# Calculate the pH of the solute in an aqueous solution of 0.0047 M codeine, if the pKa of itsconjugate acid is 8.21. What is the percentage protonation of the solute?

46,915 questions, page 337
1. ## Introductory Chemistry

In a titration 25.1ml of a monoprotic weak acid is neutralized with 25.1 ml of .502M NaOH(aq). Calculate the Ratio of [A-] to [HA] after 12.55 of the .502 M NaOH has been added to the initial amount of HA. Anyone have any idea what's going on. I got as far

asked by Nina on February 4, 2009
2. ## chemistry

Calculate the energy that must be removed to convert substance X from a gas at 115°C to a solid -50.7°C. Assume X has a molar mass of 75.0 g/mol. Specific heat capacities ΔHvap 20. kJ/mol C(s) 3.0 J/g · °C ΔHfus 5.0 kJ/mol C(l) 2.5 J/g · °C bp

asked by Trish on April 19, 2010
3. ## College Physics

Calculate the rotational inertia of a meter stick, with mass 0.58 kg, about an axis perpendicular to the stick and located at the 43 cm mark. (Treat the stick as a thin rod.) I know I = (1/12)(M)(L^2) and then I need to use the parallel-axis theorem so I

asked by Ryan on December 1, 2009
4. ## physics

A driver in a car traveling at a speed of 59 mi/h sees a deer 104 m away on the road. Calculate the minimum constant acceler- ation that is necessary for the car to stop without hitting the deer (assuming that the deer does not move in the meantime).

asked by Dalton on August 11, 2010
5. ## Chemistry 30

A mass of 45.0g of molten silver at its melting point is poured into 750mL of calorimeter water at 25.0C. The final temperature reached by both is 30.0C. If the specific heat capacity of silver is 0.235 kJ/kgC, calculate the molar heat of solidification of

asked by Amber on March 8, 2015
6. ## Physics

Two astronauts, each having a mass of 61.9 kg, are connected by a 14.7 m rope of negligible mass. They are isolated in space, orbiting their center of mass at speeds of 5.57 m/s. Calculate the magnitude of the initial angular momentum of the system by

asked by Celeste on March 27, 2013
7. ## Physics

A braking system is used to prevent the car travelling faster than 27 m s–1.The car and passengers shown in the diagram have a total mass of 750 kg. The length of track from P to Q is 80 m. Calculate the average braking force that would be required if

asked by tania on February 16, 2011
8. ## 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

asked by Stephen on April 8, 2010
9. ## Physics

A 61.8 kg skier coasts up a snow-covered hill that makes an angle of 26.0° with the horizontal. The initial speed of the skier is 6.10 m/s. After coasting a distance of 1.86 m up the slope, the speed of the skier is 4.48 m/s. Calculate the work done by

asked by Fallon on April 29, 2010
10. ## Honors Chemistry

If 72.4 kJ of heat is supplied to a 752 g block of metal, the temperature of the metal increases by 9.95°C. Calculate the specific heat capacity of the metal in J/g·°C. I cannot find the information in my textbook, and I don't understand the equation

asked by Elisheva on July 21, 2014
11. ## Chemistry

The homework question is : Calculate the Delta H for the following reaction: C6H6 + O2 -> C + H2O(l) State whether the reaction is exothermic or endothermic. I'm not sure where to go with this but so far I balanced out the formula to this C6H6 + (3/2)O2 ->

asked by Alexa on December 1, 2014
12. ## physics

a shot-putter throws the shot with an intial speed of 14 m/s at a 40 degree angle to the horizontal. Calculate the horizontal distance traveled by the shot if it leaves the athlete's hand at a height of 2.2m above the ground. i got to answers which is

asked by someone on August 1, 2009
13. ## Chemistry

I am unsure of how to approach this question, any help would be greatly appreciated! "2.085g of PCl5 were heated to 250°C in a 500mL vessel: PCl5 (g) ⇌ PCl3 (g) + Cl2 (g) Calculate the initial concentration of PCl5. At equilibrium the concentration of

