# 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 256
1. ## ipc

Two metal balls have their centers 2.0 meters apart. One has a mass of 6.0 kg and the other has a mass of 8.0 kg. Choose the operation that will calculate the gravitational force between them.

asked by kassandra casias on February 26, 2010
2. ## Math, Physics

Calculate Earth's gravitational force on the ISS astronauts while orbiting at an altitude of 401.5 km above Earth’s surface.

asked by Hooman on January 9, 2017
3. ## chemestry

Calculate the number of moles of NH3 that can be formed from the complete reaction of 0.30 moles of N2 according to the equation N2 + 3H2 → 2NH3

asked by michelle on March 24, 2016
4. ## chemestry

Calculate the number of moles of NH3 that can be formed from the complete reaction of 0.30 moles of N2 according to the equation N2 + 3H2 → 2NH3

asked by Anonymous on March 24, 2016
5. ## phy111

An upward force of 1 2 104N acts on an elevator of mass 2 0 103kg. Calculate the acceleration of the elevator. Take g=9 8ms−2

asked by hart on October 25, 2014
6. ## statistics

help me work out the problem to calculate the difference means distribution parameters n(1)=25, n(2)=36 s(1)square=50, s(2) square=72, M(1)=100,M(2)=105

asked by Cherelle on January 18, 2013
7. ## physics

A body strikes the ground vertically down wards with a velocity u and rebounds with the same speed.Calculate the change in velocity.

asked by Anonymous on June 10, 2012
8. ## Physical science

how can i calculate the number of: 1.molecules in 30g water.2.atoms in 50 dm^3 nitrogen gas.3.nucleons in 10 cm^3 flourine gas?

asked by sandy on May 7, 2011
9. ## Chemistry

Carbon disulfide (CS2) is useful, but flammable, solvent. Calculate DH for the following reaction. CS2(l) + 3O2(g) --> CO2(g) + 2SO2(g)

asked by Anonymous on November 13, 2015
10. ## math

A bicycle wheel has a diameter of 63cm.calculate how many times the wheel turns round in travelling 19.8km. Use the value 3 1/7 for pi

asked by charity on April 18, 2014
11. ## math

a picture which measures 48cm by 40cm is surrounded by a frame which is 1cm wide.calculate the area of the frame

asked by BRATTE on January 14, 2017
12. ## physics

define 1watt of power . a lamp consumes 1000J of electrical energy in 10s calculate its power.

asked by prudhvi on January 16, 2013
13. ## physics

A ball of mass 0.50 kg is thrown vertically upwards, calculate the net force on the ball at the top of its flight

asked by Duy on March 20, 2016
14. ## Algebra

calculate the time for the colony to reach 1 million bacteria. Number of bacteria present. Doubles every minute 2 4 8 16 32 64

asked by Suzanne on March 20, 2016
15. ## physics

Venus has radius 6.05 x 10^6 m and mass 4.87 x 10^24 kg. Calculate the value of acceleration due to gravity on Venus's surface. I don't understand

asked by Jon on April 2, 2008
16. ## Chemistry

Molecular bromine is 24 percent dissociated at 1600 K and 1.00 bar in the equilibrium Br2 (g) = 2Br (g). Calculate Kp at 1600 K.

asked by John on February 6, 2011
17. ## P-Chem

I am a bit confused on working this problem: Given that the work function (ƒÖ) for a metal is 1.82 eV, calculate the threshold frequency for this metal.

asked by suzane on September 15, 2011
18. ## Chemistry

Calculate the partial pressure of helium in a 1.00 L flask that contains equal numbers of moles He, Ne, and Ar at a total pressure of 5.26atm

asked by Randy on April 10, 2012
19. ## chemistry

Calculate the Calorimeter Constant if 25 g of water at 58C was added to 25 g of water at 25C with a resulting temperature of 35C?

asked by bipasha on March 31, 2008
20. ## Math

A force act on a body for 0•5sec and changes its momentum from 16kg. Calculate the 1-magnitude of the force 2-impulse on the ball

asked by Lubnah on January 16, 2017
21. ## Chemistry

Calculate the increase of entropy (in J/K) when 75 g of ice melts at 0 ºC and 1 atm. (The heat of fusion for ice is 6,000 J/mol.)

