# 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 207
1. ## Chemistry

Given the following thermochemical equation, calculate the heat (in kJ) involved in decomposing 18.0 g of water to give one mole of H2 (g).

asked by Zandria on June 14, 2009
2. ## Physics

Calculate how much energy is stored in a 17μF capacitor when it is charged to a potential difference of 200 V

asked by sam on April 24, 2018
3. ## Science

An athlete runs on a circular track 7m.calculate the distance and displacement covered by him after 3 rotations?

asked by Jhon on September 12, 2016
4. ## science

a body of mass 10kg is moved in a vertical circle calculate tangential acceleration

asked by annie on November 11, 2016
5. ## chemistry

Calculate the percent error when a student measured a sample of aluminum and obtained a density of 2.5g/mL.

asked by jonas on September 5, 2012
6. ## Chemistry

Calculate [H3O+] in the following solutions. 1) 0.100 M NaNO2 and 5.00×10−2 M HNO2 2) 5.20×10−2 M HCl and 7.62×10−2 M NaC2H3O2 please help thx

asked by Lol on March 29, 2018
7. ## chemistry

Calculate the percent error when a student measured a sample of aluminum and obtained a density of 2.5g/mL.

asked by Kyle Jackson on September 5, 2012
8. ## calculus

Calculate the equation of the tangent and normal lines for the curve f(x) = tan 2x, at the point where the x-coordinate is: x = π/8.

asked by Bonaventutre on March 27, 2013
9. ## Chemistry

how do I find the density of CO2, I am not allowed to look it up and all I have is H202 and ethanol. I don't think I have to use both, but I can't figure out how to calculate it.

asked by Anonymous on February 6, 2009
10. ## science

if the velocity of a progressive wave with a periodic frequency of 10khz is 330m/s.calculate it's wavelength.

asked by versatile on July 14, 2016
11. ## Chemistry

Calculate the mass of a mole of glucose, C6H12O6, in grams. Would I just find the GFM, which comes out to 180.0g?

asked by Anonymous on October 12, 2009
12. ## Chemistry

calculate the volume needed to make 2.20 x 10^2 ml of 0.100M cacl2. what would be the total concentration of the final (Cl-) alone?

asked by Lyn on November 30, 2016
13. ## Physics

Calculate the skid-to-stop of a car travelling oa a road at 100km/h with a coefficient of friction of 0.68.

asked by skid on September 8, 2016
14. ## physics

11. The horizontal range of a projectile is 4 3 times of its maximum height. Calculate the angle of projection.

asked by chimatiro on March 27, 2019
15. ## Chemistry

Calculate the number fo moles of NaOH(aq) needed to react completely with 125 mL fo 6.00 M H2SO4(aq)

asked by Sam on October 20, 2012
16. ## chemistry

calculate how much strontium fluoride will dissolve in 1L of water given Ksp= 2.5x10^-9 at 25 degree celsius

asked by lily on June 3, 2012
17. ## physics

Calculate the speed of sound wave in air if its frequencies and wavelengths are 256Hz and 1.32m

asked by Melissa on June 3, 2012
18. ## Physics

Two charges each of 40 microcoulomb are placed at a distance of 0.4 M. calculate the potential at the midpoint. Dielectric constant of the medium is 2.

asked by Prapti on May 4, 2018
19. ## 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
20. ## math

A circular pie was cut into 6 equal slices. Calculate the angle formed by each slice.

asked by indira on February 28, 2017
21. ## statistics

Calculate the probability of meeting a scheduled time of 50 units for the PERT network shown below:

asked by ELlis on November 15, 2012
22. ## Science

Calculate the amount of water produced by the combustion of 44g of propane and 16g of methane.

