# How much energy (in kilojoules) is released when 12.3g of steam at 121.5degree C is condensed to give liquid water at 64.5 degree C? The heat of vaporization of liquid water is 40.67 kj/mol, and the molar heat capacity is

21,218 results
1. ## Chemistry

How much heat in kilojoules is required to warm 10.0 g of ice, initially at -10.0 ∘C, to steam at 115 ∘C. The heat capacity of ice is 2.09 J/g∘C and that of steam is 1.84 J/g∘C.

2. ## chemistry

Consider the reaction, C2H4 (g) + H2 (g)- C2H6 (g) where -137kJ of heat is released. How many kilojoules are released when 55.3g of C2H4 reacts?

3. ## Chemistry

Calculate the amount of energy in kilojoules needed to change 225 g of water ice at -10 C to steam at 125 C. The following constants may be useful: Cm(ice)=36.57 J/(mol*C) Cm(water)=75.40 J/(mol*C) Cm(steam)=36.04 J/(mol*C) Delta H(fus)=+6.01 kJ/mol Delta

4. ## chemistry

How much heat in kilojoules is evolved in converting 1.00 mol of steam at 145 Celsius to ice at -50 Celsius? Please, all particular steps and conversions between mole and grams of steam, H2O and ice. Thanks!

5. ## Chemistry

How much energy, in kilojoules per mole, is released when an electron makes a transition from n=5 to n=2 in an hydrogen atom? Is this energy sufficient to break the H-H bond (436 kj/mol is needed to break this bond)

6. ## chemistry

When hydrogen peroxide (H2O2) is used in rocket fuels, it produces water, oxygen, and heat. 2H2O2(l)⟶2H2O(l)+O2(g)ΔH=−196kJ How many kilojoules are released when 2.65 moles of H2O2 reacts? How many kilojoules are released when 234 g of O2 is produced?

7. ## Chemistry

How much heat (in kilojoules) is required to warm 11.0 g of ice, initially at -14.0 ∘C, to steam at 112 ∘C? The heat capacity of ice is 2.09 Jg−1∘C−1 and that of steam is 2.01 Jg−1∘C−1.

8. ## Astronomy

A roughly spherical asteroid with a diameter of 1 km, and a mean density of 4 g/cm^3, hits the Earth with a relative speed 1.5 times the orbital velocity of the Earth. Compute the amount of energy released upon the impact. Compare that with the energy

9. ## Chemistry, Math

A 115-g sample of steam at 100 °C is emitted from a volcano. It condenses, cools, and falls as snow at 0.0 °C. How many kilojoules were released? Can some explain how to do these kind of questions?

10. ## chemistry

Given that the specific heat capacities of ice and steam are 2.06 J/g°C and 2.03 J/g°C, the molar heats of fusion and vaporization for water are 6.02 kJ/mol and 40.6 kJ/mol, respectively, and the specific heat capacity of water is 4.18 J/g°C, calculate

11. ## Chemistry

Calculate the heat in kilojoules needed to condense 185g of steam at 100 ∘C.

12. ## Science (Chemistry)

"Calculate the amount of heat (kcal) released when 18.0 g (grams) of steam are condensed at 100.0 C and the resulting water is frozen and cooled to 25.0 C." The only problem that I'm having is the amount of physical and temperature changes that there are.

13. ## Physics

A steam engine's boiler completely converts 155 kg of water to steam. This process involves the transfer of 3.5 x 10^8 J by heat. If steam escaping a safety valve does 1.76 x 10^8 J of work against the outside atmosphere, what is the net internal energy of

14. ## chemistry

when 15.0g of steam drops in temperature from 275.0 celsius to 250.0 celsius, how much heat energy is released?

15. ## Chemistry

How many grams of ice could be melted by the energy obtained as 18.0 grams of steam is condensed at 100.0 degrees celcius and cooled to 0.0 degrees celcius?

16. ## chemistry 101

how much energy is released when 10 g of steam at 100 degrees celsius is condensed and cooled to body temperature?

17. ## Chemistry

Steam at 100°C was passed into a flask containing 250 g of water at 21°C, where the steam condensed. How many grams of steam must have condensed if the temperature of the water in the flask was raised to 76°C? The heat of vaporization of water at 100°C

18. ## College Chemistry

when a 0.702g sample of a mixture of volatile hydrocarbons is burned in a bomb calorimeter with a heat capacity of 4287 J/C, the temperature rises by 4.72 degrees C. How much energy (in kilojoules) is released during combustion?