asked by Emily Couroso on March 31, 2015
22. ## Chemistry

Calculate the heat energy released when 19.6 of liquid mercury at 25.00 C is converted to solid mercury at its melting point

asked by Josh on July 9, 2011
23. ## physics repost

A 1600 kg vehicle moves with a velocity of 19.5 m/s. Calculate the power required to reduce the velocity to 3.20 m/s in 11.0 s. I don't know this one the only thing I know is p=w/t

asked by Jon on April 4, 2008
24. ## chemistry

The volume of an ideal gas is 2.06L at standard temperature and pressure. Calculate the volume at 1.75atm and 27oC

asked by Lo on December 6, 2010
25. ## chemistry

Calculate the standard cell potential for the glavanic cell in which the follwoing reactino occurs: 2I^-(aq) + Br2(l) ---> I2(s) + 2Br^-(aq)

asked by Priya on April 22, 2008
26. ## Area and Perimeter Shepes

a rectangle has a perimeter of 32cm. one side measures 5cm. calculate the area of the rectangle.show your working.

asked by Willow on November 10, 2015
27. ## Chemistry

The distance between Miami and Key Largo is 70 miles. If a mile is 5280 ft and an inch is 2.54 cm, Calculate this distance in Kilometers

asked by Zee on January 20, 2013
28. ## math

If the wheel of a bicycle has a diameter of 60cm, calculate how far a cyclist will have travelled after the wheel has rotated 100 times.

asked by Samuel on January 15, 2015
29. ## Physics

A 225-kg crate is pushed horizontally with a force of 710 N. If the coefficient of friction is 0.20, calculate the acceleration of the crate.

asked by Nathan on April 14, 2010
30. ## chemistry

calculate the pH of a buffer made by combining 50.0mL of 1.00M ammonia and 50.0mL of ammonium nitrate Kb=1.77x10^-5

asked by Mandie on November 12, 2011
31. ## mathematics

The first and the last term of ap is 21 and-47 , if the sum of series is 234 calculate ,number of term ,common difference, thesum of first 18 terms

asked by ojo on October 23, 2018
32. ## mathematics

The first and the last term of ap is 21 and-47 ,if the sum of series is 234 calculate ,number of term ,common difference, thesum of first 18 terms

asked by ojo on October 23, 2018
33. ## Math

A cone is 14cm deep and the base radius is 4.5cm. Calculate the volume of the water that will fill the cone

asked by Kayode on March 30, 2016
34. ## science

a body travel a distance of 15m from a to b and them movrs 20 m at right angles to ab. calculate the total distance covered and displacement. (

asked by gunjan on June 26, 2014
35. ## math

The angle of elevation of the top of a building from a point 10m away in level ground is 30.calculate the height of the building

asked by Anonymous on January 5, 2017
36. ## Math

the speed of a point A due to the rotation of the earth is twice that point of B.if A is on latitud 22 degree to the north calculate the latitude of B

asked by flexy on October 24, 2012
37. ## Chemistry

Calculate the energy in joules and calories required to heat 40.0 silver from 112 degrees to 280 degrees

asked by Joan on June 14, 2010
38. ## Chemistry

Calculate the change in heat when 11.5 g of water vapor (steam) at 100.0°C condenses to liquid water and then cools to 5.00 °C

asked by Lisa on November 2, 2017
39. ## Physics

Two charges -1 microcoulumb and 2 microcoulumb are placed at the corner A and B of an equilateral triangle ABC of side 2m. Calculate the electric field at C

asked by Rajan on October 27, 2018
40. ## Math

A kitchen floor measures 10ft by 12 ft. Calculate the minimum area and maximum area using the greatest possible error

asked by Shelby on October 27, 2014
41. ## chemistry

Calculate the standard cell potentiqal for the galvanic cell in which the following reaction occurs: 2Na(s) + 2H20(l) --> H2(g) + 2NaOH(aq)

asked by Priya on April 22, 2008
42. ## chemistry

A given mass of gas has a volume of 7.5dm at 250k and 80kmm3,calculate the pressure at which it will have a volume of 7.2dm3 at 270k?

