5mL 0.2M NaOH solution. calculate molarity and % of acetic acid in vinegar. please help
April 26, 2010 by confused

chemistry
Balanced chemical equation, calculate how many moles of products would be prduced of 0.500 mole of the first reactant were to react completely. CO2 + 4H2 = CH4+ 2H2O
April 18, 2012 by Anonymous

Chemistry
Given the unbalanced equation: (NH4)2 CO3-> NH3 + CO2 + H2O Calculate the mass of ammonia gas that is produced if 1.25g of ammonium carbonate decomposes completely.
April 22, 2012 by Lindsey

Math
A person wants to establish an annuity for retirement purposes. He wants to make quarterly deposits for 20 years so that he can then make quarterly withdrawals of $5,000 for 10 years. The annuity earns 7.32% interest compounded quarterly. A. How much will have to be in the ...
April 21, 2014 by Anonymous

chemistry
Ammonia, NH3, is used as a refrigerant. At its boiling point of -33C, the enthalpy of vaporization of ammonia is 23.3 kJ/mol. How much heat is required to vaporize 125 g of ammonia at -33C?
May 12, 2010 by b

Physics
What work is required to stretch a spring of spring constant 500N/m from x1=.2m to x2=.25m? Assume the unstreched position is at x=0. W=Fd so w=(500)(.25-.2) =500(.05) =25J is this correct? Calculate the work required to compress an initially uncompressed spring with a spring ...
October 17, 2007 by Andrea

chemistry
How do you calculate the amount of nodes in orbitals?
August 30, 2011 by Van M

Science
How do you calculate the amount of people in a city?
October 4, 2009 by Easton

chemistry
calculate the amount of camphor ( in moles)
October 21, 2011 by Tito

Chemistry
How much energy as heat is removed from the hand when 5.00 grams of Ga initially at 20 degrees C melts? The value of Heat Fusion is 5.576 kJ-mol and the specific heat of Ga is 0.374 J-g-K. Take the final temp to be 29.76 degrees C.
February 7, 2013 by Student

Chemistry
How much energy as heat is removed from the hand when 5.00 grams of Ga initially at 20 degrees C melts? The value of Heat Fusion is 5.576 kJ-mol and the specific heat of Ga is 0.374 J-g-K. Take the final temp to be 29.76 degrees C.
February 8, 2013 by Student

management
Given the following amount of work in seconds required at each station: _____________________ A 38 J 32 X 22 B 34 K 30 Y 18 C 35 L 34 Z 20 a. What is the possibility daily output of this process if 8 hours of processing time is available each day?
January 30, 2011 by Dj

Physics - Unit Conversion
I am trying to calculate heat transfer between two objects. The units are as follows: mass: grams specific heat: cal/gm degree celsius temperature: degree celcius My numbers aren't working out and I know how to do the problem. So, what's the deal with the gm. Is that gram mass...
December 4, 2012 by Brenda

Chemistry
A piece of dry ice (solid carbon dioxide) with a mass of 25.5 g is allowed to sublime (convert from solid to gas) into a large balloon. Assuming that all of the carbon dioxide ends up in the balloon, what will be the volume of the balloon at a temperature of 18 degrees Celsius...
February 24, 2011 by Jake

Chemistry
A piece of dry ice (solid carbon dioxide) with a mass of 25.5 g is allowed to sublime (convert from solid to gas) into a large balloon. Assuming that all of the carbon dioxide ends up in the balloon, what will be the volume of the balloon at a temperature of 18 degrees Celsius...
February 24, 2011 by Jake

chemistry
Given that the specific heat capacities of ice and steam are 2.06 J/g degrees celsius and 2.03 J/g degrees celsius, respectively, and considering the information about water given, calculate the total quantity of heat evolved when 10.0g of steam at 200degrees. celsius is ...
April 16, 2012 by Anonymous

Chemistry
Are my answers correct? C6H14 + 19/2 O2 -> 6 CO2 + 7H2O enthalpy change = -4163 kJ a) if 0.537 mol of carbon dioxide is produced in the reaction represented by the equation above, how much heat is released by the reaction? Enthalpy change = 0.537 mol CO2 x -4163kJ/6 mol CO2...
February 10, 2013 by A Canadian

Chemistry
Calculate mole solute in solution? I added an amount of an unknown sample to a solution. I found that the molality of the solution is 0.085m and there is 0.0156kg of solvent. Calculate the moles of solute present in solution? Thanks!
September 8, 2012 by Jones

Algebra
Suppose Alice buys a car and obtains a 5 year loan for $25,000 at an interest rate of 6%. Suppose A is the amount borrowed, r is the interest rate (in decimal form), and m is the total number of monthly payments. Let w = (r)/(12) Then the formula to determine the monthly ...
July 30, 2009 by Shelly

Algebra
Suppose A is the amount borrowed, r is the interest rate (in decimal form), and m is the total number of monthly payments. Let w = (r)/(12) Then the formula to determine the monthly payment amount for a loan is given by (Aw)/1-(1)/(1+w)^m Suppose Alice buys a car and obtains a...
July 31, 2009 by Pamela

chem
1. Calculate the heat (calories) produced by the solution of 3.75 g of NaOH Hint: Remember that the reaction is exothermic. 2. Calculate the number of calories that would be produced if one mole of sodium hydroxide was dissolved. (ΔHsolnNaOH) For #1. delta H(solution)=deltaH(...
October 19, 2006 by Maria