19. ## Chemistry

How many grams of ice would be melted by the energy obtained as 16.2 of steam is condensed at 100 degrees celsius and cooled to 0 degrees celsius? I would like to know how it's done step by step.

20. ## chemistry

How much energy (in kilojoules) is released when 12.3g of steam at 121.5degree C is condensed to give liquid water at 64.5 degree C? The heat of vaporization of liquid water is 40.67 kj/mol, and the molar heat capacity is 75.3 J/(K mol) for the liquid and

21. ## Physics

What is the change in entropy of steam 320g of steam at 100°C when it is condensed to water at 100°C?

22. ## physics

200g of steam at 110°C is condensed, and the resulting water is frozen into ice at 0°C. How much heat was removed?

23. ## chemistry

kilojoules released when 80.0g of steam condenses at 100 ∘C and to cool the liquid and freeze it at 0 ∘C I used the formula for condensation/ evaporation( 80.0g(2260)1kJ/1000J=632.8) and then i used the formula for heat of

24. ## physics

A metal can containing condensed mushroom soup has a mass of 269 g, a height of 14.7 cm, and a diameter of 6.79 cm. It is placed at rest on its side at the top of a 3.34 m long incline that is at an angle of 22.4o to the horizontal and is then released to

25. ## Chemistry

How much energy (in kilojoules) is released when 12.8 g of steam at 130.0 C is condensed to give liquid water at 73.5 C? The heat of vaporization of liquid water is 40.67 kJ/mol, and the molar heat capacity is 75.3 J/(K*Mol)for the liquid and 33.6

26. ## Physics

How much energy is released when 1 gram of steam condenses to water at 100 degrees Celsius?

27. ## Physics

How do i determine the mass of ice initially in the calorimeter when dry saturated steam is passed into 250g of a mixture of ice and water in a calorimeter of thermal capacity 45J/K when all the ice has just melted,and the mass of the content in the

28. ## chemistry

When 15.0 g of steam drops in temperature from 275.0 degrees c to 250.0 degrees, how much heat energy is released

29. ## Chemistry

How much heat (in kilojoules) is released on reaction of 5.30 g of Al?

30. ## physics

Dry saturated steam at 100 degree C is passed into 250 gm of a mixture of ice and water contained in a calorimeter of thermal capacity 45J/K.When all the ice has just melted,the mass of the content has increased by 10 gm due to condensed steam.Assuming no

31. ## Chemistry

one mole of ethanol releases 326.7 calories of energy during combustion. how many calories kilojoules are released? thank you ! :)

32. ## physics

Pls help pls help me solve. Dry steam at 100 degree Celsius is bubbled into 500 g of water originally at 20 degree Celsius. What will be the temperature of the water after 30 g of steam has condensed? ( specific heat capacity of water =4200,specific latent

33. ## physics

A quantity of steam (750 g) at 122°C is condensed, and the resulting water is frozen into ice at 0°C. How much heat was removed?

34. ## chemistry

How much energy (in kilojoules) is released when 12.3g of steam at 121.5 degree C is condensed to give liquid water at 64.5 degree C? The heat of vaporization of liquid water is 40.67kj/mol , and the molar heat capacity is 75.3 J/(K mol) for the liquid and

35. ## Chem URGENT

How much energy (in kilojoules) is released when 13.3g of steam at 114.5∘C is condensed to give liquid water at 67.0∘C? The heat of vaporization of liquid water is 40.67 kJ/mol, and the molar heat capacity is 75.3 J/(K⋅mol) for the liquid and 33.6

36. ## Physics

Dry saturated steam at 100'C is passed into 250gm of a mixture of ice and water contained in a calorimeter of thermal capacity 45J/K.When all the ice has just melted,the mass of the content of the calorimeter has increased by 10gm due to condensed

37. ## Physical Science

A 5.00 kg block of ice at –25 oC is converted to steam at 125 oC. How much energy (in kilojoules) is expended in this process? The following data are provided: a. Specific heat of ice = 2.092 J/g oC b. Latent heat of fusion = 334.72 J/g c. Specific heat

38. ## CHEMISTRY

Given that the specific heat capacities of ice and steam are 2.06 J/g°C and 2.03 J/g°C, the molar heats of fusion and vaporization for water are 6.02 kJ/mol and 40.6 kJ/mol, respectively, and the specific heat capacity of water is 4.18 J/g°C, calculate

39. ## Chemistry

How much energy would be released when 675 grams of steam is condensed to water

40. ## chem3a

How much heat in kilojoules is evolved in converting 2.00 mol of steam at 145 ∘C to ice at -35.0 ∘C? The heat capacity of steam is 1.84 J/g∘C and that of ice is 2.09 J/g∘C.

