# 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 125
1. ## Integrated Physics and Chemistry

Which of the following would by the best conductor of heat energy? A)a plastic spoon B)a wooden spoon C)a metal spoon

asked by Ashley!! on April 21, 2011
2. ## Chemistry

You isolate an acidic compound in an experiment by first separating it from the organic layer. Then you have a solution containing a salt of an acid. You acidify it using concentrated HCl. A precipitation begins to form while the solution is still basic..

asked by Rachel on October 23, 2011

A figure skater stands on one spot on the ice(assumed frictionless) and spins around with her arms extended. When she pulls in her arms, her moment of inertia decreases to 3/4 of the initial value. Assume that her spin angular momentum is conserved. What

asked by rosa on November 11, 2013
4. ## Chemistry

If the initial concentration of NH3(g) is 4.643 mol/L, calculate the % of NH3(g) left over after the reaction reaches equilibrium according to the balanced equation. The value of Kc at 773.0 K is 16.70. The initial concentration of the reaction products is

asked by j on December 3, 2011
5. ## Physics

A player strikes a hockey puck giving it a velocity of 47.673 m/s. The puck slides across the ice for 0.175 s after which time its velocity is 46.473 m/s. The acceleration of gravity is 9.8 m/s2 . The mass of the puck is 185 g. If the puck strikes the

asked by Mike on January 9, 2011
6. ## physics

A 56.0 ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.00 turns each second. The distance from one hand to the other is 1.5 . Biometric measurements indicate that each hand typically makes up about

asked by steph on November 8, 2010
7. ## Physical Chemistry

Your hot tub has overheated to a very uncomfortable 48 degrees C. If your hot tub contains 402 L of hot water, what mass of ice at -5 degrees C would you need to add to your hot tub to bring the temperature down to a more comfortable 36 degrees C?

asked by Matt on September 29, 2017

Letter to the editor: “Once again the Park Commission is considering closing North Park Drive for the sake of a few joggers and bicyclists. These so-called fitness enthusiasts would evidently have us give up to them for their own private use every last

asked by categorizing fallacies on December 3, 2008
9. ## college

5. Letter to the editor: “Once again the Park Commission is considering closing North Park Drive for the sake of a few joggers and bicyclists. These so-called fitness enthusiasts would evidently have us give up to them for their own private use every

asked by Anonymous on October 31, 2009
10. ## physics

A copper Calorimeter of mass 150g,was half-filled with water of mass 300g and a temperature of 0°C.5g of ice of mass 0°C was added to the content, later some quantity of steam was passed into the mixture and the temperature rose by 20°C. Calculate the

asked by oluwasegun on August 17, 2015
11. ## Physics

A faulty celcius thermometer read 0.7 degree celcius at the melting point of pure ice and 99.5 at the boiling point of water at normal pressure. Calculate the correct temperature when it reads 30 degree celcius. At what temperature will its reading be

asked by Shredder on January 25, 2016
12. ## physics

A copper Calorimeter of mass 150g,was half-filled with water of mass 300g and a temperature of 0°C.5g of ice of mass 0°C was added to the content, later some quantity of steam was passed into the mixture and the temperature rose by 20°C. Calculate the

asked by tony on December 13, 2017
13. ## Chemistry

Consider the reaction: 2Mg + O2 ------> 2MgO The reaction is at equilibrium, the concentration of MgO is found to be 0.5. What is the concentration of Mg and O2? ------------------------------------------------------- Keq is not given... using the ICE

asked by Annie on June 29, 2015
14. ## Chemistry

Consider the reaction: 2Mg + O2 ------> 2MgO The reaction is at equilibrium, the concentration of MgO is found to be 0.5. What is the concentration of Mg and O2? ------------------------------------------------------- Keq is not given... using the ICE

asked by Annie on June 29, 2015
15. ## Physics

Suppose two blocks of ice are heading toward each other. block A has a mass of 4.24 kg and is traveling at 2.24 m/s. Block B has a mass 4.42 kg and is traveling at 2.24 m/s in the opposite direction. After the collision they are traveling in the same

asked by Mayte on November 14, 2010
16. ## chemistry

a gas sample heated in a cylinder uses 650kJ of heat. a piston that compresses this gas does 800kJ of work. What is the change in internal energy, ^E of the gas during this process?

