# how much heat is required to melt an ice cube that is 4.2 cm x 2.1 cm x 2.9 cm? The density of ice is 0.92 g/cm3

22,259 questions, page 131
1. ## Chemistry

There is a problem that I am completely stuck on and it deals with thermochemistry, specifically on calculating the amount of heat released in a reaction. The question is, "how much carbon dioxide must be produced to release 1200.0 J of energy?" using the

asked by bm24 on May 9, 2018
2. ## Physics

A person eats a container of yogurt. The Nutritional Facts label states that it contains 195 Calories (1 Calorie = 4186 J). What mass of perspiration would one have to lose to get rid of this energy? At body temperature, the latent heat of vaporizaiton of

asked by Mitch on April 6, 2008
3. ## Physical Chemistry

Estimate the heat of the formation of each of the following molecules useing the bond dissociation energies provided (in KJ/mol) (a) NH3 (b) H2O (C) H2O2 D(NÎN)=944; D(H-H)=436; D(OÎO)=498; D(O-O)= 142; D(N-N)=391; D(O-H)=464 NB>all the brackets are foot

asked by VybzMachine on March 14, 2012

the enthalpy change when a strong acid is neutralized by base is -56.1 kJ/mol. If 135 ml of .450 M HI at 23.15 C is mixed with 145 of .500 M NaOH at 23.15 C What will the max temperature reached by the resulting solution? tamana: Assume the specific heat

asked by Jazmin on October 17, 2010
5. ## Chemistry 2

A United Nations toxicologist studying the properties of mustard gas, S(CH2CH2Cl)2, a blistering agent used in warfare, prepares a mixture of 0.675 M SCl2 and 0.973 M C2H4 and allows it to react at room temperature (20.0°C ). SCl2 (g) + 2 C2H4 (g) -->

asked by Anonymous on March 11, 2015
6. ## Physics

A 1900 kg Oldsmobile traveling south on Abbott Road at 13.6 m/s is unable to stop on the ice covered intersection for a red light at Saginaw Street. The car collides with a 3854 kg truck hauling animal feed east on Saginaw at 9.8 m/s. The two vehicles

asked by JAY Z on April 26, 2014
7. ## PHYSICS need help now!!!

A 66kg skater, at rest on frictionless ice, tosses a 6.0kg snowball with velocity by v=53.0i+14.0j m/s, where the x- and y- axes are in the horizontal plane.Find x-component (v_x) of the subsequent velocity of the skater.Find y-component (v_y) of the

asked by Jcota2 on October 26, 2012
8. ## chemistry

An ice-bath made with sodium chloride will be 9 ± 1 oC when the solution is about 23% sodium chloride by mass. The density of solid sodium chloride is about 2 g/cm3. What volume of solid NaCl would you add to 200 g water to make a 23% NaCl solution? ANY

asked by Jamie on February 13, 2014
9. ## math

A Cold Stone Creamery ice cream shop sells sundaes for \$3.60 and banana splits for \$4.25. The shop sells four times as many sundaes as banana splits. If total sales amounted to \$3,730 last weekend, how many banana splits were sold?

asked by Shea Collins on May 3, 2013
10. ## physics

An ice sled powered by a rocket engine starts from rest on a large frozen lake and accelerates at +40 ft/s2. After some time t1, the rocket engine is shut down and the sled moves with constant velocity v for a time t2. If the total distance traveled by the

asked by kinematics on February 11, 2008
11. ## Physics

A spring has a spring constant of 42 N/m. How much work is required to stretch the spring 1.5 cm from its equilibrium position?

