# 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 406
1. ## Physics

An organ pipe open at both ends has a harmonic with a frequency of 480 Hz. The next higher harmonic in the pipe has a frequency of 540 Hz. Calculate the frequency of the fundamental and the length of the pipe. I know 540/480 is 9/8. I have no idea where to

asked by Rachel on January 26, 2011
2. ## chemistry

Calculate the amount of moles in CH3COOH which is 5%acedic acid and C3H7OH which is 70% usp? This is what I got.....For the amount of 50 ml -> 50mL = 50g ->50g/18.016 = 2.7 moles in 50 ml of H2O For the amount of 50 ml -> 50mL = 50g ->50g/60.09500 g = .83

asked by Will J on December 11, 2011
3. ## Econ

Total value of all assets in US YEAR ...total value of all final services in US ...total value of all final goods in US ...final goods and services produced by American firms in other countries ^ If I knew everything above, how would I calculate the GDP

asked by Evan on July 3, 2009
4. ## maths

sarah invested £12000 in a unit trust 5 years ago, the value of the unit trust increased by 7% per annum for each of the last 3 years. before this the price had decreased by 3% per annum. calculate the current price of the unit trust

asked by hayden on October 26, 2017
5. ## physics

Socola and Brooke are balanced on a teeter-totter plank as shown below. Socola has a mass of 7.7 kg, and Brooke’s mass is 53 kg. Brooke is located 1.0 m from the pivot. Assume the plank is massless, and calculate how far Socola is from the pivot (x).

asked by buddy on July 29, 2013
6. ## chemistry

Calculate the amount of moles in CH3COOH which is 5%acedic acid and C3H7OH which is 70% usp? This is what I got.....For the amount of 50 ml -> 50mL = 50g ->50g/18.016 = 2.7 moles in 50 ml of H2O For the amount of 50 ml -> 50mL = 50g ->50g/60.09500 g = .83

asked by Will J on December 11, 2011

x^2-3x+2

8. ## AlgebraB-2

I need help with figuring out how to do these problems to get the right answer. Appreciate any help. Thanks. Multiple choice: 1. What is the value of n so that the expression x² + 12x + n is a perfect square trinomial? 6 36 72 144 2. What are the

asked by Jennifer W. on March 20, 2013
9. ## Quantum Computing

In this problem, we will carry out some steps of the quantum factoring algorithm for N=21. (a) What is the period k of the periodic superposition set up by the quantum factoring algorithm if it chooses x=2? In other words, what is the period of f(j)=2^j

asked by imath on September 22, 2013
10. ## science

when copper metal is added to silver nitrate in solution, silver metal and copper (II) nitrate are produced. what mass of silver is produced from 100.g Cu?

asked by Sandy on April 19, 2016
11. ## Chemistry

Explain Why some ionic compounds are soluble in water. Explain why non-ionic compounds, such as ethanol or sugar are soluble in water. Explain what a saturated solution.

asked by Allison on March 10, 2015
12. ## MATH 157

How do I determine the real number solution for the following problem: The problem reads : Determine the number of real-number solutions to the equation from the given graph. x^2 - x + 15 = 0, given the graph of y = x^2 - x + 15

asked by Janelle on July 29, 2011
13. ## Chemistry

Is dissolving salt in water an example of reversible? I don't think so because once salt is in water, the water is not clear anymore. Pls help. thanks. Yes, it is reversible. One ca physically separate the salt and water (evaporation) What do you mean by

asked by Linda on February 14, 2007
14. ## chemistry.

in the titration between Na2CO3 and HCl... 1) at the first end point what reaction is stoiciometrically complete? 2)At the start of titration where HCl=0 is the solution acidic or basic. ExPlain? 3) At the 2nd end point what reaction is stiociometrically

asked by zoe on March 13, 2011
15. ## intro to chem

disolving sucrose, NaCl< and calcium chloried affect the boiling point of frezing point of water. Assuming that you have 0.1m solution of all these 3 compounds: a)rank then in order of decreasing freezing point. b) rank in order of increasing boiling point