41. ## chem

How many kilojoules of energy are released from the carbon carbon single bonds when glucose (C6H12O6) is burned??? i asked this before but i don't really understand it any better. can someone please explain it differently thanks

43. ## Physics

1. A steam engine converts 150 kg of water completely to steam. The process involves transfer of 4 x 10^8 J as heat. If steam escaping through the safety valve does 2 x 10^8 J of work against outside atmosphere, the net change in the internal energy is: a.

44. ## science

A quantity of steam (200 g) at 126°C is condensed, and the resulting water is frozen into ice at 0°C. How much heat was removed?

45. ## general chemistry

How much heat in kilojoules is evolved in converting 1.50moles of steam at 150 degrees celcius to ice at -60.0 degrees celcius? The heat capacity of steam is 1.84J/g degree C and that of ice is 2.09J/g degree C.

46. ## chemistry

How much energy (in kJ) is released when 16.4 g of steam at 121.5 degrees C is condensed to give liquid water at 60.5 degrees C? The heat of vaporization of liquid water is 40.67 kJ/mol and the molar heat capacity is 75.3 J/(K*mol) for the liquid and 33.6

47. ## Chemistry, Math, Science

A 115-g sample of steam at 100 °C is emitted from a volcano. It condenses, cools, and falls as snow at 0.0 °C. How many kilojoules were released? Can someone please teach me how to do this? I've seen other posts, but I don't understand that Q1, Q2, Q3

48. ## Chemistry (Internal Energy)

5 kg of steam contained within a piston-cylinder assembly undergoes an expansion from state 1, where the specific internal energy U(1) is = 2710 [kJ/kg] to state 2, where U(2) = 2660 [kJ/kg]. During the process, there is heat transfer to the steam with a

49. ## Chemistry

How many kilojoules are required to change 85g of water at 25 C to steam at 100 C?

50. ## chemistry

What is the energy released when steam at 25 g of steam at 10 degree celcius is cooled to ice at-10 degree celcius work heat change for the following changes calculated 150 degree Celsius steam --150 degree water 150 degree water to 0 degree water 100

51. ## Chemistry

Calculate the heat in kilojoules needed to condense 185g of steam at 100 ∘C.

52. ## Chemistry

How many kilojoules are released when 85.0g methanol is burned?

53. ## Chemistry

How much energy (in kilojoules) is released when 15.2g of steam at 114.5∘C is condensed to give liquid water at 63.5∘C? The heat of vaporization of liquid water is 40.67 kJ/mol, and the molar heat capacity is 75.3 J/(K⋅mol) for the liquid and 33.6

54. ## Chemisty

In an experiment, 230 kJ of heat energy are released to the surroundings when steam is converted to liquid water. Calculate the number of grams of water condensed. The following data may be of use: vap = 2260 J/g; Hfus = 334 J/g; Cp(ice) = 2.06

55. ## Chemistry

Energy is released when 100kg of steam at 150.0°C and standard pressure changes to water at 60.0°C. Calculate the total energy change. Energy change= heat to cool steam to 100C + heat to change steam to water + heat change for water from 100 to 60c

56. ## Chemistry

Calculate the amount of heat in kilojoules released when 50 grams of steam at 125 C are convert to 50 grams of ice at 125 C please help

57. ## Chem...one more time

Ok ok I swear after this I'm done asking questions. It's just that I'm trying so hard to understand all of this, but sometimes it just doesn't make sense to me! So here we go: How many J of energy must be removed when 124.0 g of steam, at a temp. of 167.0

58. ## Chemistry

Please help i don't get the answer. How much energy, in kilojoules per mole, is released when an electron makes a transition from n=5 to n=2 in an hydrogen atom?

59. ## CHEMISTRY HELP !!!! Show work please!