asked by Blessing on January 28, 2016
43. ## Finance

Present value, How do I calculate the present value of: 7,000.00 in 5 years at a quarterly discount rate of 6%? I have read over the material, but I don't get it. Thank you

asked by Nancy on April 22, 2011
44. ## Chemistry

Calculate ΔG∘ at 298 K for the following reactions. A) Ca(s)+CO2(g)+12O2(g)→CaCO3(s) B) 2KClO3(s)→2KCl(s)+3O2(g) C) CO(g)+H2O(g)→H2(g)+CO2(g)

asked by Tl on May 12, 2014
45. ## Chemistry

Calculate the percent yield for the reaction if 76.8 g of H2O reacted and 125 g of NO were produced. NO2+H2O->HNO3+NO

asked by Sara on July 20, 2013
46. ## Chemistry

A 249-gram sample of water is heated from 2° C to 85° C. Calculate the amount of heat absorbed (in kJ) by the water. Please explain.

asked by John on June 15, 2010
47. ## math

A chord of a circle 38.8 cm long is subtended by a 150 degree central angle.Calculate the radius of the circle.

asked by penelope on January 29, 2013
48. ## chemistry

Calculate the density of atoms in (001) in lithium (Li). Express your answer in units of atoms/cm2. incorrect

49. ## Physics

A bus accelerates uniformly from 8 M/s to 24 m/s in 4 seconds. What is the acceleration produced? Also calculate the distance covered by the bus during the given time?

asked by Vitthal on August 4, 2016
50. ## Physics

A car of mass m = 1450 kg is traveling at a speed of v0 = 79 km/h (21.9 m/s). Calculate the work that must be done by the brakes to completely stop the car in kJ

asked by Nate on May 27, 2012
51. ## Chemistry

2H2 (g) + O2 (g) 2H2O (g) what is the likely magnitude of the equilibrium constant? a) k < 10 ^-3 b) 10^-3

asked by Katie on March 11, 2010
52. ## math

a and b represent 2 walls. wall a costs \$180.00 to paint.at the same rate calculate the cost of painting wall b?

asked by kimberly on January 30, 2011
53. ## trigonometry

given triangle ABC with AB=7cm, BC=8cm and AC=9cm calculate 1. the size of the largest angle 2. the area of the triangle

asked by lindsay on April 21, 2012
54. ## Chemistry 3A

CS2 + O2 -> CO2 + SO2 and 10.0 grams of each reactant, calculate the number of moles of SO2 that can be produced in this reaction

asked by Gurjot on December 10, 2012
55. ## Chemistry

Calculate the new concentration of NaOH if 35 mL of 2.0M NaOH is added to 45 mL of water. If I don't use C1V1=C2V2, then how do I solve it? I'm confuused.

asked by Nissa on December 6, 2016
56. ## Chemistry

Calculate ΔG∘ at 298 K for the following reactions. Ca(s)+CO2(g)+12O2(g)→CaCO3(s) 2KClO3(s)→2KCl(s)+3O2(g) CO(g)+H2O(g)→H2(g)+CO2(g)

asked by John on May 18, 2014
57. ## Calculation in chemistry

8.0g of mettalicoxide were reduced by hydrogen to give a metal of 2.0g. Calculate the mole of d metal that will combined with 0.5moles of oxygen.

asked by Nurudeen on May 23, 2014
58. ## math

Calculate the interest earned on a savings account with \$900.00 that is invested at 4% annual simple interest for 5 years?

59. ## Chemistry

When K is measured for a reaction, the values obtained are 3.1 at 25°C and 7.42 at 35°C. Using the equation lnK=-(∆H°/R)(1/T)+(∆S°/R) (in the form y=mx+b) calculate ∆H° and ∆S° for the reaction PbCl2(s) --> Pb2+(aq) + Cl-(aq)

asked by sea lively on August 14, 2018
60. ## chemistry

Calculate the partial pressure of 3.25 moles of oxygen that have been mixed (no reaction) with 1.25 moles of nitrogen in a 25.0 L container of 298 K.