asked by julia on October 27, 2010
16. ## electrical principles

Four resistors , each of 240ohms are connected in parallel , and the group then joined in series with a heater of 40ohms resistance. Then complete circuit is connected to a 240volts supply . Calculate total resistance in the circuit , the power dissipated

asked by Achwil Solo on March 19, 2015
17. ## Algebra

The cost, in millions, to remove x% of pollution in a pond is modeled by the equation: C=6350/(425-3x) . What is the cost to remove 75% of the pollution? Hint: Plug in and calculate, do not convert to a decimal. Can someone tell me how figure this out step

asked by becca on December 15, 2011
18. ## Chemistry

A sample of gas contains 0.1900 mol of HBr(g) and 9.500×10-2 mol of Cl2(g) and occupies a volume of 11.2 L. The following reaction takes place: 2HBr(g) + Cl2(g)2HCl(g) + Br2(g) Calculate the volume of the sample after the reaction takes place, assuming

asked by Zach on October 8, 2017
19. ## physics

quick answer of a boy is running on a straight road.He run towards north in 2 minutes and 10 seconds and then turn back and runs 200m in one minute.Calculate his average speed and magnitude of average velocity during first 2 minutes and 10 seconds and his

asked by tarun on June 22, 2010
20. ## chemistry

at an equilibrium mixture of PCl5, PCl3, and Cl2 has partial pressures of 217.0 Torr, 13.2 Torr and 13.2 Torr respectively. a quantity of Cl2 is injected into the mixture, and the total pressure jumps to 263.0 Torr (at the moment of mixing). the system

asked by lasya on February 26, 2014
21. ## Physics

So I got a question One 3.5-kg paint bucket is hanging by a massless cord from another 3.5-kg pain bucket, aslo hanging by a massless cord if the buckets are at rest, what is the tension in each cord? How do I do this is this just the normal or what I do

asked by Physics on July 10, 2009
22. ## Physics

A ball is ejected to the right with an unknown horizontal velocity from the top of a pillar that is 50 meters in height. At the exact instant, a carriage moving on rails is also released to the right from the bottom of the pillar. Calculate the velocity

asked by Lauren01 on February 22, 2012
23. ## chemistry

A radio station's channel, such as 100.7 FM or 92.3 FM, is actually its frequency in megahertz (MHz), where 1 MHz =10^6 Hz}. Calculate the broadcast wavelength of the radio station 98.70 FM. can someone please explain this question for me, i tried several

asked by risha on October 23, 2010
24. ## physics

If a car takes a banked curve at less than the ideal speed, friction is needed to keep it from sliding toward the inside of the curve (a real problem on icy mountain roads). (a) Calculate the ideal speed to take a 95 m radius curve banked at 15°. m/s (b)

asked by Shonda on July 21, 2014
25. ## Physics

The note D above middle C has a frequency of 294 cycles per second, and the note E has a frequency of 330 cycles per second. A driver of a moving car sounds the horn, which emits an E tone, but a stationary observer hears a D tone. Calculate the speed at

asked by Tom on April 25, 2018
26. ## chemistry

at an equilibrium mixture of PCl5, PCl3, and Cl2 has partial pressures of 217.0 Torr, 13.2 Torr and 13.2 Torr respectively. a quantity of Cl2 is injected into the mixture, and the total pressure jumps to 263.0 Torr (at the moment of mixing). the system

asked by lasya on February 25, 2014
27. ## physics

A glass bottle full of mercury has mass 500g. On being heated through 35 degree census, 12.43 gram of mercury expelled. Calculate the mass of mercury remaining in the bottle (cubic expansivity of mercury is 1.8 * 10 raise to power -4 pre Kelvin, linear

asked by poppy on April 23, 2019
28. ## Algebra 2

suppose you have 10 green marbles, 10 gold marbles, and ten black marbles. You also have 3 bags. Your plan is to ask a friend to randomly select a marble from one bag. How should you distribute all the marbles amongthe 3 bags to maximize the probability

asked by Ann-Marie Guischer on February 7, 2012
29. ## math

The trunk of a leaning tree makes an angle of 12 degrees with the vertical. To prevent the tree from falling over, a 35.0 m rope is attached to the top of the tree and is pegged into level ground some distance away. if the tree is 20.0 m from its base to