asked by harry on February 12, 2013

Calculate the Calorimeter Constant (Ccal) if 25.00 g of water at 51.50°C was added to 25.00 g of water at 25.00 °C with a resulting temperature of 35.00 °C? (*remember the specific heat capacity of water (cwater) = 4.180 J/g°C)

asked by Mary on June 25, 2013
18. ## physical science

A 12-kg iron ball is dropped onto a pavement from a height of 90m. Suppose half of the heat generated goes into warming the ball. What is the temperature increase of the ball in degree C

asked by martha on October 6, 2013
19. ## Science

How much heat is absorbed by a persons hand if 100 grams of steam at 100°C is first converted to liquid water at 100°C and then cooled to normal body temperature?

asked by Anonymous on July 13, 2011
20. ## chemistry

Water (2690 ) is heated until it just begins to boil. If the water absorbs 5.29×105 of heat in the process, what was the initial temperature of the water?express answer in Celsius.

asked by Kyle on September 20, 2010
21. ## Physics

Suppose you put a 100 W light bulb in a container of water and use it to heat the water. How long would it take to raise the temperature of a gallon of water at 25 C to 90C? Please explain!

asked by Kpang on December 11, 2012
22. ## chemistry

10.5 g sample of copper metal at 25.0°C is heated by the addition of 150.0 J of energy. The final temperature of the copper is _____°C. The specific heat capacity of copper is 0.38 J/ goC.

asked by jennifer on June 29, 2015
23. ## AP Chemistry

Which of the following properties can be attributed to hydrogen bonding? 1. high melting point 2. high heat of vaporization 3. low vapor pressure 4. high surface tension a. 1 and 3 b. 2 and 3 c. 2, 3, and 4 d. 1, 3, and 4 e. 1, 2, 3, and 4

asked by Joe on April 4, 2008
24. ## Physics

The temperature of a monatomic ideal gas remains constant during a process in which 4500 J of heat flows out of the gas. How much work (including the proper + or - sign) is done on the gas? J

asked by Pierre on April 19, 2008
25. ## Science

500g of water at 100°c is mixed with 300g of water at 20°c.specific heat capacity of water is 4.2Jg°c.find the final temperature of mixture. (Physics)

asked by Rahul on September 5, 2016
26. ## math question

how do i do a problem like this becuase i got it wrong on my study guide and i want to know how to do it? A number cube is rolled 450 times.The number 3 comes up 67 times. a.What is the theoretical probability of rolling a 3? write your answer as a

asked by matt on June 6, 2014

Three forces act on a hockey puck as it slides across the ice, and it is in equilibrium. The force F is applied at the center and has a magnitude of 25 N. The force F1 is applied at the top edge, and F2 is applied half way between the center and the bottom

asked by Hannah on June 5, 2012
28. ## Chemistry

Determine the molar solubility of Y for XY2 if Ksp is 2.2x10^-4. The 2 in Xy2 is a subscript. I found the Ksp equation which is ksp=[x^2+][Y^-]^2 Then I did the ICE table and got x and 2x for the equilibrium concentrations. Then I did: 2.2x10^-4=(x)(2x)^2

asked by Sara on May 12, 2015
29. ## physics

A puck of mass 5.0 kg moving at 16.5 m/s approaches an identical puck that is stationary on frictionless ice. After the collision, the first puck leaves with a speed v1 at 30º to the orginal line of motion. The second puck leaves with speed v2 at 60º.

asked by alex on February 26, 2012
30. ## physics

A puck of mass 5.0 kg moving at 16.5 m/s approaches an identical puck that is stationary on frictionless ice. After the collision, the first puck leaves with a speed v1 at 30º to the orginal line of motion. The second puck leaves with speed v2 at 60º.

