1. chemistry

    The value of ΔH° for the reaction below is - 6535 kJ. __________ kJ of heat are released in the combustion of 16.0 g of C6H6(l)? 2C6H6(l) + 15O2(g) → 12CO2(g) + 6H2O (l)

    asked by Anonymous on November 2, 2014
  2. Chemistry

    A certain substance has a heat of vaporization of 26.49 kJ/mol. At what Kelvin temperature will the vapor pressure be 5.00 times higher than it was at 285 K?

    asked by Nick Tanner on January 15, 2014
  3. Urgent Chem Help

    A certain substance has a heat of vaporization of 55.30 kJ/mol. At what Kelvin temperature will the vapor pressure be 3.50 times higher than it was at 361 K?

    asked by Carl on February 10, 2013
  4. chemistry

    How much H2 gas at STP can be produced by the reaction 2 Na(s) + 2 H2O(ℓ)heat−→ H2(g) + 2 NaOH(aq) of 3.90 g of Na and excess water? Answer in units of L.

    asked by Abby on February 25, 2015
  5. explian why please its physics

    expliain y the very high specific heat capacity of water leads to formation of land and sea breezes???

    asked by kimberly on December 7, 2008
  6. Physics

    (30)(Cm)Δ+(335.5)(4.18)Δ(21)=0 I need to find the specific heat of the masses, but i don't know how to, i'm currently doing a lab and these are the mass and temp. numbers that i plugged in...

    asked by Me and I on March 17, 2014
  7. CHEMISTRY> HELP QUICK! pls

    A system loses 14.2 kJ of heat while performing 7.2kJ of work on the surroundings. If the initial internal energy, E, is 77.6 kJ, what is the final value of E? 56.2 kJ 70.6 kJ 99.0 kJ 84.6 kJ

    asked by Lucinda on August 20, 2010
  8. Chemistry

    A certain substance has a heat of vaporation 56.21 kj/mol. At what kelvin temperature will the vapor pressure be 6.50 times higher than it was at 361k? Thank you

    asked by Josh on July 9, 2011
  9. Chemistry

    What is the change in internal energy (in J) of a system that absorbs 0.677 kJ of heat from its surroundings and has 0.438 kcal of work done on it?

    asked by Ashley on October 20, 2010
  10. Physics

    If 500 grams of a metal requires 70 calories of energy to raise its temperature by 10 Kelvin, what is its specific heat?

    asked by John on October 28, 2010
  11. physics

    How much heat is absorbed by a 30g iron skillet when its temperature rises from 24oC to 93oC? Joules do i addition everything?

    asked by jake on January 24, 2017
  12. chemistry

    When 34.1 g of lead reacts with 6.81 L of oxygen gas, measured at 1.00 atm and 25.0°C, 36.1 kJ of heat is released at constant pressure. What is DH° for this reaction?

    asked by george on October 5, 2014
  13. chemistry

    if heat was added at a constant rate to the solid subsance, why did the temperature remain at 16 degree C for approximately 6 minutes?

    asked by amanda on October 4, 2010
  14. Chemistry 2 ap

    How much heat energy is produced when 31.6 grams of propane are burned? I asked my teacher and she said it would be a stochiometry problem but im still confuded:/

    asked by Peanut on October 28, 2010
  15. Physics

    An electric filament can heat 200 cm^3 of water from 5°C to 95°C in 6 minutes. If the voltage source is a 12 V battery, how much current does it draw?

    asked by Jake on July 10, 2017
  16. Science!-meterology

    What are the effects of the transfer of heat into the inside of the hydroshphere and atmosphere on the development, intensity and circulation of meterological systmems?

    asked by Sara on January 17, 2007
  17. chemistry

    How long would it take for 1.50 moles of water at 100.0 to be converted completely into steam if heat were added at a constant rate of 19.0 j/s ?