asked by Yiu on April 28, 2015
30. ## math

Two different relationships are shown below. Relationship 1: xy = 3 Relationship 2: A graph is shown that has the following points plotted: one comma three, two comma six, three comma nine, four comma twelve. a) Identify each relationship as direct or

asked by erika on April 16, 2013
31. ## Math 9 algebra

A mechanic charges \$70 an hour plus the cost of parts to repair a vehicle. The parts cost \$215 for the repair on Tamara's car. A) write an expression for the total cost, C, of repairing Tamara's car for any numbers of hours, n. B) use the expression you

asked by Molly on January 26, 2013
32. ## Math

A ball is dropped from a height of 36 feet. The quadratic equation d=1/2 gt^2 is used to calculate the distance (d) the ball has fallen after t seconds. The constant g is the acceleration of gravity, 9.8m/s^2. How long does it take the ball to hit the

asked by Lux on November 19, 2012
33. ## Maths

A metal sphere of diameter 12cm is metted to formed a sphere of diameter 6cm calculate the number of sphere formed from the metal sphere

asked by Dayo on January 14, 2013
34. ## physics

A force of 100 Newtons acts upwards on a mass of 50 kg, another force of 60 newtons acts on the same mass downwards. calculate the accleration in which direction will be the accleration

asked by Haley on January 16, 2011
35. ## math

1.) when the expression 4x^2-3x-8 is divided by x-a, the remainder is 2. find the value of a. 2.) the polynomial 3x^3+mx^2+nx+5 leaves a remainder of 128 when divided by x-3 and a remainder of 4 when divided by x+1. calculate the remainder when the

asked by Nialleen on August 4, 2014
36. ## Physics

Two forces 18N and 10N are inclined at right angle of 60° to each other. calculate (i) the resultant force (ii) the angle of resultant forces that makes the force of 10N.

asked by Gabby on January 28, 2017
37. ## Chemistry

Ethyl alcohol which is prent in many beverages molecular formular C2H6O.If 9.2g of ethyl alcohol are available.Calculate number of molecular of ethyl alcohol 9.2g of ethyl alcohol.

asked by Anonymous on March 24, 2013
38. ## Finance

Calculating Beta... Hi I need help... I need to calculate Beta and Here is what is given. Please if you can explain how... Here's the given X's StdDev of monthly return = 12% with a 0.80 market correlation. The StdDev of Market monthly return is 6%

asked by Dantes on October 4, 2011
39. ## chemistry calculations

At some temperature,the reaction PCl3(g) +Cl2(g) ====PCl5(g) is at equilibrium when the concentration of PCl3, Cl2, and PCl5 are 10, 9.0, and 12mol/L, respectively. Calculate the value of Kc for this reaction at that temperature.

asked by =) on August 30, 2014
40. ## chemistry calculations

At some temperature, the reaction PCl3(g)+Cl2(g)====PCl5(g) is at equilibrium when the concentration of PCl3, Cl2, and PCl5 are 10, 9.0, and 12 mol/L, respectively. Calculate the value of Kc for this reaction at that temperature.

asked by =) on August 19, 2014
41. ## Physics

The critical angle of glass is 41degree 48 seconds and that of water is 48 degree 36 seconds.calculate critical angle of the glass water interface?

asked by Gash on March 13, 2019
42. ## Finance

Currently, there are 560,000 shares outstanding at \$85 each. There will be 65,000 new shares offered at \$84 each. Calculate each of the following: • The new market value of the company. • 560,000(\$85) + 65,000(\$60) • 47,600,000 + 3,900,000 • =

asked by Anonymous on December 16, 2013
43. ## Chem

The following results were obtained when a sample of pineapple juice was analyzed to determine its vitamin C content. A 19.8 mL sample of pineapple juice was placed in a flask with 20 ml of 0.5 M H2SO4, 1.0 g of potassium iodide, KI, and 25.00 mL of

asked by Anonymous on May 5, 2014
44. ## Chemistry

Find the concentration of H3O if the pOH of a solution is 11.700: So far I have: pH= 14.000- pOH which is 14.000-11.700=2.300 pH = -log[H3)] -2.300 = log[H3O] Lost after that!!! Help please.