asked by alex on February 26, 2012
31. ## Physics

A man standing on very slick ice fires a rifle horizontally. The mass of the man together with the rifle is 70 kg, and the mass of the bullet is 10g. Q:If the bullet leaves the muzzle at a speed of 500 m/s, what is the final speed of the man? I don't know

asked by falcon306 on August 6, 2011
32. ## Chemistry

What is the final temperature and physical state of water when 250 grams of water at 85 degrees C is added to 80.0 grams of ice at -15 degree C? Is the physical state of water liquid? I don't understand the set up that I have to set the equation equal to 0

asked by Student on February 29, 2016
33. ## Physics

Which of the following involves a non-zero net force? I. A hockey-puck sliding at a constant speed on ice. II. The earth revolving around the sun at a constant speed. III. An object falling near the surface of the earth. A) I only B) III only C) Both I and

asked by Astrogirl on October 13, 2011
34. ## Chemistry

assume equal masses of the following substances, all of them at 20.0 degrees C and exposed to the same source of heat simultaneously. Which substance will reach a temp of 35.0 degress faster? aluminium sp 0.900 lead sp 0.128 titanium sp 0.523 tin sp 0.222

asked by RoseBud on April 28, 2012
35. ## Science

What happens to sunlight when it strikes a dark (black) surface? How is wavelength affected? Why are the Sun's rays the most powerful in the summer solstice and why is this not the hottest time of the year. What frequencies or color of light are most

asked by Bob on May 8, 2008
36. ## chemistry

How to find delta H using calorimetry?? I know the answer but I m having trouble getting there!? 5.5 grams of C2H6 are burned in a bomb calorimeter with the heat of 4.96kJ/degree Celsius and holds 1000g of H20. the change in temperature is 11.34 which i

asked by homework on December 18, 2017
37. ## Chemistry

How do you work this one problem? Metal Specific Heat (J/g-C) Al (s) 0.900 Au(s) 0.129 Cu(s) 0.385 Fe(s) 0.444 Hg(l) 0.139 H2O(l) 4.184 C2H5OH(l) 2.46 Using the above table, determine the final temperature if 713.6J is released from a 48.2g sample of

asked by christine on October 24, 2010
38. ## English

We are reading the book In the Heat of the Night by John Ball and I need to complete the chapter 2 comprehension questions. I am stuck on this one: 1. Investigate the figurative nuances of the name Virgil. It is an allusion. Why is it significant? Think in

asked by Bethany on March 1, 2014
39. ## biolgy

The desert tortoise digs a burrow and hides in it during the day to stay cool, because of the extreme heat aboveground. Which characteristic of life does this behavior best illustrate? A.response B.metabolism C.cellular organization D.growth and

asked by woe on September 4, 2015
40. ## Chemisty - Unsure how to proceed- Combustion rxn

Question as follows: If you combusted 23g of ethanol with an excess of oxygen how much heat would be released or absorbed? the only thing I've deduced is the chemical reaction: C2H6O + 302 -> 3H20 + 2C02 I'm not sure how to proceed. I need Q. Not sure

asked by Angely R. on March 21, 2014
41. ## physics

two road of equl lenght have same tempeities are differentce between thir ends.if their thermal conductivities arek1 ANDK2 and their areas of cross section are A1 AND A2 respectively find the conditionthat will ensure equil ratess of flow of heat through

asked by Anonymous on May 23, 2013
42. ## Chemistry

Estimate the standard heat of formation of one of the basic buildin block of life, the amine acid glycine. (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

asked by VybzMachine on March 14, 2012
43. ## english

Click on the box to choose whether each sentence restates the key idea expressed in the key sentence. Key Idea: When hot weather arrives and the nation takes to the outdoors, mishaps multiply. Drowning is the fourth most frequent cause of accidental death

asked by Perla on April 30, 2013
44. ## physics

A block and a tackle system of 4 pulley is used to raise 150g vertically upward if the efficiency is 80% determine the minimum effort required to raise the load if g=10ms-2

asked by Esther on February 6, 2018
45. ## Representing Text

If a term paper consisted 42 pages, each containing 40 lines of 100 symbols each (counting each space as a symbol), was to be encoded using Unicode, how many bytes of storage space would be required?

asked by lj on April 5, 2011
46. ## physics

the floor of a lorry is 3m high, a plank 5m longis used as an inclined plan to raise some leading the maximum effort required to raise 200N load up the plane

asked by mike on June 13, 2017
47. ## SOC 302

An Environmental Impact Statement (EIS) is a/an A:assessment required by National Environmental Policy Act (NEPA) to demonstrate that a proposed project does not harm the environment.