    asked by Anonymous on October 11, 2008
  18. chemistry

    determine the specific heat of a 150.0 gram object that requires 62.0 cal of energy to raise its temperature 12.0 C.

    asked by ada on February 15, 2012
  19. Science please help

    i am sorry to bother you Ms. Sue but i need to present your proposal of a device that minimizes heat transfer. can you please give a list of insulators

    asked by banna on April 30, 2017
  20. physical science

    How much heat is absorbed by a 30g iron skillet when its temperature rises from 24oC to 93oC? Joules do i addition everything?

    asked by jake on January 24, 2017
  21. chem

    If you used the 8900 kilojoules you expend in energy in one day to heat 46000 {\rm g} of water at 25^\circ {\rm C}, what would be the rise in temperature?

    asked by Anonymous on September 14, 2011
  22. Chemistry

    What is final temperature of a 88 gram sample symbol of water at 295 k that absorbs 1250 Joules of heat ?

    asked by Kiki on November 14, 2016
  23. Chem

    H2SO4(aq) + Ba(NO3)2(aq) = BaSO4(s) + 2HNO3(aq) overall heat gen by reaction answer is supposed to be -659.3 but I keep coming up with something else.

    asked by Drew on December 14, 2010
  24. Chemistry

    Calculate the heat released when 454 g of steam at 100.0C condenses and then cools to 30.0C. State your answer in calories.

    asked by Ray on April 3, 2013
  25. chemistry

    How much heat (in kilocalories) is evolved or absorbed in the reaction of 1.60 g of Na with H2O? 2Na(s)+2H2O(l)→2NaOH(aq)+H2(g), ΔH = -88.0 kcal (-368 kJ)

    asked by Anonymous on October 24, 2016
  26. Chemistry

    A certain substance has a heat of vaporization of 34.65 kj/mol. At what kelvin temperature will the vapor pressure be 3.50 times higher than it was at 331 k?

    asked by Josh on January 25, 2012
  27. chemistry

    Determine how much heat (in kilojoules) is evolved or absorbed in the reaction of 1.05 g of Na with H2O: 2Na(s)+2H2O(l) →2NaOH(aq)+H2(g),ΔH∘=−368.4 kJ

    asked by Jay on February 11, 2016
  28. Physics

    A 0.2 kg glass cup at 20 C is filled with 0.4 kg of hot water at 70 C. Neglecting any heat losses to the environment, what is the equilibrium temperature?

    asked by Bob on May 23, 2012
  29. francais freshmen

    Translate into french please: Return to heat and cook until set and edge is dry,(takes approximately 30 seconds).

    asked by Gabrielle on February 20, 2011
  30. physics

    A police offer may warn that “speed kills.” In video games, high-speed crashes are common. Suppose a particular scene in a game required the following elements: • a high performance motorcycle must crash into a barrier and be stopped • a small

    asked by alejandro on April 5, 2013
  31. reading

    Some turtles live in the sea. Some turtles live in the land. Some turtles are pets and live in houses. The words below relate to different places where turtles live. Read the words. Then write the words in the groups where they belong. tank-beach-soil-heat

    asked by 3 grade on October 25, 2010
  32. Mathematics

    a cuboid with length 13cm width 4cm and height h State in terms of h the shaded face of the cuboid. write an expression in terms of h for the volume of the cuboid. if the volume of the cuboid is 286cm cube calculate the height h of the cuboid.

    asked by SAM on May 2, 2012
  33. mathFormula

    Formula for calculating cubic feet. length(in feet) x width(in feet) x height(in feet) = volume in cubic feet. Thank you DrBob That's for a cube or four sided regular figures. For a cylinder, it's pi*(radius2)*height and there are other formulas for other

    asked by Richard on August 20, 2007
  34. chemistry

    Calculate the current required to transfer 0.015 mols of electrons in a time of 20 min

    asked by Priya on April 22, 2008
  35. physics

    what potential difference delta V is required to accelerate protons from the rest to 10% of the speed of light?

    asked by ike on April 13, 2011
  36. chemistry

    what mass of potassium chloride is required to prepare 5.00L of a 2.00M solution of KCL

    asked by TROUBLED on October 24, 2011
  37. Chemistry 104 PLEASE HELP ME!!