asked by ChemGeek on May 27, 2012
14. ## physics

A body of mass 5.0kg slides from rest down a plane inclined at 30degrees to the horizontal. After sliding 12m down the plane it is found to have a speed of 10m/s. a) How much work has been done in overcoming friction along the plane? b) Calculate the

asked by sand on June 13, 2012
15. ## Chemical Engineering

High-pressure helium is available from gas producers in 0.045-m^3 cylinders at 400 bar and 298 K. Calculate the explosion equivalent of a tank of compressed helium in terms of kilograms of TNT. Assume helium is an ideal gas

asked by Anonymous on March 18, 2015
16. ## physics

A 64.9 kg skier coasts up a snow-covered hill that makes an angle of 25.4° with the horizontal. The initial speed of the skier is 8.67 m/s. After coasting a distance of 1.92 m up the slope, the speed of the skier is 4.33 m/s. Calculate the work done by

asked by Fallon on May 9, 2010
17. ## science

A researcher put 10.0 moles of N2O into a 2-L container at some temperature where it decomposes according to the following: N2O = 2N2+ O2. At equilibrium 2.20 moles of N2O remain. Calculate the Kc for the reaction. How am I supposed to fill in the ICE

asked by Laury on April 6, 2017
18. ## Chemistry

The free energy of a single electron falling through a potential difference of one volt is 1 electronvolt (eV). Therefore, on a per electron basis, x volts → x eV. Calculate the maximum wavelength of light (in nanometers) that provides enough energy to

asked by Bryan on May 6, 2012

i Need help, using loops, visual studio 2013. write a program using loops that will calculate the following, how much would $24 deposited in a bank in 1626, have been worth at the end of this year if it had received an interest rate of 6% compounded asked by Jane on December 1, 2015 20. ## Chemical Engineering High-pressure helium is available from gas producers in 0.045-m^3 cylinders at 400 bar and 298 K. Calculate the explosion equivalent of a tank of compressed helium in terms of kilograms of TNT. Assume helium is an ideal gas asked by Anonymous on March 18, 2015 21. ## physics A 64.9 kg skier coasts up a snow-covered hill that makes an angle of 25.4° with the horizontal. The initial speed of the skier is 8.67 m/s. After coasting a distance of 1.92 m up the slope, the speed of the skier is 4.33 m/s. Calculate the work done by asked by Fallon on May 11, 2010 22. ## physics you are a pilot on an aircraft carrier. you must fly to another aircraft carrier, now 1,450km at 45 degres of your position, moving at 56 km/h due east. the wind is blowing from the south at 72 km/h. calculate the heading and air speed needed to reach the asked by john on October 17, 2010 23. ## economics First,label the following scenarios as to whether they would create a producer or consumer surplus. Then, after you have labeled each scenario, calculate the ensuing surplus. Claire is trying to sell her used calculus textbook online. She asks for$150 or

asked by marg on October 10, 2014
24. ## Physical science

The bullet strikes a stationary of 5kg wooden block fixed to a flat,horizontal table.the bulletis brought to the rest after travelling a distance of 0,4m into the block.calculate the magnitude of the average force exerted by the block on the bullet

asked by Kabelo on April 25, 2016
25. ## Physics 1

A 64.9 kg skier coasts up a snow-covered hill that makes an angle of 25.4° with the horizontal. The initial speed of the skier is 8.67 m/s. After coasting a distance of 1.92 m up the slope, the speed of the skier is 4.33 m/s. Calculate the work done by

asked by Fallon on May 5, 2010
26. ## Chemistry

Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) ⇌ PCl3(g) + Cl2(g) A 0.304 mol sample of PCl5(g) is injected into an empty 4.75 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g) at

asked by Dee on April 2, 2013
27. ## Science

We know the next following bond energies: C≡O: 1 075 kJ; H−H: 435 kJ; C−H: 393 kJ; C−O: 356 kJ; O−H: 464 kJ. With that, a) Calculate how many kJs of energy are required to break all the simple bonds in 0,2 moles of CH4. b) With the energy bonds,

asked by Amy on September 3, 2018

The following data concerns a tennis ball at a given instant before it is struck by a tennis racket; horizontal momentum of tennis ball= 2.4Ns kinetic energy of ball= 45J a) why is correct to give the direction of the momentum but not the kinetic energy b)

asked by Kim on October 15, 2006
29. ## Fancial management

Submit your work via My Assignments. 1. Bob’s Country Bunker (BCB), a chain of economically priced motels in the Midwestern United States has reviewed its current target structure of 40% debt and 60% equity. It can issue debt at a rate of 9%. The last

asked by howard on February 13, 2012
30. ## chemistry

The given reaction, cyclopropane propene (isomerization), follows first-order kinetics. The half-live was found to be 4.57 min at 796 K and rate constant was found to be 0.0328 s-1 at 850 K. Calculate the activation energy (in kJ/mol) for this reaction.