asked by Lucy on December 2, 2007
45. ## Operations Research

The Ploughman family farm owns and operates a 640-acre farm that has been in the family for several generations. The Ploughman’s always have had to work hard to make a decent living from the farm and have had to endure some occasional difficult years.

asked by Meme on April 22, 2013
46. ## science calculation

You have been asked to complete a screening-level risk assessment in order to compare routes of chemicals exposure and to determine whether the chemical exposure poses a potential health risk. The receptor is a 70 kg man who has worked 8 hours per day as

asked by Reena! plse help on July 7, 2009
47. ## college physics

Suppose a 69 kg person stands at the edge of a 7.8 m diameter merry-go-round turntable that is mounted on frictionless bearings and has a moment of inertia of 1600 kg*m^2. The turntable is at rest initially, but when the person begins running at a speed of

asked by Anonymous on March 29, 2010
48. ## physics

1) A golf ball is hit from a position that is 4m higher than h ehorizintal area where the ball lands. The intiial velocity of he ballis 30ms-1 at a angle of 0 above the horizintal a)show that the maximum height of the ball above the landing area is

asked by 0ooooooooo0 on September 28, 2017

1) Calculate the cell potential, at 25 C, based upon the overall reaction Zn2+(aq) + 2 Fe2+(aq) -> Zn(s) + 2 Fe3+(aq) if [Zn2+] = 1.50 x 10^-4 M, [Fe3+] = 0.0200 M, and [Fe2+] = 0.0100 M. The standard reduction potentials are as follows: Zn2+(aq) + 2

asked by Chris on May 3, 2014
50. ## Math

You have \$30 to spend on picking 25 pounds of two different types of fruit at a farm. The apples cost \$1.40 per pound the blueberries cost \$.90 per pound and the cherries cost \$1.10 per pound. You want prices many pounds of apples as the other two fruits

asked by Jude on April 10, 2016
51. ## chemistry

2,4,6-Trinitroanilin can be prepared by nitration of p-nitroaniline with nitrate ions in the acidic solution. Chemical engineer sounds 0.50 grams of p-nitroaniline (dissolved in sulfuric acid) to react with 0.60 g of sodium nitrate (dissolved in sulfuric

asked by jocckee on September 5, 2013
52. ## maths

Two boat A and B left a port at the same time on different route. B traveled on the bearing of 150 degree and A traveled on the north side of B when had traveled 8 kilometer and B had traveled 10 kilometer. The distance between the two boat was found to be

asked by kehinde on May 30, 2016
53. ## Math

Monica wants to know what she needs to get on the exam to get a certain grade in her English class. The term Mark is worth 70% of the course and exam is worth 30%. The following is the formula used to calculate her overall Mark. Course Mark = term Mark +

asked by Emma on February 20, 2017
54. ## Algebra

A cup of coffee contains about 100mg caffeine. The exponential function A(t)=100(0.84)^t is used to calculate the amount of caffeine in a body t hours after the coffee was consumed. Find the amount of caffeine in the body after 4 hours. Can someone help

asked by ##000000 on September 17, 2012
55. ## Physics

For which of the following situations can the equation F = mg not be used to calculate the force due to gravity? a) The pull of gravity on an apple on the surface of the Earth. b) The pull of gravity on an airplane flying at an altitude of 8 km above the

asked by Kelvin on November 19, 2012
56. ## Chemistry

Consider that: the tetravalent cation of an isotope has 78 electrons and 128 neutrons; Nuclear relative mass of the same cation is 1.44% higher than the relative nuclear mass of its most common isotope based on these data, calculate the number of neutrons

asked by William on January 26, 2016
57. ## Knox fields.