    Determine the weight of Na2C2O4 which is required to react completely with 20.0ml of 0.02M KMnO4.

    asked by Sophie on May 5, 2013
  38. chemistry

    You need to make a solution containing 150 g of potassium chloride in 300 g of water. What temperature is required?

    asked by Anonymous on April 19, 2012
  39. Chemistry 20

    What volume of concentrated phosphoric acid is required to prepare 250ml of a 0.375mol/L solutions?

    asked by Cheryl on June 18, 2011
  40. Physics

    Calculate the work required to be done to stop a car of 1500kg moving with a velocity of 60km/hr?

    asked by Abhishek on April 8, 2013
  41. chemistry

    how many liters of 0.100 M HCL would be required to react completely with 5.00 grams of calcium hydroxide?

    asked by mac on March 6, 2008
  42. chem

    What volume of 0.0658 M calcium hydroxide is required to neutralize 45.10 mL of 0.0242 M nitric acid?

    asked by Anonymous on January 19, 2015
  43. physics

    two electric charges +10 microC and -20microC are located .35 m apart how much work is required to double the distance between them?

    asked by Grane on November 4, 2012
  44. Physics

    What push parallel to a 42 incline is required to just start a 340 N block sliding up the plane? us = 0.6

    asked by MA on November 2, 2012
  45. Chemistry help

    How many moles of Fe3O4 are required to supply enough iron to prepare 0.752 mol Fe2O3?

    asked by Tina on September 20, 2015
  46. Chemistry

    What mass of Pb(NO3)2,would be required to yeild 9g of PbCl2,on d addition of excex NaCl?Pb=207,N=14,O=16,Na=23,Cl=35.5

    asked by Cally on April 10, 2019
  47. Chemistry

    If 30.3 liters of O2 at 273K and 1 atm are produced by the electrolysis of water, how many coulombs of charge were required?

    asked by Dana on November 19, 2010
  48. Math

    A 21% oil gas mixture is to be formed by mixing 80% and 20% oil_gas mixtures. If 35L are required l, how much of each should be used?

    asked by Abdul on February 11, 2019
  49. Chemistry

    If 30.3 liters of O2 at 273K and 1 atm are produced by the electrolysis of water, how many coulombs of charge were required?

    asked by Dana on November 19, 2010
  50. Physics

    What net external force is required to give a 35.7 kg suitcase an acceleration of 2.8 m/s2 to the right? Answer in units of N.

    asked by Brett on September 19, 2011
  51. Chemistry

    What volume of 0.5 N nitric acid would be required to completely neutralize 300 ml of 1.0 N sodium hydroxide?

    asked by Jeff on October 6, 2010
  52. chemistry

    calculate the weight of oxalic acid required to neutralise 250 mL , 0.1 N KOH sollution?

    asked by Anonymous on September 8, 2013
  53. Economics/Money

    Suppose that banks today were required to keep 100 per cent reserves against their deposits. What would be the result?

    asked by Labz on April 21, 2012
  54. chem

    What mass of NaCl is required to precipitate all the silver ions from 19.2 mL of 0.100 M AgNO3 solution?

    asked by Sara on March 19, 2011
  55. Physics

    What net external force is required to give a 30 kg suitcase an acceleration of 2.5 m/s2 to the right? Answer in units of N

    asked by Sam on September 18, 2013
  56. Chem

    What pressure is required to reduce 70 mL of a gas at standard conditions to 16 mL at a temperature of 22◦C? Answer in atm.