asked by Lovely34 on November 13, 2017
48. ## Chemistry

Answer the questions about the following reaction. 4Al(s) + 3O2(g) 2Al2O3 (s) How many molecules of O2 are used in the reaction? How many oxygen atoms are required? How many moles of Al2O3 are formed? What is the mole ratio of Al to O2?

asked by Raven-Sierra on November 30, 2016
49. ## physics

a trolley of mass 40kg us pushed up a hill of height 10m at an angle of 20 degree. calculate the force required to reach this height. how do i complete this question?

asked by jordan on September 25, 2014
50. ## Chemistry

3. Using Bohr’s model of the atom, calculate the energy required to move an electron from a ground state of n = 2 to an excited state of n = 3. Express your answer in both J/photon and kJ/mol.

51. ## st.xavier

Determine the horizontal force P required to start the movement of the 200 lb blockup the 300inclined surface. The static coefficient of friction between the inclined surface and the block is ms = 0.25.

asked by pankaj on September 16, 2013
52. ## physics

A pulley system of 4 pulleys is used to raise a loan of mass 50kg vertically,if its effeciency is 80%,determine the minimum effort required to raise the load(g=10ms-2)?

asked by Abba on March 16, 2017
53. ## math

the space in front of a temple is of length 12 metres and breadth 9 meters .on this space,square tiles 75cm are to be fitted find the number of titles required

asked by aarish on November 23, 2010
54. ## PHYSIC

What current is required in the winding of a long solenoid that has 1000 turns uniformly distributed over a length of 0.4 m, to produce at the center of the solenoid a magnetic field of magnitude 1.0 x 10 -4 T?

asked by KAIT on September 3, 2011
55. ## PHYSIC

What current is required in the winding of a long solenoid that has 1000 turns uniformly distributed over a length of 0.4 m, to produce at the center of the solenoid a magnetic field of magnitude 1.0 x 10 -4 T?

asked by KAIT on September 3, 2011
56. ## math

0.224g sample that contained only bacl2 and kbr required 19.7ml of 0.1M agn03 to react the end point. Calculate the percent of each compound present in the sample

asked by Fai on December 21, 2013
57. ## Physics

What minimum force is required to drag a crate (m = 40 kg) across a floor (co-efficient of kinetic friction = 0.6) if the force is applied at a 45 degree angle upward from the horizontal? Help ASAP please!!

asked by Anonymous on October 13, 2016
58. ## chemistry

What is the molarity of a sulfuric acid solution if 30.00mL of H2SO4 is required to neutralize 0.840g of sodium hydrogen carbonate? H2SO4(aq) + NaHCO3(aq) → Na2SO4(aq) + H2O(l)+ CO 2(aq)

asked by shane on December 4, 2012
59. ## Spanish

Hi, I would like some tips on what to say when you're talking to a friend about what you're packing & need to buy to go on a trip. This is a conversational piece where it is required that we speak out of context as well (talking about the weekend,

asked by Nick on May 23, 2014
60. ## chem

The minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164kJ/mol. Calculate the longest wavelenght visible to the human eye

asked by natash on October 27, 2008
61. ## Math

A certain medicine requires 10 mg per 40 kg of weight. How much medicine is required for a patient that weighs 203 pounds? Round answer to the nearest 10th. Use Unit Abbreviations for Units

62. ## Math amortization payments

What amortization payment would be required every six months at 14% interest to pay off a loan that is \$35,000 with in four years. answer needs to be rounded to the nearest cent. please check my answer thanks :) \$5,861.37

asked by Anonymous on November 14, 2007
63. ## Pharmacology

Amoxicillin suspension 125mg/5ml give ¾ tsp PO bid Disp: 10 day supply 5. How much suspension is required to fill this prescription? 6. What is the amount of mg per dose?

asked by KI on July 14, 2014
64. ## physics

A person pushes a 14.5 kg lawnmower at constant speed with a force of 88 N directed along the handle, which is at an angle of 45o to the horizontal. What is the force required to accelerate it from rest to 1.5 m/s in 2.5 seconds?