A garden in form of a square is surrounded by a path which is 1m wide on two opposite sides and 1^2m wide on the other two opposite sides.if the area of the path is 17m^2.Calculate the perimeter of the garden and the area of the space covered by the garden

asked by Opeyemi on September 15, 2015
58. ## math

Luke build a model train to a scale of 1:25.calculate a copy of the table below using his scale. length of engine on the real x and on the model is 16cm. length of train on the real 20m and x on the model. height of train is x and 12cm on the model.

asked by Vanessa on May 29, 2017
59. ## science

A minibus of mass 3000kg,travelling at a speed of 30m.s to the right,collides with a car of mass 1600kg,travelling at 16m.s to the right. After collision the car continues to travel to the right at a speed of 17,2m.s. Calculate the speed of the minibus

asked by zama on January 24, 2016
60. ## physics

A ball of mass 0.1kg is dropped from a height of 8m into a hard floor and bounces back to a height of 2m calculate the velocity when the ball hits the ground, the velocity with which the ball leaves the ground,the momentum when the ball hits the ground

asked by baby on January 18, 2017
61. ## economics

Calculate REAL GDP for each year (2005=100). Yr. Price of/Qty. Price of/Qty. socks produced hats produced 2005 \$1 100 \$2 50 2006 \$2 150 \$3 100 2007 \$3 200 \$4 150

asked by Julie on April 15, 2008
62. ## ACCOUNTING

If the actual factory overhead applied is more than the actual factory overhead incurred _________. (Points : 1) A a favorable variance is produced B an unfavorable variance is produced C no variance is produced D there is no way to calculate which way the

63. ## Chem

A 53.31-g sample of water at 88.8 degrees C is added to a sample of water at 23.9 degrees C in a constant- pressure calorimeter. If the final temperature of the combined water is 43.3 degrees C and the heat capacity of the calorimeter is 26.3 J/degrees C,

asked by k on November 2, 2012
64. ## Chemistry

The theoretical yield of a reaction is the amount of product obtained if the limiting reactant is completely converted to product. Consider the reaction: P4(s) + 6 Cl2(g) → 4 PCl3(l) If 19.47 g P4 is mixed with 6.85 g Cl2, calculate the theoretical yield

asked by Riley on November 26, 2015
65. ## Chemistry

Consider that: the tetravalent cation of an isotope has 78 electrons and 128 neutrons; Nuclear relative mass of the same cation is 1.44% higher than the relative nuclear mass of its most common isotope based on these data, calculate the number of neutrons

asked by William on January 26, 2016
66. ## physics

n automobile has a vertical radio antenna 1.40 m long. The automobile travels at 30.0 km/h on a horizontal road where Earth's magnetic field is 50.0 µT, directed toward the north and downward at an angle of 65.0° below the horizontal. (a) Specify the

asked by ricky on March 26, 2018
67. ## ACCOUNTING

Same Day Service purchased a new steam press on January 1, for #35,000. It is expected to have a five year useful life and a \$3,000 salvage value same day expects to use the steam press more extensively in the early years of its life. 1.Calculate the

asked by yorkie16 on August 22, 2009
68. ## physics

A 5.9 m wire with a mass of 79 g is attached to the mast of a sailboat. If the wire is given a "thunk" at one end, it takes 0.087 s for the resulting wave to reach the other end. 1. What is the tension in the wire? 2. Calculate the tension for a 89-g wire.

asked by Brienne on December 2, 2012
69. ## chemistry

Gas X has a density of 2.60g/L at STP. Determine the molar mass of this gas. Sorry there was some typos on the previous question. please show me again steps by steps. thank you =] Same answer. You just left the g off the density. One mole of ANY (ideal)

asked by michelle on March 21, 2007
70. ## Waves & Tension

A 5.9 m wire with a mass of 79 g is attached to the mast of a sailboat. If the wire is given a "thunk" at one end, it takes 0.087 s for the resulting wave to reach the other end. 1. What is the tension in the wire? 2. Calculate the tension for a 89-g wire.

asked by Brienne on December 2, 2012
71. ## Finance

Calculate the required rate of return for Mercury Inc. to the nearest .1 Assume that investors expect a 3.0 percent rate of inflation in the future. The real risk-free rate is equal to 5.8 percent and the market risk premium is 9.3 percent. Mercury has a

asked by Lisa on June 4, 2013
72. ## physics

If a car takes a banked curve at less than the ideal speed, friction is needed to keep it from sliding toward the inside of the curve (a real problem on icy mountain roads). (a) Calculate the ideal speed to take a 105-m radius curve banked at 13.0°. km/h

asked by HELP!!! on November 30, 2012
73. ## Chem

Does my work here look right? 3. One mole of an ideal gas expands adiabatically into a vacuum. Calculate q, delta-e, w, and delta-H for the process. q= 0 [adiabatic] w= -Pext(V2-V1) w= 0 delta-e = w + q delta-e = 0 + 0 = 0 delta-h= delta-e + P(delta V)

asked by Jess on February 3, 2007
74. ## Physics Questions!