asked by bobjahng2 on November 23, 2010
31. ## Chemistry

I'm working on a problem dealing with calculating the heat of vaporization for vapor pressures problem. By substituting the problems values into the Clausuis-Clapeyron equation I get: .642= (2.28x10-5) x Delta H vap (J/mol) However, from this point I don't

asked by Marcus on March 11, 2013
32. ## physics

A person notices a mild shock if the current along a path through the thumb and index finger of one hand exceeds 80 ìA. In volts, calculate the maximum allowable potential for a hand with moist skin with a resistance of 67.7 kÙ. please help i am getting

asked by crystal on March 10, 2011
33. ## Chemistry

Calculate the entropy change of the universe (in J/K) when 43.4 g of ethanol vapor is condensed in a laboratory at 20.4 oC. Report your answer in scientific notation to three significant figures. If something is condensed, does that mean the system gaines

asked by Student on January 27, 2008
34. ## chemistry

5. Meals-ready-to-eat (MREs) are military meals that can be heated on a flameless heater. The heat is produced by the following reaction: Mg(s) + 2H2O(l) --> Mg(OH)2(s) + H2(g) Calculate the number of grams of Mg needed for this reaction to release enough

asked by tra on May 14, 2013

Sandy Sanders has an hourly wage of $15.00 and is paid time and one half for all overtime after 40 hours. Calculate Sandy’s gross pay for the week of August 13 for which she worked the following number of hours. Sunday: Monday: 8.5 Tuesday: 9.5 asked by George on September 14, 2011 36. ## Chemistry An unknown compound analyzes to be 42.85% C, 7.20% H, and 49.95% N. A 0.915 g sample of the gas occupies 250. mL at 760. mm Hg and 100.°C. Type your answers using the format CH4 for CH4. Enter the elements in the order given. I have calculated the asked by Megan on May 2, 2010 37. ## chemistry Calculate the molecular formula of nicotine (CxHyNz, xyz being unknown)if 4.38 mg of this compound burns to form 11.9 mg of carbon dioxide and 3.41mg of water, and 3.62 g of nicotine changes the freezing point of 73.4g of water by .563C. Show all work. I asked by Anonymous on February 11, 2010 38. ## chemistry A set of bookshelves rests on a hard floor surface on four legs, each having a cross-sectional dimension of 3.9 6.5 cm in contact with the floor. The total mass of the shelves plus the books stacked on them is 260. kg. Calculate the pressure in pascals asked by Silena on February 27, 2014 39. ## Math What is the dollar amount for the cement needed for a sidewald that is 4 inches thick, 3 feet wilde, and 40 feet long if the cement is sold for$76 petr cubic yard. Calculate the problem using fractions to avoid rounding errors caused by repeating

asked by Alice on May 6, 2013
40. ## chemistry

A set of bookshelves rests on a hard floor surface on four legs, each having a cross-sectional dimension of 3.9 6.5 cm in contact with the floor. The total mass of the shelves plus the books stacked on them is 260. kg. Calculate the pressure in pascals

asked by Matthew on September 30, 2012
41. ## Chemistry - Gravimetry

A commercial algaecide containing an organocopper compound was treated with concentrated nitric acid and evaporated to dryness. After dissolution of the residue, the copper was precipitated with -benzoin oxime. If the sample weighed 15.443 g and the

asked by Jill on January 16, 2012
42. ## URGENT PHYSICS

A hammer thrower accelerates the hammer (mass = 7.30 kg) from rest within four full turns (revolutions) and releases it at a speed of 21.0 m/s. Assuming a uniform rate of increase in angular velocity and a radius of 0.80 m, calculate the angle of this