asked by alex on March 20, 2013
61. ## Chemistry

When K is measured for a reaction, the values obtained are 3.1 at 25°C and 7.42 at 35°C. Using the equation lnK=-(∆H°/R)(1/T)+(∆S°/R) (in the form y=mx+b) calculate ∆H° and ∆S° for the reaction PbCl2(s) --> Pb2+(aq) + Cl-(aq)

asked by sea lively on August 14, 2018
62. ## Algebra

Sam needs to fill up a box with packaging material. Use the Figures below to calculate the volume of the box. Length=2x+3 width=x+2 ht=x-3

asked by WillyB on March 12, 2014
63. ## Calculus

Calculate the Riemann sum of the area under the curve of f(x)=9-x^2 between x=-2 and x=3 The answer I come up with is 10/3, but when I solve using integrals, the answer I get is 100/3. Am I doing something wrong?

asked by Mike on December 3, 2017
64. ## chemistry

Calculate the partial pressure of 24 g methane, 48 g of oxygen and 56 g of nitrogen contained in a 25L container. What is the total pressure.

asked by josh on September 11, 2009
65. ## physics

In order for me to fill the table of equilibrium, how do I calculate change(mol) Please give me in detail about filling the table

asked by Lindokuhle on April 28, 2013
66. ## Mathematics

karen exchanged BDS\$ two thousand dollars and received EC\$ two thousand seven hundred calculate the value of one BD\$ in EC\$ I would just like the formula so i can work it out please

asked by INDIANA on June 26, 2012
67. ## Chemistry

Calculate the amount of heat in kcal it would take to convert 1.45 mol of ice at 0 degrees C to steam at 100 degrees C.

asked by Jess on November 1, 2011
68. ## Math

The 13th termof an arithmetic sequence is 61 and the 20th term of the squence is 82. Calculate the sum of the first 25 terms of the sequence

asked by Melissa on December 17, 2011
69. ## Physics

A constant force of 35.9 N, directed at 28.7o from horizontal, pulls a mass of 14.7 kg horizontally a distance of 3.41 m. Calculate the work done by the force.

asked by Kristen on October 20, 2013
70. ## math

A triangular plot ABC is such that AB = 36m, BC = 40m and AC = 42 m a) Calculate the: i) Area of the plot in square meters √(s(s-a)(s-b)(s-c)) How to find S?

asked by kudu on February 20, 2015
71. ## Physics

A constant force of 35.9 N, directed at 28.7o from horizontal, pulls a mass of 14.7 kg horizontally a distance of 3.41 m. Calculate the work done by the force.

asked by Kristen on October 20, 2013
72. ## Chemistry

The compound A1B2 (molar mass = 132) has a solubility of 13 g/L. Calculate the Ksp for this compound. I'm stuck on this question, please help?

73. ## chemistry

if 50.0 mLs of HCl of unknown concentration is titrated to neutrality with 90.0 mL of .650 M NaOH. calculate the molarity of the HCl

asked by susan on November 14, 2011
74. ## chemistry

How can values of heats of formation found in tables be used to calculate heats of reactions? I am having a really hard time understanding this.

asked by laura on October 2, 2016
75. ## Physics

a 254-kg crate is pushed horizontally with a force of 740 N. if the coefficient of friction is .20, calculate the acceleration of the crate

asked by Annie on November 29, 2012
76. ## Physical science

A brick falls off a scaffold at a height of 80meters above the ground. Calculate the magnitude of its velocity when it hits the ground.

asked by Lholo on January 21, 2019
77. ## chemistry

if 50.0 mLs of HCl of unknown concentration is titrated to neutrality with 90.0 mL of .650 M NaOH. calculate the molarity of the HCl

asked by susan on November 14, 2011
78. ## Physics

An isotropic point source has an intensity of 300Cd. Calculate the amount of luminous flux emitted by the source.

asked by Evans on August 16, 2018
79. ## physics

calculate the root mean square speed of nitrogen at 0 degree celcuis. Take the molecular weight of nitrogen M= 28*0.0010

asked by magayaki on August 9, 2016
80. ## chemistry

Calculate the mass of ethanol required to heat 200mL of water from 21 degrees celcius to 45 degress celcius

asked by Kate on November 9, 2010
81. ## MATH

Each year, Eric invests \$2500 at 8.2%/a compounded annually for 25 years. a) Calculate the value of each of the first four investments at the end of 25 years.