23. ## Science

Calculate the linear momentum of a pickup truck that has a mass of 1100 kg and is traveling eastward at 22 m/s.

asked by Audible on June 13, 2013
24. ## science

calculate the time taken by a train to travel 1000m if its initial speed is 30m/s and it has an acceralation of 0.1m/s

asked by daniel on April 16, 2013
25. ## Chemisty

Calculate the standard enthalpy change for the following reaction at 25 °C. MgCl2(s)+H2O(l)-->MgO(s)+2HCl

asked by Orton on April 1, 2013
26. ## Science

Bullet of mass 30g travels at a speed of 1500m/s,calculate its kinetic energy.

asked by Abdul Qudoos on September 24, 2017
27. ## physics

a body is moving with uniform acceleration of 10m/s2.if it starts from rest calculate its displacement after 5s

asked by Anonymous on May 21, 2013
28. ## physics

Calculate the internal energy of 25.0 g of low-density oxygen gas (O2) at a temperature of 255 K.

asked by JOHN on April 13, 2012
29. ## Financing

(a) How do you calculate manufacturing overhead costs to the two products using activity based costing (ABC).

asked by Fred on June 28, 2009
30. ## physics

a body is moving with uniform acceleration of 10m/s2.if it starts from rest calculate its displacement after 5s

asked by Anonymous on May 21, 2013
31. ## science

if the velocity of a progressive wave with a periodic frequency of 10KHz is 330m/s. calculate it's wavelength.

asked by iornav Gideon on July 10, 2016
32. ## chemistry

Calculate the increase of entropy in J/K when 8.6 mole of C 2 H 5 OH melts at (-114) o C and 1 atm. ΔH fus = 5.02 kJ/mol

asked by carl on March 31, 2013
33. ## math

the side of a tetrahedron .if the base of each triangle is 8 cm and the height 6.9cm,calculate the surface area

asked by Anonymous on June 10, 2013
34. ## Science

Calculate the wavelength, λ, in meters of a photon capable of exciting an electron in He+ from the ground state to n = 4.

asked by Anonymous on March 2, 2013
35. ## Mathematics

Calculate the length of time for \$400 to earn \$160 if invested at 8% per annum, thank you in advance.

asked by Eye Clinic on February 25, 2019
36. ## Chemistry

In procent how much etanol with 10% metanol in water to mix because i must calculate to have liquid freeze to -20C?

asked by Mia on October 17, 2012
37. ## Chemistry

Solve an equilibrium problem (using an ICE table) to calculate the of each of the following solutions. .16M CH3NH3Cl

asked by Dillon on March 30, 2013
38. ## Chemistry

Calculate the volume of carbon 4 oxide gas at s.t.p when 5g of zinc trioxocarbonate is heated strongly.

asked by Emmanuel on October 15, 2018
39. ## science

Calculate the fraction of atoms in a sample of argon gas at 365 K that has an energy of 11.0 kJ or greater.

asked by Hannah on February 9, 2013
40. ## physics

A force of 291.0 N is used to push a 140 kg mass 30.0 m horizontally in 3.00 s. Calculate the power developed in kW.

asked by Mara on December 14, 2008
41. ## Science

Calculate the time needed for a net force of 5N to change the velocity of a 10kg mass by 2m

asked by Navya on February 23, 2017
42. ## Science

Calculate the gram molecular mass of nitrogen if 360cc at STP weigh 0.45g.

asked by Chemistry on November 24, 2016
43. ## 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
44. ## stats

n a study using 15 respondents and in which the population variance is unknown, what distribution should be used to calculate the confidence interval.

asked by Anonymous on September 2, 2012
45. ## chem

Given the following wavelength of light, calculate the energy of one photon in Joules. λ = 1 x 10^0 meters what does it mean? i don't know what to do or how to solve

asked by will.i.am on February 11, 2013
46. ## maths

Two vectors P and Q of magnitudes 5 and 3 units respectively are inclined at an angle of 30 to each other.calculate the component of the resultant in the direction of Q.

asked by joe on November 15, 2016
47. ## Physics

Calculate the length of a displaced pendulum Bob which pass through its lowest point twice every second. Take g=10m/s²

asked by Majiri on September 16, 2017
48. ## PHYSICS

AN OBJECT MASS OF 10KG IS PLACED ON AN INCLINED PLANE AT 30 degree at the horizontal calculate recreation between two su

asked by MUTIAT on September 23, 2017
49. ## math

Please help me. Thank you! I need help freshing my memory. How do you calculate the slope of a horizontal and a verticle line? I remember how to do a diagonal but that's it. Please and thank you.

asked by Amy on January 14, 2009
50. ## Science

An electron in Li2+ falls from n = 2 to the ground state. Calculate the wavenumber, (νˉ), of the emitted photon.

asked by Anonymous on March 2, 2013
51. ## physics

Calculate the velocity time graph of a body at rest is given an initial uniform acceleration .