asked by Kels on October 4, 2011
12. ## 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 andheated to a

asked by Thomas on March 30, 2008
13. ## chemistry

Problem#8: Metabolism of alcohol (ethanol, C2H5OH) by the body takes place according to the reaction: C2H5OH(l) + 3O2(g) → 2CO2(g) + 3H2O(l) ΔHo = -1367 kJ Determine the number of “food calories” (Cal) supplied by the alcohol in a 12-oz (355-mL)

asked by Sarah on October 21, 2010
14. ## chemistry

1(a) when 25.0ml of 0.500 mol.dm3 H2SO4(AQ) SOLUTION IS added to 0.025dm3 of 1.00 moldm3 KOH SOLUTION , THE TEMPERATURE OF THE REACTION MIXTURE RISES FROM 23.50 CELCIUS TO 30.17 CELCIUS . THE SPECIFIC HEAT CAPACITY AND DENSITY OF WATER 4.20j.g.celcius and

asked by mustafe on February 9, 2012
15. ## check 3 quick physic questions

Identify the areas of physics involved in each of the following tests of a lightweight metal alloy proposed for use in sailboat hulls: a. testing the effects of a collision on the alloy Would this be relativity since relativity includes particle

asked by Anonymous on August 22, 2006
16. ## Math

a man plans to build a teepee in the back yard for his children. The distance between the stays is 12 ft. the height to the top of the teepee is 8 ft. what is the length of pipes required for the teepee?

asked by Joann Paynter on November 28, 2010
17. ## Calc II

A worker on scaffolding 65 ft above the ground needs to lift a 390 lb bucket of cement from the ground to a point 20 feet above the ground by pulling on a rope weighing 5 lb/ft. How much work is required?

asked by Liz on October 16, 2012
18. ## physics

given that the mass of an electron is 9.1 x 10^-28 grams and the charge on an electron is 1.6 x 10^-19 Coulombs, calculate the voltage required to lift an electron 5 cm. the question was previously answered, but I did'nt understand it .. could some show me

asked by Martin on May 19, 2012
19. ## Finance

RCA made a coupon payment yesterday on its 6.25% bonds that mature in 11.5 years. If the required return on these bonds is 9.2% nominal annual, what should be the market price of these bonds?

asked by Anonymous on November 29, 2010
20. ## CHEMISTRY

Zinc metal reacts with hydrochloric acid to produce zinc (II) chloride and hydrogen gas. what volume (in mL) of 2.0M HCl is required to dissolve a 10.0g piece of zinc?

asked by Jon on March 13, 2011
21. ## CHEMISTRY

Zinc metal reacts with hydrochloric acid to produce zinc (II) chloride and hydrogen gas. what volume (in mL) of 2.0M HCl is required to dissolve a 10.0g piece of zinc?

asked by Jon on March 13, 2011
22. ## chemistry

When hydrochloric acid reacts with magnesium metal, hydrogen gas and aqueous magnesium chloride are produced. What volume of 4.8 M is required to react completely with 2.60 g of magnesium?

asked by Anonymous on January 19, 2015
23. ## FIN

Phoenix, Inc made a coupon payment yesterday on its 6.25% bonds that mature in 11.5 years. If the required return on these bonds is 9.2% nominal annual, what should be the market price of these bonds?

asked by willie on April 4, 2011
24. ## chemistry

the concentration of a chemical degrades in water according to order kinetics. the degradation constant is 0.2 day^-1. if the initial concentration is 100.0 mg/L, how may days are required for the concentration to reach 0.14 mg/L?

asked by Maria on January 15, 2011
25. ## physics

A worker on scaffolding 75 ft above the ground needs to lift a 410 lb bucket of cement from the ground to a point 25 feet above the ground by pulling on a rope weighing 5 lb/ft. How much work is required

asked by Anonymous on October 15, 2014
26. ## science

lunar probes: what else does a lunar probe have other than a camera? i need to know today becasue it is for aproject and it is due tomorrow please help!!!!!! You will find a description of some of the first lunar probes that actually landed on the moon at

asked by gabby on March 18, 2007
27. ## Chemistry

I am having trouble getting the right answer for this question please help. Calculate Kc for the FeSCN2+ formation equilibrium [FeSCN2+] = 3.49x10^-5 M [Fe3+] = 4.39x10^-4 M [SCN-] = 1.93x10^-4 Kc = [FeSCN2+] / ([Fe3+]-[FeSCN2+]) * ([SCN-] - [FeSCN2+]) I