    asked by Thomas on May 7, 2019
  57. Biochemistry

    Calculate [H+] or [OH-]as required for each of the following solutions at 25degrees and state whether the solution is neutral, acidic or basic

    asked by Mervis on June 10, 2017
  58. math

    How much time required to fill the 1000litre water tank with 2 inch pipe How it calculate

    asked by vimalraj on March 19, 2017
  59. chemistry

    how ,amy grams of aspirin are required to react exactly with 29.40ml of a 0.6M solution of sodium hydroxide

    asked by ujay on January 17, 2010
  60. chemistry

    What volume of 1.00 M NaOH would be required to neutralize 77.4 mL of 5.4 M HCl? Round to two places after the decimal point and keep it in mL

    asked by Corso on February 20, 2014
  61. chemistry

    what weight of na2c03 of 95% purity would be required to neutralize 45.6ml of 0.235N acid? Who Helps

    asked by Fai on January 27, 2013
  62. chemistry

    calculate the energy required to raise the temp of 72g of water from 50c tp 150

    asked by dd on December 11, 2014
  63. chemistry

    what mass of potassium hydroxide is required to produce 2.00L of a solution mthat has a pOH of 4.5?

    asked by judi on May 8, 2010
  64. CHM 152

    How many gram of Fe+3 are required to make 1.0 L of an aqueous solution of 10 ppm Fe+3? Assume density of water is 1.00 g/mL.

    asked by Car on June 8, 2010
  65. chemistry

    Calculate the energy required for the ionization of an electron from the ground state of the hydrogen atom.

    asked by masre man on November 26, 2018
  66. AE

    steps required for a multicultural education to be effective. would that be treating each student eaqually and fairly?

    asked by scooby91320002 on March 15, 2009
  67. geometry

    How much foil is required to cover a rectangular box that is 4in. by 8in. by 5in.? use 3.14 as an aproximation for pi. where appropriate.

    asked by DJ on July 17, 2010
  68. physics

    the force required to maintain an object at a constant velocity in free space is eaqual to?

    asked by john on February 20, 2013
  69. math

    Find the derivative algebraically. g(t) = t^2 + t at t = −1 I can't seem to start this problem correctly. What is the process required for this question?

    asked by Natalie on September 16, 2015
  70. general chemistry 2

    How many grams of urea [CO(NH2)2] would be required to prepare 200 mL of a 5.0 x 10-3 molar solution? Answer

    asked by Anonymous on September 26, 2012
  71. Chemistry

    What volume in liters will be required to dissolve 60.9 grams of Mg(OH)2? Ksp = 1.8×10-11 After doing the math, i got 1.58e-4, but its not right, so i have no idea what to do now.

    asked by Brianna on March 25, 2014
  72. Algebra

    Show that two WRONG's can make a RIGHT. Replace each different letter in the addition problem with a different digit. It is required that O=zero.

    asked by Rachel on November 21, 2010
  73. chemistry

    What amount of current, in amperes, would be required to deposit 19.7 g of Au metal in 1.00 hour from a solution of Au(NO3)3?

    asked by zak on May 2, 2014
  74. Chemistry

    How many grams of sodium sulphate (mol. wt. 142) are required to make 1.2 liters of 0.5N solution

    asked by Frank on September 19, 2013
  75. physics

    A capacitor has a capacitance of 3 pF. What potential difference would be required to store a charge of 21 pC? Choose one answer. a. 3 V b. 21 V c. 7 V d. 0.14 V

    asked by ashley --- HELP PLEASEE!!! on May 14, 2011
  76. College Physics

    how much work is required to completely separate two charges (each -1.4 microcoulombs) and leave them at rest if they were initially 8 mm apart?

    asked by CourtneyW on February 3, 2011
  77. Adobe Photoshop

    List the steps required to be able to view each font to the selected type? I cant find the answers for that.

    asked by sami on September 24, 2017
  78. chemistry

    Calculate the energy required for ionization of electron from the ground state of hydrogen atom

    asked by donald on January 9, 2017
  79. math

    what is the total amount of edging that would be required to cover all edges of a rectangular prism measuring 10 cm by 30 cm by 15 cm?