asked by 7up on October 20, 2016
52. ## Chemistry

50.0 mL of 0.116 M NaOH is titrated with 0.0750 M HCl. Calculate the pH after the addition of 5.0 mL volume of acid.

asked by Nathan on May 1, 2013
53. ## Chemistry

After 0.69 g of CoCl2⋅6H2O is heated, the residue has a mass of 0.333 g . Calculate the % H2O in the hydrate.

asked by cant tell ya on April 10, 2019
54. ## cHEMISTRY

CALCULATE THE HEAT ENERGY JUST AFTER MIXING AS (mCpT) for the total mass of water, using Cp=4.184J/g-c

asked by Anonymous on April 18, 2012
55. ## physics

An object is projected at an angle of elevation of 45 degree with a velocity of 100 m/s calculate its range

asked by tsering on January 29, 2017
56. ## chemistry

calculate the volume of oxygen required for cmmplete combution of20cm3 of (C2H2) ethyne

asked by suleiman on January 13, 2019
57. ## chemistry

Calculate the wavelength, λ, in meters of a photon capable of exciting an electron in from the ground state to n = 4.

58. ## Chemistry

Calculate the enthalpy change for the melting of a 30 g ice cube. Show all your steps. Any help is appreciated! :)

asked by anonymous on November 10, 2008
59. ## chemistry

Calculate the molar mass of a gas if 4.40g occupies at 3.50 L at 560mmHg and 41 degrees celsisus

asked by to on March 21, 2017
60. ## AP Chem

Calculate the pH and % ionization for each of the following acids.a. 0.15 M HNO3b. 0.10 M HCNc. 0.40 M HFd. 0.10 M HClO2 I have no idea how to do this? In clas we had a Ka but none was given here... Please Help! Thank You

asked by Kelly on February 4, 2018
61. ## Chemistry

Calculate the number of moles in this quantity: 250 ml ethyl alcohol,C2H5OH(=0.789 g/ml)

asked by Anonymous on December 14, 2012
62. ## physics

Calculate the electrical attraction that a proton in a nucleus exerts on an orbiting electron if the two particles are 1.13×10^-10 m apart.

asked by Erin on September 5, 2008
63. ## Hess's law

I need some help with this one please... A+B ----> 2 D H= -765.3 kj S= 344 j/k C ------> D H= 521 kj S= -171 j/k calculate G at 298 K for A+B ------> 2C I know I need to use the formula G= H-TS but I don't know how to get the numbers.

asked by Caitlin on March 20, 2013
64. ## Chemistry

Portland cement contains some SiO2. Calculate the mass percent composition of silicon in this compound.

asked by Jenny on October 4, 2012
65. ## Chemistry

After 0.69 g of CoCl2⋅6H2O is heated, the residue has a mass of 0.333 g . Calculate the % H2O in the hydrate.

asked by just need help on April 10, 2019
66. ## algebra 1

if you go from one point to the other do you subract the a and b or do you do all points in between to find the elevation? I'm not sure what this question refers to. Are you trying to calculate slopes?

asked by jamie on September 5, 2006
67. ## science

calculate the cost of using a 100w lamp for 10 hours if electrical energy costs 11.3 per kwh

asked by georgie on September 11, 2009
68. ## phy

Calculate the average translational kinetic energy of a nitrogen molecule at 27 degree celcius

asked by christ on January 24, 2013
69. ## chemistry

Calculate the number of grams of acetic acid present in the mixture after the reaction is complete.

asked by Anonymous on January 29, 2013
70. ## Physics

Calculate the change in kinetic energy of a 2.50kg cat slowing down from 1.00m/s to 0.500m/s.

asked by help on October 22, 2018
71. ## maths

calculate differentiation of cos x to x using first principle of derivative. Find the value of differentiated function , if x = 270°

asked by rajkaur on January 12, 2019
72. ## Math

A map is drawn to a scale 0f 1 :20 000. Calculate the area of a a lake that measures 3 square km

asked by Erica on January 27, 2017
73. ## Physics

Calculate the kinetic energy of an elephant (mass = 5 tonnes) charging at a speed of 36km/h.

asked by help on October 22, 2018
74. ## Chemistry

calculate the mass of chlorine gas contained in 5.00dm³ flask at 25°C and 98 kpa pressure?