asked by Maame on May 26, 2012
82. ## physics

calculate the distance it traveled before it is brought to rest from 44 km/h if the speed of a truck going south is reduced from 80 km/h to 44 km/h in a distance of 250 m.

asked by Anonymous on December 16, 2011
83. ## Linear Programming

calculate the lower bound from min z= 4x1 + 2x2 2x1 - 3x2 => 4 x1 + 5x2 0

asked by Ashlee on October 30, 2006
84. ## physics

calculate the shortest length of cable which can be used to support a load of 1000N if tension in the cable is not to exceed 710N? Take AC=BC

asked by Ishank on October 16, 2011
85. ## math

what rule relating time and distance can help me calculate the traveled for 950 miles in bus at 60 miles per hour?

asked by monserrate on January 30, 2011
86. ## physics

calculate the distance it traveled before it is brought to rest from 44 km/h if the speed of a truck going south is reduced from 80 km/h to 44 km/h in a distance of 250 m.

asked by Annie on December 16, 2011
87. ## math/compound

Calculate the interest earned on an investment of 2500 invested at an interest rate of 6.15%/a compounded quarterly for 10 years.

asked by parker on January 3, 2015
88. ## Stats

The probabilty Distribution of a random variable X is given by the function f(x)= 1/84 (5/x) (4/3-x) for x= 0,1,2,3 Calculate the numerical probabilities and list the distribution. I got 10/21 for the x value of 2. The others I am unsure about! Help please

asked by Karmen on February 9, 2010
89. ## math

A goat is tied to a peg in the ground. the rope is 4.5m long. calculate the area of grass that the goat can eat.

asked by daniel paul on April 30, 2019
90. ## Chemistry

When K is measured for a reaction, the values obtained are 3.1 at 25°C and 7.42 at 35°C. Using the equation lnK=-(∆H°/R)(1/T)+(∆S°/R) (in the form y=mx+b) calculate ∆H° and ∆S° for the reaction PbCl2(s) --> Pb2+(aq) + Cl-(aq)

asked by sea lively on August 13, 2018
91. ## Integrated Math 1

Calculate the product of the binomials below. Use the caret ( ^ ) to enter any exponents; for example, write x2 as x^2. Write your answer in descending order. (4x - 3)(x + 1)

asked by Tifini on July 15, 2012
92. ## Math

Calculate the CPI for this year and for 5 years from now. Project the price 5 years from now of an item that you commonly buy like gas?

asked by Lisa on November 26, 2017
93. ## Chemistry

Calculate ΔG at 298K if MnO2 = 0.150 mol, Mn = 0.850 mol, CO = 0.250 M and CO2 = 0.500 M in a 1.25 L flask.

asked by Kate on April 8, 2015
94. ## Chemistry

Please help me....are these questions right or no? If not can you help me...any suggestions please? 7.(14). Which of the following is a salt? a. HNO3 b. H2SO4 c. CaSO4 d. NaOH e. NH3 I put down C- CaSO4, is that right or am I way off track? 8.(15). Which

asked by Taylor on October 6, 2009
95. ## Math

If a dice is 4mm per side then how do i calculate the surface area of the dice?

asked by Carol on August 19, 2018
96. ## geometry

In triangle ABC, AB=5 cm, BC=12 cm and angle ABC=90 degree, calculate the length of AC.

asked by Bhuvanesh. D on September 28, 2014
97. ## Chemistry

The Ksp of CaSO4 is 4.93× 10–5. Calculate the solubility (in g/L) of CaSO4(s) in 0.300 M Na2SO4(aq) at 25 °C

asked by Katherine on November 12, 2013
98. ## Physics- formula help

How do you calculate air resistance on an object if you have how much the object weighs and the acceleration?

asked by Mimi on December 1, 2014
99. ## Maths

Y varies partly as X and partly as the square root of inverse of X. If Y=11 where X=9 and Y=20 where X=9 calculate Y when X=12.

asked by Doris on April 14, 2018
100. ## physics

Calculate the component of a force of 200N at a direction of 60degre to the force

asked by abiy on October 26, 2016