asked by Sam on February 2, 2014
43. ## Algebra

Calculate the average density of planet Pluto, given its mean distance from the sun is 5.91×109 km, its radius is 1137 km, its volume is 6.157×109 km3, its orbital period is 248.1 years and its mass is 1.25×1022 kg. Report the density in g/cm3, without

asked by JS on September 4, 2013
44. ## accounting

The following information was available as of the close of business June 1, 2004 on government of Canada bonds. Coupon...Maturity.....Price.....Yield 5.00%......June 1, 2005......102.35......2.60 10.50%......June 1, 2006......113.91......3.26

asked by Anonymous on May 1, 2017
45. ## Chemistry

A set of bookshelves rests on a hard floor surface on four legs, each having a cross-sectional dimension of 2.7 5.2 cm in contact with the floor. The total mass of the shelves plus the books stacked on them is 246 kg. Calculate the pressure in pascals

asked by Courtney on December 1, 2012
46. ## physics

A Norwegian hydroelectric power plant is built on a small river. The water falls 400m from the mountains to the turbines. The flow is 80 m3/s. Calculate: a) the produced electric power; b) the value of production of one day (unit price = 10 cnt/kWh). The

asked by winget on September 30, 2010
47. ## physics

The infamous German "Paris gun" was used to launch a projectile with a flight time of 170 s for a horizontal distance of 122 km. Based on this information, and ignoring air resistance , calculate (a) the gun's muzzle speed and (b) the angle, measured above