asked by Steve on October 11, 2008
65. ## Maths

A closed rectangular wooden box has external dimensions 17x12x10. If the wood is 1cm thick, calculate the volume of wood required to make it. (All measurements are in Cm)

asked by Jiskhaa on January 15, 2012
66. ## Physics

This is a pretty simple physics problem, but I do not know how to go about it. How do I: Show that the time required for a projectile to reach its highest point is equal to the time for it to return to its original height?

asked by Jeremy on January 24, 2010
67. ## Information Technology Principles

If a term paper consisted 42 pages, each containing 40 lines of 100 symbols each (counting each space as a symbol), was to be encoded using Unicode, how many bytes of storage space would be required?

asked by saqer on April 6, 2011
68. ## phyics/moon

The acceleration due to gravity on the Moon's surface is one-sixth that on Earth. What net force would be required to accelerate a 20-kg object at 6.5 m/s2 horizontally on the moon? A) 1.3 N B) 20 N C) 33 N D) 120 N E) 130 N

asked by sam on June 14, 2010
69. ## 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

asked by Peter on October 17, 2012
70. ## chemistry - titration question

please help me with this question! a 1g sample of naoh contaminated with na2co3 is titrated with 0.500MHCl, and it is found that 46.5mL of HCl are required for neutralization. Find the percentage by mass Na2Co3

asked by alex on April 21, 2008
71. ## Chemistry

hey guys can you please help me with this question. Identify the steps required to standardize a 0.1M HCl stock solution with sodium carbonate: Na2CO3, mol wt. = 105.99 g/mol. thank you

asked by Josephine on August 22, 2007
72. ## Chemistry

Oxygen gas reacts with powdered aluminum according to the following reaction: 4Al(s)+3 O2(g) --> 2 Al2O3 (s) How many liters of O2 gas, measured at 789 mm Hg and 35 C, are required to completely react with 2.2 mol of Al?

asked by Eileen on April 16, 2010
73. ## history

When a government lifted price controls after the war, prices a. remained about the same b. rose faster than wages c. fell to prewar levels d. required government support B?

asked by y912f on May 26, 2009
74. ## Georgia State History

Officials whose jobs are not provided for in the constitution but are required by law are known as__. A. constitutional officers B. secretaries of state C. deputies ** D statutory officials please check my answer :)

75. ## computers

If a term paper consisted 42 pages,each containing 40 lines of 100 symbols each (counting each space as symbol)was to be encoded using unicode, how many bytes of storage space would be required?

asked by Ryan on October 25, 2009

What is the angular momentum of a 2.5 kg uniform cylindrical grinding wheel of radius 19 cm when rotating at 1200 rpm? And how much torque is required to stop it in 5.7 s? Need help with step-by-step explanation.

asked by Anonymous on March 25, 2010
77. ## Chemistry

Calculate the molarity of 25.00ml H2SO4 solution if 32.48ml of 0.1068M NaOH is required to titrate? Balanced equation is H2SO4(aq)+2NaOH(aq)=Na2SO4(aq)+2 H2O (l)

asked by Jake on October 22, 2014
78. ## math

A certain medicine requires 10 mg per 10 kg of weight. How much medicine is required for a patient that weighs 273 pounds? Round answer to the nearest 10th. Use Unit Abbreviations for Units.

asked by chas on February 9, 2017
79. ## ap chemistry

What amount of energy is required to com- pletely ionize 26.9 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

asked by cheri on April 15, 2013
80. ## physics

A tapering wooden telegraph pole is 15ft long and its center of gravity is 6ft from one end. It weighs 400lbs. What force is required to lift each end?

asked by bird on January 18, 2011
81. ## History

Fill in the blanks. Under the Mississippi compromise, any new states formed west of the Mississippi river and north of the Missouri's southern border line were required to be __________.

asked by Emma on January 26, 2013
82. ## college statistics

assume the population of heights of female college students mean of 64.37 inches standard deviation of 6,26 in and random sample of 74 find p(x>65.25)B. find p(x>65.25)c. why is formulas required to solve a different than c.

asked by melba on June 14, 2012
83. ## Chem

Suppose that you start with 1000000 atoms of a particular radioactive isotope. how many half-lives woruld be required to reduce the number of undecayed atoms to fewer than 1000?

asked by Shay on October 20, 2014
84. ## Physics (just checking it)

q:The electricity revised at an electric substation has a potential difference of 2.80 10^5V, if the required output is 440 V. what should be the ratio of the turns of the step-down transformer? a: 28000/440= 636