Compute the energy released in kilojoules when the sun converts 1.00 metric ton into energy. NOTE: 1 metric ton = 1000 kg.

60. ## Physics

When a cubic meter of steam at 100°C condenses, how much energy is released?

61. ## chem

How many kilojoules of energy are released from the carbon carbon single bonds when Glucose (C6H12O6) is burned? how would i do this?

62. ## physics

Suppose 3.0 cm of rain at 10°C falls on a rectangular region of dimensions 2.0 km x 3.0 km. How much energy was released when water vapor condensed to form this amount of rain?

63. ## Chemistry

For the chemical reaction shown below, select the best answer. H2 + O2 + Br2 ----> HBrO A. some energy will be released and some energy will be absorbed with the reaction occurs, but more energy will be absorbed than will be released B. some energy will be

64. ## physics

A steam engine’s boiler completely converts 151 kg of water to steam. This process in- volves the transfer of 4.8786 J J as heat. If steam escaping through a safety valve does 1.66 × 108 J of work expanding against the outside atmosphere, what is the

65. ## Chemistry

Given that the specific heat capacities of ice and steam are 2.06 J/g degrees C and 2.03 J/g degrees C, respectively, calculate the total quantity of heat evolved when 10.0 g of steam at 200 degrees C is condensed, cooled, and frozen to ice at -50 degrees

66. ## science

A quantity of steam (750 g) at 122°C is condensed, and the resulting water is frozen into ice at 0°C. How much heat was removed?

67. ## Physics

1. A steam engine converts 150 kg of water completely to steam. The process involves transfer of 4 x 10^8 J as heat. If steam escaping through the safety valve does 2 x 10^8 J of work against outside atmosphere, the net change in the internal energy is: a.

68. ## 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

69. ## physics

A metal can containing condensed mushroom soup has a mass of 269 g, a height of 14.7 cm, and a diameter of 6.79 cm. It is placed at rest on its side at the top of a 3.34 m long incline that is at an angle of 22.4 degrees to the horizontal and is then

70. ## CHEM

How many kilojoules are released when 85.0g methanol is burned?

71. ## thermo

Saturated water vapor at 100 kPa jets into a pitcher containing 0.17 Kg of water initially at 278 K. If steam ow rate is 4 gm/min, estimate how long it takes to heat the water to 322 K. Assume the process is at constant pressure (at 100 kPa) and kinetic

72. ## chemistry

How much energy (in kilojoules) is released when 12.3 of steam at 121.5 is condensed to give liquid water at 64.5? The heat of vaporization of liquid water is 40.67 , and the molar heat capacity is 75.3 for the liquid and 33.6 for the vapor.

73. ## chemistry

How much energy (in kilojoules) is released when 12.3g of steam at 121.5 degree C is condensed to give liquid water at 64.5 degree C? The heat of vaporization of liquid water is 40.67kj/mol , and the molar heat capacity is 75.3 J/(K mol) for the liquid and

74. ## Physics

How do i determine the rise in temperature when the passage of steam is continued until a further 15g of steam has condensed and the mixture is in thermal equilibrium when dry saturated steam at 100 degrees C is passed into 25g of a mixture of ice and

75. ## Science

3000 kg of exhaust steam is condensed/h in a surface condenser. The dryness fraction of the steam entering the is 0.85.the barometer reads 760mm Hg and the vacuum gauge reading os 680 mm Hg. if the rise in temperature of the cooling water is 12°C ,

76. ## Chemistry

A flask was immersed in 350 g of water at 25 degrees C. Steam at 100 degrees C was passed into this flask, and eventually condensed into water at 100 degrees C. If the temperature of the water surrounding the flask was raised to 70 degrees C, how many

77. ## Physics

Suppose 2.7 centimeters of rain at 15 degrees Celsius falls on a rectangular field of dimensions 2.1 kilometers by 1.1 kilometers. The amount of energy released when water vapor condensed and cooled to form this rain is equivalent to how many

78. ## Chemistry

How many kilojoules of energy would be liberated by condensing 48.03 mol of steam initially at 110.0 °C and then allowing the liquid to cool to 32.9 °C?

79. ## Chemistry

How much energy is released when 54.0 g of H2O are condensed from a gas at 115°C to a liquid at 65°C?

80. ## chemistry

How much energy (in kilojoules) is released when 21.0 of ethanol vapor at 94.5 is cooled to -19.0?