asked by Susan on February 25, 2013

Mr Gopal left 3/10 of his fortune to his wife. Of the remainder, 1/10 was donated to charity and the rest was distributed among his 4 children , A , B , C and D in the ratio of 4:3:3:2 . If $63000 was given to charity, calculate (a)the amount received by A asked by Jason on May 18, 2012 49. ## Physics a rocket of mass 1000kg containing a propellant gas of 3000kg is to be launched vertically. If the fuel is consumed at a steady rate of 60kg per seconds, calculate the least velocity of the exhaust gas if the rocket and content will just lift off the asked by Michael on March 3, 2018 50. ## Chemistry Larger amounts of methane, in the form CH4*6H20 is trapped at the bottom of the ceans in Clatharate compunds (formed when small molecules occupy the empty spaces in cage like structures). Calculate the mass of methane gas trapped with in one Kg of the asked by Devin Boutte on November 20, 2011 51. ## Analytical chemistry A 0.6334 gram of sample of impure mercury (II) oxide was dissolved in an unmeasured excess of potassium iodide. Reaction: HgO + 4I- + H2O ------→HgI42- + 2OH- Calculate the % HgO in the sample if titration of the liberated hydroxide required 42.59 ml of asked by Anonymous on February 6, 2013 52. ## chem 1. A 4.61 g sample of one of the substances listed in the table below was heated from 21.3°C to 315.7°C, requiring 190 J to do so. What substance was heated? I got mercury(l) 2. Calculate the energy required in joules and calories to heat 33.9 g of asked by james on January 27, 2015 53. ## Physics A hammer thrower accelerates the hammer (mass = 7.30 kg) from rest within four full turns (revolutions) and releases it at a speed of 21.0 m/s. Assuming a uniform rate of increase in angular velocity and a radius of 0.80 m, calculate the angle of this asked by Liam on February 2, 2014 54. ## science Which example describes a method of relative dating? A. using fossils to determine the oldest rock layer in a canyon B. using radioactive isotopes to calculate the age of a rock C. measuring the depth of tree bark D. examining historical records to asked by dominique on December 4, 2012 55. ## Physics A short-putter throws the shot with an initial speed of 16 m/s at a 32 degree angle to the horizontal. Question: Calculate the horizontal distance traveled by the shot if it leaves the athletes hand at a height of 2.05 m above the ground? - 45.8m was not asked by Mrs. Jones on June 10, 2012 56. ## chemistry Calculate the volume of fuel needed for a flight if the jet fuel has a density of 0.803kg/L.First use dimensional analysis to convert liter to grams.Then substract to find how many kilograms need to be added.then convert this mass into liters,This is a asked by treasa on September 9, 2014 57. ## chem I'm suppose to calculate the weight percent per volume (grams pre 100cm3) of ethanoic acid in a commercial sample of vineger from the following: (a) 0.4321g of pure momoprotic acid( formula weight 204.2 amu) required 23.45cm3 of naoh for neutralizalion. asked by hammie on February 13, 2012 58. ## chem a 50ml aliquot sample of vinegar is titrated with a 0.078 M NaOH sol'n. The phenolpthalein end point was reached after the addition of 35.6 ml. Equation: HC2H3O2 + NaOH _____> NaC2H3O2 + H20 Calculate the % by mass/vol. of acetic acid in the sample. asked by jane on September 23, 2014 59. ## Chemistry Copper metal can be obtained by heating copper oxide in the presence of carbon monoxide, CO, according to the reaction: CuO(s) + CO(g) --> Cu(s) + CO2(g) Calculate Delta H° in kJ using the following thermochemical equations. Reactions 2CO(g) + O2(g) --> asked by Jordin on October 13, 2010 60. ## Chemistry Calculate the temp at which the reaction (2POCL3(g) -> 2PCl3(g)+O2(g))would become spontaneous. Given: DH= +572kJ and DS= 179 J/K. Would the answer be 298 K? I found DG to be 518.658 kJ, and then plugged in all the values to DG= DH-TDS. Or, should I ignore asked by Anonymous on April 11, 2010 61. ## sicence Which example describes a method of relative dating? A. examining historical records to determine when a volcano erupted B. using radioactive isotopes to calculate the age of a rock C. measuring the depth of tree bark D. using fossils to determine the asked by megan on October 23, 2013 62. ## physics. PLEASE HELP Where do I start? Calculate the water pressure at the bottom of the 50-m {\rm m}-high water tower shown in the photo. Express your answer to two significant figures and include the appropriate units. The question says to neglect the pressure due to asked by Anonymous on April 4, 2014 63. ## math salesman is paid a commission of 2% on goods sold worth over Ksh 100 000. He is also paid a monthly salary of Ksh 12 000. In a certain month, he sold 360 handbags at Ksh 500 each. Calculate the salesman earnings that month Total earned = salary + asked by kd on November 3, 2018 64. ## AP Chemistry This is part of a marathon problem, we have to identify the five compunds of H, N, and O described below. For each compound, I have to write a Lewis