asked by Amanda on March 20, 2017
28. ## physics

Bob, who has a mass of 80kg , can throw a 550g rock with a speed of 27m/s . The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 m. What constant force must Bob exert on the rock to throw it

asked by Justin on October 30, 2014
29. ## gegraphy

the native people originally come from? the name of the ethnic ground that settles in the praires? the porcess that formed the rocky mountains and appalachians? the most valuable catch in the pacific? the most eastern and western physiographic region? the

asked by Ted on June 12, 2010
30. ## Social Studies

Why did the House of Representatives impeach President Johnson? a- He had not been elected by the voters. b-He had fired the Secretary of War illegally. c-He had appointed temporary southern governors. d-He had required states to approve the Thirteenth

asked by Lily on December 7, 2018
31. ## Physics

What is the average braking force required of a 1200kg car in order for it to come to rest from 60km/h in a distance of 25m Physics - Damon, Monday, September 1, 2014 at 6:51am Vi = 60 km/h (1 h/3600 s)(1000 m/km) v = Vi + a t 0 = Vi + a t t = -Vi/a d = Vi

asked by Abdul on September 1, 2014
32. ## Creative Writing

I am working on an oral presentation on Dorothy Parker for my creative writing class. I am required to focus on her non-fiction work. I have researched her endlessly and have come up with nothing. Everything that I am finding concerns her poems and short

asked by Einstein on November 24, 2008
33. ## Chemistry

If the radiation of an automobile contains 12L of water, how much would the freezing point be lowered by addition of 5 kg of prestone (glycol, C2H4(OH2))? How many kg of zerone (methyl alcohol, CH3OH) would be required to produce the same result? assume

asked by ray on March 6, 2010
34. ## physics

particle P and Q are undeergoing uniform horizotal circular motion along concentric circle of different radii in clockwise sense . pcomplete each round in 2 min while q does in 5 min. time required by q to make one revolution around P

asked by satya on January 27, 2017
35. ## Physical science

A chair lift holding a 100 kg man rises 5 meters in height in 10 second time period. Ignore the weight of the chair and related machinery and answer the following: How much power is required, in Watts?

asked by Dina on October 23, 2010
36. ## physics

The flywheel of an engine has a moment of inertia of 24 kg*m^2. a) if the radius of the wheel is 0.6m, what force is required to accelerate the wheel from rest to an angular velocity of 300 rpm in 6 seconds? b) how many turns does it make during this time?

asked by Natasha on December 12, 2012
37. ## Regents biology

Baby chickens require a constant source of food.As chick's grow,more energy is required for daily activities.The following table gives the grams of food eaten by a chuck over a five day period:

asked by Jorge on October 21, 2015
38. ## Language/Listening Skills

Would (D) be the best answer for this question? Listening activities should be: A. on the floor,in a corner of the room. B. in a large area for children to have space and feel comfortable. C. required of all students D. in a small area with the least

asked by Shannon Beth on September 7, 2007
39. ## physics

The flywheel of an engine has a moment of inertia of 24 kg*m^2. a) if the radius of the wheel is 0.6m, what force is required to accelerate the wheel from rest to an angular velocity of 300 rpm in 6 seconds? b) how many turns does it make during this time?

asked by Natasha on December 12, 2012
40. ## mathematics

what does 'dx' signify in the integral and differentiation notation? I was reading integration by substitution method where it is required to replace 'dx' and change the independent variable such that the integral could be transformed.I have read in

asked by Arvind on December 26, 2013
41. ## physics

A 68.0 kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.700 and 0.450, respectively. (a) What horizontal pushing force is required to just start the crate moving?

asked by dee on February 23, 2012
42. ## physics => really need help on 2 problems (#1)

A house has well insulated walls. It contains a vol of 100m^3 of air at 300K a) calculate the E required to increase the T of the diatomic gas by 1.00C b) If this E could be used to lift an object of mass m through a height of 2.00m what is the mass of m?