An interference pattern is set up by two point sources of the same frequency, vibrating in phase with one another. A point on the second nodal line is 50.0 cm from one source and 59 cm from the other. The speed of the waves is 35 cm/s. Calculate the

asked by URGENT on December 15, 2007

Calculate the magnitudes of the gravitational forces exerted on the Moon by the Sun and by the Eart when the two forces are in direct competition, that is, when the Sun, Moon and Eart are aligned with the Moon between the Sun and the Earth. This alignment

asked by Bon oncle on April 28, 2011
76. ## PHYSICS!!!!!!!!!!!!!!!!

the height from where the water bomb will be released on the overpass is 4.5 m and the target student is 170 cm tall. the student realises that, as his target will be moving, he must release the water bomb when his friend is a certain horizontal distance

asked by NEED HELP ASAP!!!!!!!!!!! on October 16, 2012
77. ## PHYSICS!!!!!!!!!!!!!!!!

the height from where the water bomb will be released on the overpass is 4.5 m and the target student is 170 cm tall. the student realises that, as his target will be moving, he must release the water bomb when his friend is a certain horizontal distance

asked by NEED HELP ASAP!!!!!!!!!!! on October 17, 2012
78. ## Algebra

Bobbie delivers pizza after school. The price of each pizza he delivers is \$14. There is also a \$3 delivery charge. To calculate the cost of a customer's order before taxes, he uses the equation t = 14p + 3, where t is the cost before taxes and p is the

asked by Osarhemen Igbinosun on July 24, 2018
79. ## Chemistry

A hydrated MgSO4 salt, weighing 3.211g, is heated in a crucible until reaching a constant weight. The weight of the anhydrous MgSO4 is 1.570 grams. 1. Calculate the moles of H20 removed and the moles of anhydrous MgSO4 remaining in the crucible. 2. What is

asked by Marty on October 20, 2007
80. ## Math

Bobbie delivers pizza after school. The price of each pizza he delivers is \$14. There is also a \$3 delivery charge. To calculate the cost of a customer's order before taxes, he uses the equation t = 14p + 3, where t is the cost before taxes and p is the

asked by Osarhemen Igbinosun on July 24, 2018
81. ## physics

a boy is running on a straight road.He run towards north in 2 minutes and 10 seconds and then turn back and runs 200m in one minute.Calculate his average speed and magnitude of average velocity during first 2 minutes and 10 seconds and his average speed

asked by tarun on June 22, 2010
82. ## Physics

What work is required to stretch a spring of spring constant 500N/m from x1=.2m to x2=.25m? Assume the unstreched position is at x=0. W=Fd so w=(500)(.25-.2) =500(.05) =25J is this correct? Calculate the work required to compress an initially uncompressed

asked by Andrea on October 17, 2007
83. ## math

i've been asked to ifnd the price-earning ratio of some stocks i'm unsure of how to do this I do not know which EPS value to use as I found some valeus on a website... Like for this company that I got a stock for h t t p : / / w w w . m a r k e t w a t c h

asked by Kate on January 4, 2010
84. ## Dobson

a)The element with the greatest density is osmium, which has a density of 22.6g/cm3. Calculate the mass of 32.1 cm3 of osmium. b)A team of students determined the density of a sample of wood to be 0.52 g/cm3. A handbook of chemistry reported the density of

asked by Anonymous on March 26, 2010
85. ## global science

Michael Phelps won the 100 meter butterfly, Phelps swam 100 meters in 50.58 seconds. the 2nd place swimmer swam the 1oo meters in 50.59 seconds. Phelps beat him by 1/100th of a second. Calculate, in inches, the distance Phelps beat Cavic by

asked by Anonymous on September 7, 2010
86. ## satistiks

The weights of male nurses in a hospital are known to be normally distributed with mean ƒÝ = 72 kg and standard deviation ƒã = 7.5 kg. The hospital has a lift (elevator) with a maximum recommended load of 450 kg. Six male nurses enter the lift.

