# 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 293
1. ## chemistry

Aluminum reacts with sulfuric acid, which is the acid in automobile batteries. If 20.0 grams of Al is placed into a solution containing 115 grams of H2SO4, how many grams of hydrogen gas could be produced? Please help--I do not know how to set this one up.

asked by lucy on October 20, 2007
2. ## chemistry

Three solutions are mixed together to form a single solution. One contains 0.2 mol \rm mol Pb(CH 3 COO) 2 \rm Pb(CH_3COO)_2, the second contains 0.1 mol \rm mol Na 2 S \rm Na_2S, and the third contains 0.1 mol \rm mol CaCl 2 \rm CaCl_2. Write the

asked by cc on October 19, 2013
3. ## Chemistry

What is the silver ion concentration in a solution prepared by mixing 487 mL of 0.384 M silver nitrate with 379 mL of 0.583 M sodium phosphate? The Ksp of silver phosphate is 2.8 × 10-18

asked by Gabby on January 19, 2013
4. ## Chemistry

What is the silver ion concentration in a solution prepared by mixing 345 mL of 0.352 M silver nitrate with 443 mL of 0.511 M sodium carbonate? The Ksp of silver carbonate is 8.1 × 10-12

asked by CP on March 11, 2013
5. ## Chemistry

A student walks at a brisk 3.50 mi/hr. Calculate the student's speed in yards/minute. I have 4 questions just like this one. Could you tell me step by step on how to do the double conversions? Thanks!

asked by Cheyenne on March 11, 2014
6. ## chemistry

mass of empty flask plus stopper 36.765 g mass of stoppered flask plus water 65.264 g Temperature 24.8 C calculate the volume? need help please

asked by finny on September 6, 2016
7. ## science

A man has a mass of 80.0kg is standing on the surface of the earth.(a)calculate the magnitude of the attractive force that the earth exerts on the man

asked by lebo on February 21, 2013
8. ## Chem

Water was decomposed by the following reactions. Calculate the mass of HCl produced from 50.0 mL water assuming the following yields H2O=H2+O2 90% H2+Cl2=HCl

asked by Anonymous on February 12, 2017
9. ## Chemistry

Calculate the diffusion rate of deuterated methane through a set of barriers if fluorine will diffuse through the same barriers at a rate of 35.8 moles/sec

asked by Anonymous on May 22, 2010
10. ## Chemistry

A student walks at a brisk 3.50 mi/hr. Calculate the student's speed in yards/minute. I have 4 questions just like this one. Could you tell me step by step on how to do the double conversions? Thanks!

asked by Cheyenne on March 11, 2014
11. ## chemistry

The Henry’s Law constant for N2 in water at 30 oC is 6.0 x 10-4 M/atm, calculate the solubility of nitrogen gas in water at a partial pressure of 2.5 atm

asked by S on February 5, 2015
12. ## Chemistry

When 1.11 g of vanadium is dissolved in HCl, 0.066 g of H2 is produced. Calculate the value of x for the compound VClx produced according to the chemical equation: V = xHCl -> VClx + 0.5x H2

asked by Doris on October 13, 2010
13. ## math

a square based brass plate is 2mm high and has a mass of 1.05 the density of the brass is 8.4g/cubic cm.calculate the length of the plate in cm

asked by david on November 28, 2018
14. ## PHYSICS

A crate is pushed horizontally with a force. The acceleration of gravity is 9.8 m/s2 . Calculate the acceleration of the crate. Answer in units of m/s2 1570 N 198 kg μ = 0.44

asked by RACHEL on December 18, 2013
15. ## chem

While the pressure of 1.40L of gas is kept constant, its temperature is increased from 27 degrees Celcius to 177 degrees Celcius, How do I calculate the new volume?

asked by gina on October 14, 2014
16. ## Mathematics

a cylindrical water tank has a height of 20cm and a radius of 14cm.if it is filled to 2\5 of its capacity. calculate the quantity of water in the tank.