asked by ~christina~ on March 26, 2008
43. ## Physics

A 5.o kg box is lifted to a height of 10 meters at a constant speed. a)How much power is required to complete this task in 10 seconds? b)Calculate the velocity of the box just as it hits the ground? i have the answers but i need a second opinion a)50 watts

asked by Mexico on April 6, 2011
44. ## Physics

A 5.o kg box is lifted to a height of 10 meters at a constant speed. a)How much power is required to complete this task in 10 seconds? b)Calculate the velocity of the box just as it hits the ground? i have the answers but i need a second opinion a)50 watts

asked by Mexico on April 6, 2011
45. ## physics

A 130 N block rests on a table. The suspended mass has a weight of 63 N. 130 N 63 N µs a) What is the magnitude of the minimum force of static friction required to hold both blocks at rest? Answer in units of N

asked by Anonymous on October 25, 2012
46. ## Personal Dimensions of Education

Which is the correct form of the verb provided to correctly complete the sentence. Either the additional resources provided or the textbook _____ the information required to respond appropriately to this week’s discussion prompt. 1)has 2)have

asked by ACE on February 16, 2014
47. ## carpentry, math

Determine the number of board feet required for joists on a one-story house 30′ × 40′, in which 2 × 8 joists will be placed 16″ OC. A. 2,052 B. 1,224 C. 1,632 D. 1,536 I honestly don't know what formula to use for this. Everything I see online

asked by doug on November 18, 2018
48. ## Math

In evening my test plz help me to solve it A room length 3m,20m wide and 6m height. Find the floor is to be tiled.if each tile measures 60cm*50cm,find the no. Of tiles required.

asked by Simon on February 6, 2013
49. ## chemistry

The solid oxide of generic metal M is added to 75 mL of water and reacts to produce a basic solution that is 0.20 M in the resulting compound. Neutralization of the solution required titration with 27 mL of 0.56 M HCl. How many valence electrons must M

asked by ellie on March 2, 2013

A skier of mass 71 kg is pulled up a slope by a motor-driven cable. The acceleration of gravity is 9.8 m/s2. How much work is required to pull him 64.6 m up a 33.8 slope (assumed to be frictionless) at a constant speed of 2.53 m/s? Answer in units of kJ

asked by Ashley on March 26, 2012
51. ## Calculus-Applied Optimization Quiz Problem

A rancher wants to fence in a rectangular area of 23000 square feet in a field and then divide the region in half with a fence down the middle parallel to one side. What is the smallest length of fencing that will be required to do this?

asked by Riley on October 31, 2013
52. ## Physics

Ok guys, state the surface powers required to produce the following lenses with +5.75D front curves. a) -0.50DS b) +0.50DS c) +1.75DS d) -1.25DS i'm not sure if it's as straight forward as calculating the difference, eg. a) +5.75 - -0.50 = +6.25. Any help

asked by Any.help.REALLY.appreciated on November 4, 2013
53. ## physics

A wire of length 60cm and mass 10kg is suspended by a pair of flexible leads in a magnetic field magnitude and direction of the current required to remove the tension in the supporting leads.

asked by Mztura on December 5, 2016
54. ## HISTORY

WHICH WOULD BE THE BEST CHOICE The U.S. Congress is 1 the only democratically elected legislature in the world. 2 prohibited from passing laws that might conflict with state laws. 3 required to reapportion every year. 4 nonpartisan. 5 bicameral. i CAN NOT

asked by CARNITA on November 11, 2010
55. ## account

Required: JZ is a musician who is considering whether to independently produce and sell a CD. JZ estimates fixed costs of \$10,000 and variable costs of \$4.00 per unit. The expected selling price is \$12 per CD. What is JZ's break-even point in units and

asked by 55 on February 2, 2014
56. ## chemistry

Chromium metal can be plated onto an object from an acidic solution of dichrmonate tions. What average current is required to plate 17.8 g of chronium metal in a time of 2.20 h? ( you will need to construct your own equation for the half-reaction)

asked by Amandeep on April 23, 2008
57. ## Physics

A hydraulic jack is designed so that when the handle is pushed down 1 m, the piston raising the load moves up 0.015 m. IMA= 66.67 AMA= 26.67 Efficiency= 40% At this efficiency, what is the force required to lift a 5000 N weight?