    asked by sharon on May 7, 2015
  80. chemistry

    What volume of ammonia gas at STP is required to neutralise 40cm of 2m sulphuric acid

    asked by Anonymous on April 28, 2018
  81. chemistry

    How many moles of Fe3O4 are required to supply enough iron to prepare 0.785 mol Fe2O3?

    asked by Anonymous on September 22, 2012
  82. Chemistry

    What volume of Cl2 gas, measured at 687torr and 34∘C, is required to form 27g of NaCl?

    asked by Amy on April 6, 2014
  83. chemistry

    The mass of FeSO4.7H2O required to prepare 500mL of 280ppm Fe2+solutin is

    asked by selvi on April 21, 2010
  84. Health Information Management

    At what point during the course of treatment of a new patient should notice of use and disclosure of health information, required under HIPAA, be given?

    asked by Ella on May 21, 2009
  85. chem 130

    what mass of sodium hydroxide will be required to neutralize completely 1.60x10^23 molecules of HCl?

    asked by Heather on November 17, 2015
  86. physics

    Calculate the net force required to give a 3000 kg truck an acceleration of 2.5m per squared

    asked by Natasha on October 15, 2018
  87. health information

    At what point during the course of treatment of a new patient should notice of use and disclosure of health information, required under HIPPA, be given and why?

    asked by Sindi on August 2, 2008
  88. Chemistry

    How many milligrams of NaHCO3 are in a 500mg tablet if 40.0 mL of 0.120M HCL is required to neutralize the sample?

    asked by prince on December 9, 2010
  89. Math

    How would you do this problem. What is the growth rate of the stock with a $3.00 expected dividend and a $20.60 price with 15%required return?

    asked by Robin on June 21, 2013
  90. Maths, physics, chemistry,

    The weight of H2C2O4.2H2O required to prepare 500 ml of 0.2N solution is a)126g b)12.6g c)63g d)6.3g

    asked by Deepak on April 29, 2017
  91. health

    Dietary guidelines are _________________ for Americans to follow. A recommendations B required C reinforced D repeated

    asked by moshimonsterssssss on October 12, 2018
  92. Physics

    What is the work required for a 1000kg truck to increase in speed from 30 m/s to 40m/s? Is the answer 350 kJ?

    asked by Harold on March 4, 2009
  93. algebra

    (a) A graph of is shown in the figure, where y _ L(x). As the weight of the plane increases, what can be said about the length of the runway required?

    asked by logan on June 1, 2011
  94. Math

    It is required to sit 4 males and 5 females in arrow so that the male occupy the even place. How many such arrangements are possible?

    asked by Honey on October 7, 2015
  95. chemistry

    What mass of NaOH is required to precipitate all the Fe2+ ions from 50.0 mL of 0.200 M Fe(NO3)2 solution?

    asked by jennifer on January 11, 2010
  96. Chemistry

    How many mL of 0.024M KMn04 (Potassium Permanganate) is required to react with 20mL of 0.112M Fe2+?

    asked by Joe on May 29, 2011
  97. chemistry

    The time required for the completion of 99.9% of a first order reaction is equal to how many times that of its half life? (A)2 (B)3 (C)5 (D)10

    asked by Poonam on March 12, 2012
  98. Biochemistry

    Calculate the mass (in g) of solid potassium hydroxide required to prepare: a) 1.75 litres of a solution with pH 11.5

    asked by Sarah on August 3, 2016
  99. Chemistry

    How many moles of Fe3O4 are required to supply enough iron to prepare 0.442 mol Fe2O3?

    asked by Muhammad on September 22, 2012
  100. algebra Word problem

    what interest rate is required for an investment subject to continuous compounding to triple in 15 years? A= Pe^rt ?

    asked by Kira on April 11, 2014