asked by Kenneth on November 26, 2017

Jenny is paid a monthly salary of $1600. She saves 1/5 of her salary each month A) Calculate her saving each month. B) How much will she save in a year? asked by Anonymous on February 25, 2013 18. ## Physics A pulley system lifts a 500-lb block 1.0 foot with an effort of only 50 lb. If the 50 lb moves 30 feet, calculate the efficiency of the pulley system. asked by Isis on June 18, 2013 19. ## math point A(-1,-2) B(7,2) C(k,4) K is a constant. The vertices of ABC. Angle ABC is a right angle. Ive worked out the gradient of AB to be 1/2. And the negative reciprocals is -2. How do you calculate the value of k?? thanks for the help asked by liam on October 13, 2010 20. ## physics A bucket of water with a mass of 20.0 kg is being pulled up from a well with a single massless rope. If the tension in the rope is 200 N, calculate the acceleration of the bucket. asked by lol on August 11, 2015 21. ## Maths Calculate the total amount (loan and interest)to be paid on a loan of N1 000.00, borrowed for 2 years at a simple interest rate of 10% p.a. asked by Funbi on November 23, 2016 22. ## chemistry At a particular temperature, K = 3.75 for the following reaction. SO2(g) + NO2(g)= SO3(g) + NO(g) If all four gases had initial concentrations of 0.840 M, calculate the equilibrium concentrations of the gases. asked by Enrique on January 15, 2009 23. ## physics Blood takes about 1.50 s to pass through a 2.0-mm-long capillary. If the radius of the capillary is 5.00 um and the pressure drop is 2.60 kPa, calculate the viscosity of blood asked by Alex on April 9, 2013 24. ## math point A(-1,-2) B(7,2) C(k,4) K is a constant. The vertices of ABC. Angle ABC is a right angle. Ive worked out the gradient of AB to be 1/2. And the negative reciprocals is 2. How do you calculate the value of k?? thanks for the help asked by liam on October 13, 2010 25. ## Chemistry Calculate the amount of heat (in kJ) required to convert 87.5 g of water to steam at 100°C. (The molar heat of vaporizaion of water is 40.79 kJ/mol.) asked by MC on December 1, 2010 26. ## math a ladder 2.5m long rests on a vertical wall at a height 1.5m above the level ground. calculate the distance of the wall from the foot of the ladder asked by Bolu on August 18, 2016 27. ## Engineering Science N4 An aircraft is at A and has to drop a bomb on target B. If the aircraft flies at 720km/h at a height of 2km, calculate how ahead from B the bomb will to be dropped. asked by EmpressPamela on February 7, 2015 28. ## Trigonometry A boat is 100 m from the bottom of a 75 m high cliff. Calculate the angle of elevation from the boat to the top of the cliff. (I've been trying to solve it but i have no idea how asked by Unknown on September 19, 2016 29. ## chemistry Consider the following reaction in the solvent CCl4 in a 1-L flask: 2IBr(g)Br2(g)+I2(g) What is the equilibrium moles of IBr, Br2 and I2 are 0.2, 0.1 and 0.1, calculate the equilibrium constant Kc. asked by Tong on December 6, 2017 30. ## finance Based on the following information, calculate the required return based on the CAPM: Risk Free Rate = 3.5% Market Return =10% Beta = 1.08 asked by jose on July 7, 2013 31. ## Physics 1.A light ray enters from air (n1 = 1.0) onto glass (n2 = 1.5). Calculate Θ2 (transmission angle) values for Θ1 (incident angle) values 10, 20, 30, 40, 50, 60, 70, 80 degrees, respectively. asked by Jeff Helper on February 1, 2009 32. ## Physics For a certain transverse wave, the distance between two successive crests is 3.11 m, and 5 crests pass a given point along the direction of travel every 12.16 s. Calculate the wave speed. asked by Brian on November 21, 2010 33. ## Chemistry #27 Given that: H2 (g) + F2 (g) ---> 2HF (g) H(rxn)= -546.6 kJ 2H2 (g) + O2 (g) ---> 2H2O (l) H (rxn)= -571.6 kJ calculate the value for H(run) for... 2F2(g) + 2H2O (l) ---> 4HF (g) + O2 (g) _____kJ? asked by Chelsea on October 28, 2013 34. ## Chemistry AP Calculate the concentration of H3O + present in 0.377 M H2CO3. Answer in units of mol/L I know the Ka of H2CO3 is 4.3E-7. But I don't know what to do from there. (Or, I'm not getting the correct answer at least) asked by Ethan on February 9, 2015 35. ## human services management does anyone know how to calculate fixed costs, variable costs and break even points on balance sheets, cash statements and income statements? asked by Mikaila on January 24, 2009 36. ## Chemistry At a particular temperature, K = 3.75 for the following reaction. SO2(g) + NO2(g) SO3(g) + NO(g) If all four gases had initial concentrations of 0.520 M, calculate the equilibrium concentrations of the gases asked by Erin on May 5, 2010 37. ## chemistry The mole fraction of nitrogen in air is 0.7808. calculate the partial pressure of N2 in air when the atmospheric pressure is 760 torr? asked by NONO on November 18, 2011 38. ## physics A metal sphere is launched with an initial velocity of 1.5 m/s as it leaves the ramp. The end of the ramp is 1.2 m above the floor. Calculate the range of the sphere. asked by Christian on October 13, 2014 39. ## Physics For a certain transverse wave, the distance between two successive crests is 1.89 m, and 5 crests pass a given point along the direction of travel every 12.84 s. Calculate the wave speed. asked by Pete on November 22, 2010 40. ## financial maths A loan is repaid at the rate of$200 per week for 15 years. if the interest rate is 6.65% per annum.Calculate the the total amount repaid