asked by Zach on February 9, 2012
58. ## chemistry

Oxygen gas reacts with powdered aluminum according to the following reaction: 4Al(s)+3O2(g) yields 2Al2O3(s) What volume of gas (in L), measured at 770 mmHg and 35 degrees C, is required to completely react with 53.9g of Al?

asked by rusty on March 8, 2009
59. ## physics

Consider the system shown in the figure with = 9.5 and = 15.0 . The angles = 59 and = 32. 1)In the absence of friction, what force would be required to pull the masses at a constant velocity up the fixed inclines? the force is now removed. What is the

asked by Austin on September 29, 2010
60. ## statistics

11. Suppose we are estimating m. What happens to the required sample size as the population standard deviation increases while the confidence level and desired margin of error remain constant? A) It increases. B) It decreases. C) It does not change.

asked by ali awan on May 8, 2013
61. ## physics

A hydraulic jack is designed so that when the handle is pushed down 1 m, the piston raising the load moves up 0.015 m. IMA= 66.67 AMA= 26.67 Efficiency= 40% At this efficiency, what is the force required to lift a 5000 N weight?

asked by Jacqueline on February 8, 2012
62. ## Physics(friction)

Find the coefficient of friction between a 73kg cubic box measuring 3m and a hardwood floor 16m long and 20m wide if a total of 236N is required to start the box moving.

asked by Pete on November 11, 2014
63. ## English

Words left beacon celestial detract precaution retaliate sham uncouth wistful 17.Before we use the blowtorch in our industrial arts class we are required to take the ___ of wearing goggles precaution

asked by Jerald on April 25, 2013
64. ## Chem 2

A 375-gallon tank is filled with water containing 167grams of bromine in the form of Br- ions. How many liters of Cl2 gas at 1.00 atm and 20C will be required to oxidize all the bromide to molecular bromine?

asked by Kerstin on May 6, 2012
65. ## Physics help!

Heat is added to an open container of a liquid. The liquid is brought to its boiling point and half the liquid boils away. Which of the following graphs shows how the temperature changes with this time period? Would the graph be just an ascending line?

asked by sophie on April 3, 2009
66. ## chemistry

Find for this reaction as written. (Use 1.0 for the density of the solution and 4.18 as the specific heat capacity.) When 0.129 of is combined with enough to make 53.8 of solution in a coffee-cup calorimeter, all of the zinc reacts, raising the temperature

asked by dtost on April 15, 2012
67. ## Lab Equipment

What is a square mesh with a fiber center used for support? 9 letters, ends with an E What is a porcelain container used to heat things? 8 letters, second letter is "R" What type of bottle is used for storing acids and bases? 7 letters, _E_G_ _T Help?

asked by Matt on January 29, 2008
68. ## CHEM UNI

2. In a calorimetry experiment, 50.0 g of a 2.04 mole/kg HCl solution is mixed with 50.0 g of a 2.13 mol/kg NaOH solution. The specific heat of the resulting solution is 3.90 J·˚C−1·g−1. The temperature of the mixture rises from 22.1 ºC to 37.0

asked by Carmin on February 6, 2015
69. ## Chemistry

Naoh (aq) + HCl (aq) --> NaCl (aq) + H2O (l) Using the dT determined in part 1, calculate the heat capacity of the calorimeter. Enthalpy of reaction= -58.3 kj/mol, Cs (NaCl = 3.91j/g C)density of 1 M NaCl = 1.037g/mL. dT= 12.88 degrees Celcius.

asked by Annie on November 12, 2012
70. ## Physical Science

A long distance swimmer, who is very cold, m=100 kg., 1000 kilocalories are supplied to warm them up. The specific heat for a human is 0.83. A) What will be the temperature change? B) If the original temperature is 85 degrees, find the final temperature.