structure that is consistent with the information given. a.) All the compunds are electrolytes, although asked by Kristin on December 4, 2011 65. ## Physics A projectile is fired at an angle of 60degree with the horizontal and with the initial velocity 80m/s calculate (a) the time of flight(b)time to reach maximum height(c)it range(d)the velocity of projection 2seconds after been fired asked by Sugarkanpaw on October 5, 2010 66. ## Chemistry When 9.08 times 10^5 grams (one ton) of sodium chloride are electrolyzed in the commerical production of Chlorine, 5.24 times 10^5 grams of Chlorine are produced: 2 NaCl (aq) + 2 H2O (l) >>H2 (g) + Cl2 (g) + 2 NaOH (aq). Calculate the percentage yield. asked by Shane on June 10, 2013 67. ## Chemistry When 9.08 times 10^5 grams (one ton) of sodium chloride are electrolyzed in the commerical production of Chlorine, 5.24 times 10^5 grams of Chlorine are produced: 2 NaCl (aq) + 2 H2O (l) >>H2 (g) + Cl2 (g) + 2 NaOH (aq). Calculate the percentage yield. asked by Shane on June 10, 2013 68. ## CHEMISTRY AP Using Heisenberg's uncertainty principle, calculate the uncertainty in the position of the following. a 1.32-mg mosquito moving at a speed of 1.61 m/s if the speed is known to within ± 0.01 m/s I used the principle and got 2.48e-29 its wrong..and since asked by Karina on October 23, 2011 69. ## physics Consider a frictionless track as shown in the figure below. A block of mass m1 = 4.20 kg is released from A. It makes a head on elastic collision at B with a block of mass m2 = 9.00 kg that is initially at rest. Calculate the maximum height to which m1 asked by john on February 17, 2012 70. ## physics A screen is placed 50cm away from a slit lit by a monochromatic light of wavelength 690nm. The distance seperating the first dark fringe and the third dark fringe in the diffraction pattern is 3mm. Calculate the width of the slit. asked by angy on February 1, 2017 71. ## physicss A 0.145 kg baseball pitched at 44.0 m/s is hit on a horizontal line drive straight back toward the pitcher at 52.0 m/s. If the contact time between bat and ball is 3.00 ✕ 10-3 s, calculate the average force between the ball and bat during contact. asked by Bob on January 29, 2015 72. ## Chemistry An element has ccp packing with a face-centered cubic unit cell. Its density is 8.92 g/cm3 and the unit cell volume is 4.72 x 10-26 L. Calculate the molar mass (g/mol) of the element to three significant figures. asked by Kristina on May 16, 2009 73. ## physics When you bungee jump,you are falling under free fall untill you reach the end of the elastic rope bungee jump organisers must use the weight of a jumper to calculate the length of elastic to use.why is this calculatoin important? asked by Anonymous on March 17, 2012 74. ## Physics 3. A calorimeter has a mass of 100g and a specific heat of 0.900 cal/g˚C and contains 400g of water at 40˚C. When 91g of ice at 0.0˚C is added and completely melted, the temperature of the water is 18.2˚C. Calculate the heat fusion of the ice asked by Mark jay on April 20, 2017 75. ## physics Consider a frictionless track as shown in the figure below. A block of mass m1 = 4.25 kg is released from A. It makes a head on elastic collision at B with a block of mass m2 = 10.0 kg that is initially at rest. Calculate the maximum height to which m1 asked by sam on October 17, 2010 76. ## chemistry A 2.30 mole quantity of NOCl was initially in a 1.50 L reaction chamber at 400°C. After equilibrium was established, it was found that 20.0 percent of the NOCl had dissociated: 2NOCl(g) 2NO(g) + Cl2(g) Calculate the equilibrium constant Kc for the asked by Anonymous on March 17, 2011 77. ## physics please help!! A 0.267kg ball is thrown straight up from 2.20m above the ground. Its initial vertical speed is 9.20m/s. A short time later, it hits the ground. Calculate the total work done by the force of gravity during that time. asked by archi on October 11, 2011 78. ## biomechanics a shot is released at a height of 1.89m, with a speed of 13m/s and at an angle of 34 degrees. Calculate the maximum height reached and the time at which this occurs, the range and the time of flight, and the optimum projection angle. asked by J on February 16, 2012 79. ## chemistry I don't understnad why I got this question worng: The question asks given the following solubilities, calculate the value of the Ksp for the compound: Zinc carbonate, 3.87 x 10^-6 mol/L My answer: AnCO3 -----> Zn + CO3 There exists a 1:1 ratio between Zn asked by Jessica on March 31, 2008 80. ## math a shot is released at a height of 1.89m, with a speed of 13m/s and at an angle of 34 degrees. Calculate the maximum height reached and the time at which this occurs, the range and the time of flight, and the optimum projection angle. asked by J on February 16, 2012 81. ## math green eggs 2.25 regular eggs 2.00 ham 1.50 bacon 1.25 small drink 0.75 large drink 1.00 today's special 4.25 ticket #5 2(G+H) what was ordered? what was the cost>? what method did you use to figure out? what is another way to calculate the price for ticket asked by kathy on August 13, 2015 82. ## Physics I got to do one last exercise: From the specifications of the function generator calculate the standard uncertainty of the amplitude of a 1 V (peak) sinusoidal signal of 1 kHz. The specifications say that: Accuracy at 1kHz = +/- 1% of the specified output asked by Arnau EC on May 31, 2018 83. ## Physics A 0.145 kg baseball pitched at 37.5 m/s is hit on a horizontal line drive straight back toward the pitcher at 48.0 m/s. If the contact time between bat and ball is 3.50×10^−3 s, calculate the average force between the ball and bat during contact. asked by Linda on November 10, 2010 84. ## physics Water flows (v approx. 