Chemistry
in a chemical reaction, 5.2 grams of magnesium reacts with hydrogen nitrate. Calculate the amount of magnesium nitrate that is produced and the amount of hydrogen nitrate needed to react with the magnesium.
February 17, 2014 by Anonymous

chemistry
The enthalpy of vaporization at 298 K for diethylether (C4H10C) is 26.0 kj/mol. How much heat would be required to vaporize 1.00 L of the ether at 298 K if its density is 0.714 g/L ? A) 250 kj B) 74.1 kj C) 186 kj D) 130 kj E) 440 kj
June 21, 2010 by Jim

math
your credit card balance is $1150 and the minimum monthly payment required is 3%. what is the minimum amount you must pay this month? A $25.50 B $31.00 C $34.50 D $39.00
October 28, 2008 by isabel

chemistry
What will happen in this reaction: NH3 + H2 = NH4 when x amount of NH4 is added, equilibrium is reached, then 2x is removed. to the product side because the amount taken out is greater than amount that is added? if amount added is x and amount removed is also x, then would the...
April 23, 2010 by bme1

Chem
Use the table to calculate an approximate enthalpy or heat of reaction for the combustion of one mole of methane gas (CH4) to form gaseous H2O and CO2. What Volume (in L) of methane is needed to produce 3329 kJ of heat for methane gas at 36 oC and 9.15 atm pressure? I got 20.7...
November 16, 2012 by Anonymous

Chem
Use the table to calculate an approximate enthalpy or heat of reaction for the combustion of one mole of methane gas (CH4) to form gaseous H2O and CO2. What Volume (in L) of methane is needed to produce 3329 kJ of heat for methane gas at 36 oC and 9.15 atm pressure? I got 20.7...
November 16, 2012 by Anonymous

Chemistry
how do you calculate the quantity of heat gained or lost? 0.60 mol of steam condenses at 100C
May 25, 2011 by Emily

chemistry
Calculate the final temperature of 289 of water initially at 35 upon absorption of 20 of heat.
October 7, 2011 by jasmin

chemistry
a sample of iron (35.0g) absorbs 5.50J. of heat. calculate the increase in temperature that occurs
November 3, 2011 by payton

Chemistry
Calculate the final temperature of 244 of water initially at 35 upon absorption of 20 of heat
February 5, 2013 by KJ

Chemistry
Calculate the heat in kilojoules needed to condense 185g of steam at 100 ∘C.
November 24, 2013 by Alex

Chemistry
Calculate the heat in kilojoules needed to condense 185g of steam at 100 ∘C.
November 24, 2013 by Alex

Chemistry
Calculate the heat in kilojoules needed to vaporize 8.00kg of water at 100∘C.
February 18, 2014 by Jacqueline

physics
1. Assume that 10 g of steam is added to 100 g of water initially at 19C. The water is inside an aluminum cup of mass 35 g. The cup is inside a perfectly insulating calorimetric container that prevents heat flow from the outside environment. Find the final temperature of the ...
December 5, 2013 by bano

physics
Assume that 10 g of steam is added to 100 g of water initially at 19C. The water is inside an aluminum cup of mass 35 g. The cup is inside a perfectly insulating calorimetric container that prevents heat flow from the outside environment. Find the final temperature of the ...
December 5, 2013 by bano

chemistry
calculate the volume of .1M HCl that is required to react with 50 mL of .1M ammonia to form a mixture that has pH 9
October 6, 2010 by maycee

chemistry
Calculate the mass of KI in grams required to prepare 7.00 multiplied by 102 mL of a 2.60 M solution
October 12, 2010 by Anonymous

science
Calculate the energy required to raise the temperature of 150.0 g Ag from 273 K to 291 K.
March 24, 2011 by AS

chemistry
Calculate the grams of substance required to prepare 250mL of 5%(wt/vol) NaNO3
September 22, 2011 by desperate for help

chemistry
Calculate the grams of K2CO3 required to prepare 546.0 mL of a 0.789 g/L K+ solution.
February 15, 2012 by donald

Chemistry
Calculate the grams of solute required to make 2500mL of 90% saline solution?
May 17, 2012 by Morgan

Chemistry
Calculate volume of 6MHCL required to prepare a 250 ml of a 0.15MHCL solution??
April 9, 2013 by Karen

Chemistry
Calculate volume of 6MHCL required to prepare a 250 ml of a 0.15MHCL solution??
April 9, 2013 by Karen

CHEMISRTY
Calculate the energy required to raise the temperature of 160.0 g Ag from 273 K to 295 K.
April 21, 2013 by Tonya

Math
The amount of a monthly electric bill (B, measured in $) depends on the amount of electricity used that month (E, measured in kWh). A typical public utility charges $0.12 per kWh for the first 300 kWh used, $0.17 per kWh for the next 600 kWh used, and $0.29 per kWh for any ...
December 4, 2012 by alice

Chemistry
55 kJ of heat are added to 200 kg of a metal at 28.00◦C and the temperature rises to 29.18◦C. What was the metal? 1. tungsten (specific heat = 0.134 J/g ◦ C) 2. copper (specific heat = 0.385 J/g ◦ C) 3. silver (specific heat = 0....
April 10, 2013 by Arturo

math
I need help with these two problems please. Completely factor the polynomial. 8x^3+16^2+8x+16 Factor the trinomial completely. y^3-14y^2+48y
March 24, 2013 by ashley

Chemistry (DrBob222)
Hi, here's my (almost) 2-paged lab report introduction (hopefully you remember it from yesterday). I went to class today, and actually a lot of my other classmates' introductions were over 2 pages! Now I'm feeling kind of insecure about mine, and I'm not even sure if 2 pages ...
February 19, 2013 by a Canadian

chemistry
Calculate the heat of formationof benzene if the heat of combustion of benzene is 3260 kj/mol, given the following enthalpies of formation of the product. enthalpies of formation for O2= 0k (element) enthalpies of formation CO2 = -394kj/mol enthalpies of formation H2O= -285 kJ...
July 18, 2011 by priya

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