asked by Bonni on October 20, 2014
71. ## physics

A lump of lead with a mass 0.5kg is dropped from a height of 20m onto a hard surface. It does not rebound but remains there for a long time. A) what is the increase in heat B)what is the increase in internal energy C)what is the increase in temperature

asked by Asteway on July 19, 2017
72. ## science

Which of the statements below are true? a) The surface of the sun is over 10,000 degrees F B) The sun is hot enough to heat the earth and give light to the planets c) The sun will continue to burn for at least another 5 billion years d) all of the above

asked by ant on August 18, 2010
73. ## Chemistry

Charcoal is primarily carbon. Determine the mass of CO_2 produced by burning enough carbon (in the form of charcoal) to produce 510 kJ of heat. C + O2 --> CO2 Delta H = -393.5 kJ

asked by Lynn on March 19, 2012

For an experiment on specific heat capacities my data for measured specifi heats was consistently higher than the accepted values. I am not sure why this is. Would it be because my initial temperature that I started the experiment with was higher than it

asked by Hannah on November 3, 2012
75. ## Chemistry

Nitroglycerin C3H5(NO3)2 is a common explosive which decomposes according to the equation. 4C3H5(NO3)2 - 12CO2 + 10H2O + O2 +6N2 ΔH= -5.720*10^3 KJ. Calculate the heat for the decomposition for the 10.6g of the Nitroglycerin.

asked by Wendy on August 28, 2018
76. ## Chem

The actual heat of formation of MgO is -601.8 kJ/mol. Convert this to kcal/mol and calculate your % error. And list two possible sources of procedural error to account for this percentage.

asked by Danny on March 18, 2012
77. ## PHYSICS

Bricks have a thickness of 12 cm, if an external wall of the house measures 10 mx 15m, calculate the rate of heat exchange through this wall if the inside temperature is 200C and the outside temperature is 50C.

asked by Jane on April 10, 2013
78. ## Physics

A person heats up a can of soup on a stove. If he does 250 Joules of work on the soup by stirring it as the burner adds 1675 Joules of heat, what is the change in its internal energy

asked by Tracy on March 3, 2012
79. ## physics

A 24V battery of internal resistance of 10ohms is connected to a variable resistor. At what value of current drawn from battery the rate of heat produced by the resistor is maximum? Hence find its value.

asked by Edwin on March 16, 2010
80. ## Physics

A person heats up a can of soup on a stove. If he does 250 Joules of work on the soup by stirring it as the burner adds 1675 Joules of heat, what is the change in its internal energy?

asked by GRISSELL on March 3, 2012
81. ## chemistry

A small “coffee cup” calorimeter contains 110. g of H2O at 22.0°C. A 100. g sample of lead is heated to 90.0°C and then placed in the water. The contents of the calorimeter come to a temperature of 23.9°C What is the specific heat of lead?

asked by Joseph on August 3, 2010
82. ## chemistry

In the lab, an experimenter mixes 9.0 g of water (initially at 23.4°C) with 80 g of a solid metal (initially at 350°C). At thermal equilibrium, he measures a final temp of 55.4°C. What must the specific heat of the metal be?

asked by victoria on May 26, 2015
83. ## chem

A small “coffee cup” calorimeter contains 110. g of H2O at 22.0°C. A 100. g sample of lead is heated to 90.0°C and then placed in the water. The contents of the calorimeter come to a temperature of 23.9°C What is the specific heat of lead?

asked by gaby on August 17, 2010
84. ## chemistry

Posted a question earlier but it was the wrong question. If anyone could help it would great if you could explain this would help also. Thanks ^ = subscript Calculate ke for(equlibrium concentration below problem 2CO^2(g) + heat 2CO(g) + O^2 [0.103]

asked by Shanta on January 5, 2010
85. ## Chemistry

A 2.25 g sample of hydrazine, N2H4, is burned in a bomb calorimeter that contains 6,402.45 g of H2O, and the temperature increases from 25.00° C to 26.17° C. The heat capacity of the calorimeter is 3.64 kJ/° C. Calculate Delta E for the combustion of