asked by Jessica on April 10, 2019
75. ## chemistry

Calculate the mass of oxalic acid needed to prepare 150 ml of 0.442 M C2H2O4.

asked by Anonymous on October 25, 2016
76. ## science

Calculate the number of ions present in 7.45 grams of potassium oxide. ( At.mass of K= 39u).

asked by elby on July 3, 2017
77. ## CHEMISTRY

(c) Calculate the degree of polymerization n of polystyrene with a molecular weight of 3.091×106 g/mol.

asked by lena on January 5, 2013
78. ## Accounting

I need to make a Bond with discount and I do not know how to and where to find the instructions to do so. The part that I'm having the most trouble with is the interest, how to calculate it? HELP!

asked by Lizmarie on September 15, 2006
79. ## Phy113

Calculate the average traslation kinetic energy of a nitrogen molecule at 27 degree celcius

asked by Ugonnia on February 14, 2013
80. ## Physics

the speed of a train increases from 15 mi/h in a distance of 500 ft. calculate the average acceleration in ft/s squared

asked by Amel on March 12, 2017
81. ## Finance

I did to get better clarification on how need to find the degree of operating leverage and how to calculate this, based on the information that I have - please help. I am not getting this piece..ty

asked by maryk on October 16, 2009
82. ## math

Jeff takes a loan of R25000 in a period of 5years calculate the interest rate?

asked by Daniel on April 26, 2013
83. ## Chemistry

The solubility product for Ni(OH)2(s) is 1.6 ✕ 10−16. Calculate the value of ℰ° for the following half-reaction. Ni(OH)2 + 2 e− → Ni + 2 OH − I have no idea what equation to use or how to solve this problem

asked by Elizabeth on May 11, 2018
84. ## chemistry

Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n=5 to n=1 in J.

asked by ariel on February 6, 2017
85. ## science

calculate the change in entropy when 1.00g of oxygen at 27 degree celsius is expanded from 1 dm 3 to 4 dm3

asked by Anonymous on February 27, 2013
86. ## physics

An object is projected at an angle of elevation of 45 degree with a velocity of 100m/s. Calculate it's range

asked by anees on November 30, 2016
87. ## Chemistry

Calculate the new volume of 23.5 mL of N2 gas initially at 220k Pa and 98.7 degrees Celsius when converted to STP

asked by Anonymous on March 4, 2017
88. ## college math

Calculate the area of a circular patio that has a radius r = 3yd. Use 3.314 The formula be A = (3.14) x 3 x 3 the answer 28.26

asked by Lourane on June 1, 2012
89. ## science

The rate constant of a certain reaction is given by log K= 212/T Calculate the activation energy at 400K.

90. ## Science

Calculate average velocity of a minute hand of 5cm long from between 6am to 6:30am

asked by Dinesh on June 18, 2016
91. ## math

calculate the average percent 1970 1980 1990 2000 17.2 17.3 17.1 16.6 do you add them all together then divide by 4

asked by deb on April 30, 2012
92. ## Chemistry Science

. When a 28.7 g sample of KI dissolves in 60.0 g of water in a calorimeter, the temperature drops from 27.2oC to 13.2 oC . Calculate ΔH for the process.

asked by science girl on May 29, 2012
93. ## Physics

Calculate the work done by a 300N Force moving a 20kg object a distance of 50m

asked by Danielle on September 4, 2016
94. ## Calc.

For the function ƒ(x) = x^3 - 8x + 3, calculate where a = 5 and h = 2. Simplify before substitution (the simplifying is where I am having problems...not sure if my answer is right). Thanks. Using the limits equation.

asked by Derek on July 14, 2008
95. ## 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
96. ## Science

An arrow is shot vertically upwards with an initial velocity of 14 m/s . Calculate the height reached

97. ## physics

calculate the friction force of an object? if weight=19600,vi=30ms-1,vf=0ms-1 and S=100m.

asked by sana on January 7, 2013
98. ## science

A body is dropped the roof of a building 10 mtr high calculate the time and speed g =10 m/s

asked by Paul on August 1, 2017
99. ## Physical Sciences

How do I calculate the initial velocity of a ball if i've only given a maximum height of 12metres above its starting point?

asked by Amanda on January 25, 2013
100. ## college chem

calculate the amount of heat (in kj) required to convert 140.1 g of water to steam at 100c

asked by luis fernandez on February 4, 2013