0) over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency. asked by Kim on October 5, 2010 85. ## Hydrology I have no idea how to calculate this, I just need some direction please (like an equation)? Consider a drainage basin 187 km2. How much water is produced (m3) if 2.5 inches of rain falls on the basin? How many people could be supported on the water asked by Shelly on January 28, 2015 86. ## Physics A gas cylinder has a volume on 200l, and contains Nitrogen at a pressure of 200kPa and a temperature of 290 degrees Kelvin. The molar mass of Nitrogen is 14.0067g. Calculate. The number of moles in the gas cylinder? asked by John on December 4, 2015 87. ## chem Using the values given, calculate the amount of heat that is liberated when a 2.7-kg bucket of steam at 100.0°C is cooled to give a 2.7-kg bucket of water at 28.0°C. (Condensing steam has −ÄvapH = −2440 J/g and cooling water has cliq = 4.184 asked by Rukky on January 26, 2011 88. ## AP Physics Two adjacent natural frequencies of an organ pipe are found to be 900 Hz and 990 Hz. (a) Calculate the fundamental frequency and length of this pipe. other info that I already calculated: -the pipe is open at both ends - length of pipe is 1.89m asked by Ayesha on April 26, 2015 89. ## General Chem Nitrogen oxide reacts with oxygen gas to form nitrogen dioxide (NO2). In one experiment 0.866 mole of NO is mixed with 0.503 mole of O2. Calculate the number of moles of NO2 produced asked by Alexis on October 12, 2012 90. ## Electronic engineering Three resistors of resistance 50,30,40 ohms are connected in series across 100V suppliers. (I).Draw circuit (II).Calculate the total resistance. (III).Total current flowing through the circuit. (v). Voltage drop across each resistor. asked by Sammy on September 19, 2017 91. ## Physics An object with mass 5.0 kg is attached to a spring with spring stiffness constant 192 N/m and is executing simple harmonic motion. When the object is 0.35 m from its equilibrium position, it is moving with a speed of 0.02 m/s. Calculate the amplitude of asked by Anonymous on March 5, 2013 92. ## chemistry How do you figure out the answer for the reverse reaction? At 350 K the value of Kp for the equilibrium represented by the balanced equation is 2.87 x 10-2. Calculate the value of Kc for the reverse reaction at the same temperature. Express answer in asked by andy on April 13, 2010 93. ## physics Consider a frictionless track as shown in Figure P6.48. A block of mass m1 = 4.30 kg is released from A. It makes a head on elastic collision at B with a block of mass m2 = 9.00 kg that is initially at rest. Calculate the maximum height to which m1 rises asked by luke on July 16, 2010 94. ## Chemistry Is my answer correct? Calculate the mass of frost (water ice) on a piece of dry ice that would completely react with 2 mmol of phenylmagnesium bromide. (1/44 CO2)*(0.002mol of phenylmagnesium bromide)= 0.0000455 asked by Anonymous on November 9, 2014 95. ## chem When NH3 is treated with oxygen gas, the products obtained are N2(g) and H2O(l). If standard enthalpies of formation at 298 K for NH3(g) and H2O(l) are –46.00 kJ/mol and –286.0 kJ/mol respectively, calculate the enthalpy change of the reaction. asked by shana on January 27, 2015 96. ## accounting If I needed to find out OR calculate the weighted average cost of capital (WACC) for the company General Electric (GE), how would I find this information or what is needed from the company financial statements to aid me in coming up with the answer? asked by Bulldog 42 on July 6, 2009 97. ## Physics Water flows approx. 0 over a dam at the rate of 660 kg/s and falls vertically 86 m before striking the turbine blades. Calculate the rate at which mechanical energy is transferred to the turbine blades, assuming 53% efficiency. asked by Rick on October 6, 2010 98. ## Maths A television set is on sale for$780 cash, or 25% deposit and \$85 per month for 8 months. How much can be saved by paying cash? How much is charged in interest? Calculate the annual rate of simple interest charged? Working out please:)

asked by Janet on March 16, 2011
99. ## physics

A submarine is stranded on the bottom of the ocean with its hatch 25.0 m below the surface. Calculate the force needed to open the hatch from the inside, given it is circular and 0.450 m in diameter. Air pressure inside the submarine is 1.00 atm.