asked by Jordin on October 13, 2010
86. ## chemistry

Calculate the change in internal energy of the system in a process for which 100J of heat is absorbed by the system from surroundings and does 85J of work. (I want to learn the solution on how to calculate it... pls. help thank you... )

asked by jaycab on January 23, 2011
87. ## Chemistry

Which of the following has no effect on the rate ofa reaction? a)degree of branching or size of reactant molecules b)value of Heat of reaction c)presence of a catalyst d)temperature of the reactants e) concentrations of the reactants

asked by Mike on September 17, 2016
88. ## Physics

How much heat energy is needed to change 0.25kg of water at 100°C to steam at 100°C? Show your work. Please don't give me the answer, I just need help figuring out how to find the answer. Thanks!

asked by Mark on December 7, 2016
89. ## Chemistry

how many moles of O2 would be needed to produce 1120.5 kJ of heat from the reaction: 3Fe + 2O2 yields Fe3O4+ 1120.5 kJ I got 627771.33 which I thought seemed a bit too high. My proportion was 1120.5=2 O2/1120.5. Thanks again.

asked by Tabetha on May 19, 2009
90. ## Science 9

2.0kg block of iron transfers 180,000j to the atmosphere around it. If its initial temperature was 350 celius what is it's final temperature? If you know the specific heat of iron, you can use Q = mc(delta T).

asked by Ruby on December 30, 2006
91. ## Chemistry

Ethanol, C2H5OH, is mixed with gasoline and sold as gasohol. Use the following to calculate the grams of ethanol needed to provide 367 kJ of heat. C2H5OH(l) + 3 O2(g) ¨ 2 CO2(g) + 3 H2O(g) ƒ¢H = −1235 kJ

asked by Samantha on November 21, 2011
92. ## Gateway

I have 10g of magnesium oxide that I heat to make 6g of magnesium and oxygen. how much oxygen is made? What kind of change is this, physical or chemical? why did you pick your answer? Explain in 2 sentences

asked by Zykeriah on September 14, 2016
93. ## Physics

Let 70.0 J of heat be added to a particular ideal gas. As a result, its volume changes from 65.0 cm3 to 169.0 cm3 while the pressure remains constant at 1.7 atm. By how much did the internal energy of the gas change?

asked by Shane on April 19, 2015
94. ## Physics

An ideal gas heat engine operates in a Carnot Cycle between temperatures of 266 and 115°C. It absorbs 4250 cal per cycle at 266°C. What is its efficiency as a percentage?

asked by Riley on February 3, 2014
95. ## Physics

An electric rod of 2000 watts rating boils a certain quantity if water in 10 minutes, the heat is generated for boiling this water is? answer is 12 X 10^5 Joules, but I cant solve it please solve it

asked by Shahab Mirza on October 2, 2014
96. ## Physics

An ideal gas heat engine operates in a Carnot Cycle between temperatures of 266 and 115°C. It absorbs 4250 cal per cycle at 266°C. What is its efficiency as a percentage

asked by Chelsea on January 31, 2014
97. ## Chemistry

Propane, C3H8, is a common fuel gas. Use the following to calculate the grams of propane you would need to provide 369 kJ of heat. C3H8 (g) + 5O2 (g) --> 3CO2 (g)+ 4H2O (g) ; Delta H = -2043kJ

asked by Anonymous on November 5, 2011
98. ## Physics

Heat of 30 kcal is supplied to a system and 4200j of external work is done on the system so that it's volume decreases at constant pressure.what is the change in its internal energy (J=4200 j/kcal)

asked by Shaik Tanaaz on August 18, 2016
99. ## Physics

A 5.00-grain aspirin tablet has a mass of 320 mg. For how many kilometers would the energy equivalent of this mass power an automobile? Assume 12.75 km/L and a heat of combustion of 3.65x10^7 J/L for the gasoline used in the automobile.

asked by Brian on December 15, 2012
100. ## Science

Solid cupric chlorate decomposes with heat to give cupric chloride and oxygen gas. Express your answer as a chemical equation. Identify all of the phases in your answer.

asked by first on March 24, 2019