asked by nide on December 1, 2015
87. ## physics

Two identical small spheres of mass 2.0g are fastened to the ends of an insulating thread of length 0.60m The spheres are suspended by a hook in the ceiling from the centre of the thread. The spheres are given identical electric charges and hang in static

asked by Diana on February 9, 2011
88. ## chemistry-gases-ppm

Nitrogen dioxide reacts with water and oxygen in the atmosphere to produce acid rain. 4NO2(g) + 2H2O(g) + O2(g) = 4HNO3(g) Assuming that the temperature and the pressure remain constant, calculate the volume of air at 1 atm, 20 C, necessary to dilute the

asked by Rose Bud on March 1, 2012
89. ## math 116

Will someone please help me slove this problem. A family refers to a group of two or more people related by birth, marriage,or adoption who resides together. In 2,00in Country A, the average family net worth was \$460,000, and there were about 9.3 x 10 to

asked by meka a on March 3, 2013

1) Nitrosyl chloride (NOCl) decomposes at high temperature. The equation is 2 NOCl (g) -> 2 NO (g) + Cl2 (g) at 227oC Using delta Ho = 81.2 kJ and delta So = 128 J/K, calculate the value of the equilibrium constant for this reaction. I do not know how to

asked by Hannah on April 24, 2012
91. ## calculus

Ice cream drips out of the bottom of an ice cream cone on a hot day at a rate of r(t) mL per second, as a child eats it slowly, where t is in seconds. If r(t) = 10 e^{-k t}, complete the definite integral expressing the quantity of ice cream lost in the

asked by ricky on March 8, 2014
92. ## Chemistry 1002

Over a period of time, the concentration of sulfuric acid in a lead storage battery of an automobile has decreased from 38 percent by mass(density=1.29 g/mL) to 26 percent by mass(1.19 g/mL). Assume the volume of the acid remains constant at 715 mL.

asked by Jen on April 19, 2015
93. ## physics

A car with a weight of 15 000 N is being towed up a 20o slope at constant velocity. Friction is negligible. The tow rope is rated at 6 000 N maximum tension. a. Draw the free body diagram, by cleverly choosing the coordinate system. (5 marks) b. Calculate

asked by anonymus on September 2, 2018

Two toy ducks attached to each other by a string, are being pulled by a child. The front duck is m1= 5.0 kg and the back duck is m2= 2.0 kg. The happy guy pulls them with a force of 10 N and friction exists. The toys are moving with constant velocity. A)

asked by Anonymous on October 22, 2014
95. ## Physics

A centrifuge is a common laboratory instrument that separates components of differing densities in solution. This is accomplished by spinning a sample around in a circle with a large angular speed. Suppose that after a centrifuge in a medical laboratory is

asked by Jc on October 23, 2011
96. ## Physics

A girl standing on a stationary uniform plank 10m long. The plank can move with negligible friction along the surface of the water. A) the girl walks along the plank with a velocity of 2ms-1 relative to the plank until she reaches the end of the plank. The

asked by Peter on April 7, 2016
97. ## Math

The radius of a disk grows at 2cm/s. Calculate the growth rate of the disks area when the radius mesures 7 cm. (Designate the area of the disk with A and the radius with r) A) Find the relation between A and r B) Find the derivative of this relation on

asked by Ralph on April 18, 2011
98. ## Math

The radius of a disk grows at 2cm/s. Calculate the growth rate of the disks area when the radius mesures 7 cm. (Designate the area of the disk with A and the radius with r) A) Find the relation between A and r B) Find the derivative of this relation on

asked by Ralph on April 17, 2011
99. ## Physics

A potter’s wheel is spinning with an angular speed of 4.5 rad/s. When the potter stops working, the wheel slows down with an angular acceleration of -0.5 rad/s 2. Calculate the angle, in radians, through which the wheel has turned by the time its angular

asked by Jannia on April 22, 2016
100. ## 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??

asked by Stuck on February 17, 2010