85. ## physics

Agalvanometer of resistance 25 ohmes shows full scale deflection for current​ of 10mA, to convert it into 100 V range voltmeter , the required series resistance is

86. ## chemistry

Lakes that have been acidified by acid rain can be neutralized by liming, the addition of limestone (CaCO3). How much limestone in kilograms is required to completely neutralize a 5.8×109 L lake with a pH of 5.6? thanks

asked by amy on December 4, 2010
87. ## physics

An 85 kg football player traveling 4.7 m/s is stopped in 1.0 s by a tackler. What is the original kinetic energy of the player? (I tried using 1/2 m v^2 but that doesn't seem to be right. How do I manipulate the formula?) What average power is required to

asked by brooke on June 18, 2012
88. ## maths

Find the periodic payment R required to amortize a loan of P dollars over t years with interest earned at the rate of r %/year compounded m times a year. P=30,000 r = 8 t = 12 m =1

asked by luvena on December 21, 2014
89. ## physics

Calculate the magnitude of the force FM required of the "deltoid" muscle to hold up the outstretched arm shown in the figure below. The total mass of the arm is 2.8 kg and θ = 11°. d=12cm D=24cm

asked by Rpbert on October 29, 2016
90. ## physics

the floor of a lorry is 3m high, a plank 5m long is used as an inclined plan to raise some leading the maximum effort required to raise 200N load up the plane

asked by mike on June 13, 2017
91. ## DIFFERENTIATION

An open topped taking tin with a volume of 864 cm is to be constructed with a square base and vertical sides. Find the least amount of tin plate required.

asked by Anonymous on May 26, 2015
92. ## Chemistry

The problem on my homework is: What mass in grams of iron metal is required to react with 2.50 L of .1500 M of sulfuric acid to produce 18.35g of iron (III) sulfate? please help!

asked by Lauren on May 23, 2010
93. ## Chemistry

I need to make a calorimeter for my high school chemistry class. Any suggestions? I have a few ideas but I can't figure out how I would light the food on fire from inside the container. I have to burn the food and measure the heat through water. thank

asked by Elizabeth on February 11, 2014
94. ## Chemistry - Thermodynamics

A piece of metal of mass 12 g at 104◦C is placed in a calorimeter containing 45.4 g of water at 22◦C. The ﬁnal temperature of the mixture is 71.5 ◦C. What is the speciﬁc heat capacity of the metal? Assume that there is no energy lost to the

asked by Anonymous on January 22, 2014
95. ## Chemistry

Suppose you want to heat a mug of water (250mL) from room temperature at 25oC to 100oC to make a cup of tea. How much energy (in units of calories and joules) would you need from your microwave? Please make chart!!

asked by lop on March 23, 2012
96. ## chemistry

At constant pressure and 25 degrees C, what is delta H for the reaction 2C2H6(g) + 7O2(g) --yields-- 4CO2(g) + H2O(l) if the complete consumption of 11.3 g of C2H6 releases -586.3 kJ of heat energy? (11.3=.38 mol C2H6)

asked by marcus on November 14, 2012
97. ## Chemistry

On top of one of the peaks in Rocky Mountain National Park the pressure of the atmosphere is 500. torr. Determine the boiling point of water at this location. The heat of vaporization of water is 40.7 kj/mol.

asked by San on July 20, 2011
98. ## Physics

A lead bullet travelling at 350km/s strikes a target and is brought to rest.What will be the rise in the temperature of the bullet if there is no heat loss to the surrounding (SHC of Pb is 0.13J/k/kg and melting point of pb=600.5k)

asked by Blessing on January 17, 2013
99. ## Science

is heat added or removed in the following 1)grapes turn into raisins 2)frost forms ona cars windshield at night 3)moistuure forms ont he outside of a glass filled with a cold drink

asked by Cyleste on October 11, 2007
100. ## Chemistry

If 4.02g of hydrogen and 25.0g of oxygen (at standard conditions) are reacted to form water vapor, what quantity of heat is evolved from this reaction given that standard enthalpy of formation of H2O is -242kJ/mol?

asked by Kay on October 17, 2012