81. ## Chemestry

Calculater the amount of heat in kilojoules released when 50 grams of steam at 125 C are converted to 50 grams of ice at -125 C?

82. ## Science (Chemistry)

"Calculate the amount of heat (kcal) released when 18.0 g (grams) of steam are condensed at 100.0 C and the resulting water is frozen and cooled to 25.0 C." The only problem that I'm having is the amount of physical and temperature changes that there are.

83. ## Physics - Heat and phase change

Consider a 14.3 g sample of steam initially at 100*C. How many kilojoules equal the amount of energy emitted by this sample as it condenses, cools to it's freezing point, and subsequently freezes to form ice at 0*C

84. ## Chemistry (Check)

The Lyman series. Of the four lines, 91.2nm, 97.2nm, 102.6 nm, and 121.6nm, which one has the A. Highest wavelength? _____ B. Highest energy? ______ C. Highest frequency?_(1)____ which equals__(2)____ My answers A. 91.2 B. 121.6 C. (1) 121.6 C. (2) energy

85. ## chemistry

given the following info for water specific heat capacity of steam 2.03 j/g degrees calculate the total quanity of heat evolved when 10.0g of steam is condensed,cooled,and frozen to ice at -50 degrees

86. ## chemistry

How many kilojoules of energy are released from the carbon carbon single bonds when glucose (C6H12O6) is burned??? thanks

87. ## science

How to determine the amount of energy released when 50g of 100C steam changes to 0C ice?

88. ## chemistry

is this the right anser? for this problem please let me know thanks calculate the amount of heat in kilojoules released when 50 grams of steam at 125 C are converted to 50 grams of ice at -125 C so 50 grams of H2O Ti= 124 C Tf= -125 C q=? J=? q=m *Cp * At

Hi, I just need to know if I finally got this exercise right. Calculate the amount of heat in kilojoules released when 50 grams of steam at 125 Celsius are converted to 50 grams of ice at -125 Celsius. so, qw= 50*4.184J/g C (125 C-o)= 26.15 x 10^3 qi=

90. ## Physics

A hot steam burn is worse than boiling water burn: (a) If 4 mL of 100°C hot steam condenses on your arm, how much energy is released as it condenses and cools to human body temperature of 37°C? (b) If 4 mL of 100°C hot water spills on your arm, how much

91. ## physics

if 8100 calories are released from 200g of steam at 100C, how much of the steam condenses?

92. ## Chemistry

is this right when a fuel is burned some of its chemical potential energy is lost as heat. and To convert kilojoules to joules dived the number of kilojoules by 1000 joules/1 kilojoule

93. ## Chemistry

How much energy (in kilojoules) is released when 26.5 of ethanol vapor at 86.0 is cooled to -12.0? Ethanol has = -114.5 , = 78.4 , = 38.56 and = 4.60 . The molar heat capacity is 113 for the liquid and 65.7 for the vapor

94. ## Engineering

Consider a diesel-fired steam power plant that produces 400 MW of electric power. The turbine inlet conditions of 5 MPa and 500°C and a condenser pressure of 25 kPa. The state of the water at the inlet of the pump is saturated liquid. The steam has

95. ## Physics

A quantity of steam (600 g) at 112°C is condensed, and the resulting water is frozen into ice at 0°C. How much heat was removed? ___kcal

96. ## Chemistry

"Energy is released when 100 kg of steam at 150 degrees Celsius and standard pressure changes to water at 60 degrees Celsius. Calculate the total energy change". I used q=mct to find the energy required to change to 100 degrees Celsius. But now what??

97. ## stat

Diana and franklin both play a card game called cribbage,in whichthe first person to earn 121 points is the winner. The table below shows the results of six games of cribbage. Dianna's score/Franklin's score Game 1 121/118 Game 2 121/101 Game 3 98/121 Game

98. ## Chemistry

calculate the amount of heat released, in joules, in converting 75.0 g of steam at 115 degrees of Celsius to steam at 110 degrees Celcius

99. ## science

the quantiti of heat released 10 gr of steam at 100 degrees Celcius[ latent heat of steam =540 cal g -1 ].

100. ## Chemistry

Determine the Energy and n(i) for the spectral line at 121.6 nm (orange). Given: spectral line: 121.6 nm n(f) = 1 Find Energy and n(i)