asked by Louisa on February 27, 2016
41. ## chemistry

When 1662 J of heat energy is added to 45.9 g of hexane, C6H14, the temperature increases by 16.0 °C. Calculate the molar heat capacity of C6H14.

asked by ashley on October 20, 2012
42. ## chemistry

Helpful steps? Calculate the predicted atomic radius for potassium, K, given the atomic radius of rubidium, Rb, (0.247 nm) and cesium, Cs, (0.265 nm).

asked by Ally on April 23, 2014
43. ## Physics

A machine has an overcome of 60percent.If the machine is required to overcome a load of 30N with a force 20N.calculate it velocity ratio?

asked by Dalong on March 2, 2016
44. ## physics

A 1 tonne caravan is being towed by a car which provides a constant drawbar pull of 40 N. If the resistance to motion is 20 N, calculate the acceleration of the car and the caravan.

asked by baz on March 21, 2015
45. ## Statistics

If the mean family size is 4.75 what is the total population of a city of 25000 families? Is it correct if I calculate it as follows: Mean: (x : 25000) = 4.75 Mean: x = 118750 number of population

asked by Pavlos Cs on April 9, 2011
46. ## Chemistry

Given: Cu2O(s) + 1/2 O2(g) → 2CuO(s) deltaH°= -144 kJ 2Cu2O(s) → 2Cu(s) + 2CuO(s) deltaH°= 22 kJ Calculate the standard enthalpy of formation of CuO(s).

asked by Anonymous on September 21, 2014
47. ## college

A firm has a debt to asset ratio of 75%, $240,000 in debt, and net income of$48,000. Calculate return on equity.

asked by Syndi on October 31, 2010
48. ## physics

Two forces of resultant 100N are prependicular to each other. If one of them makes angle 60degree with the resultant, calculate the magnitude of the forces. (Sin60degree=0.87, cos60degree=0.5)

asked by damola on October 10, 2014
49. ## Physics

A object is placed before a converging lens. calculate the image formed if the lens as focal length of 15cm also determine the magnification of the length.

asked by Pauline on April 9, 2018
50. ## Chemistry

Consider the Li2+ ion. (a) Calculate the wavelength of light emitted when the electron jumps from the n=4 level to the n=2 level. (b) What is the ionization energy of Li2+ ?

asked by Mahnoor on November 19, 2014
51. ## Statistics/Probability

An observer has measured the starting position of a toy vehicle as xs = 9.3 ± 0.2 m and the finishing position as xf = 14.4 ± 0.3 m. Calculate the displacement and the error in the displacement. I am not sure where to start at all.

asked by Erica on October 10, 2016
52. ## Chemistry

Calculate the average kinetic energy of 1 mol of hydrogen molecules and of 1 mol of sulfur hexafluoride molecules at 25 degrees Celsius.

asked by Lana on January 18, 2016
53. ## Chemistry

Calculate the average kinetic energy of 1 mol of hydrogen molecules and of 1 mol of sulfur hexafluoride molecules at 25 degrees Celsius.

asked by Sanaya on January 18, 2016
54. ## Chemistry 2

The rate constant nearly doubles for some reaction when there is an increase in temperaure from 17 degree celsius to 32 degree celsius. Calculate the activation energy.

asked by Tim on July 11, 2010
55. ## Statistics

IF SAT scores have approximately a normal distribution with the mean being 550 and standard deviation of 90. How can I calculate the SAT scores of the 95th percentile? Thank you

asked by Kerry on April 17, 2017
56. ## PHYSICS

A 70 KG man is standing on a scale inside an elevator. Calculate the reading on a scale after the cable breaks and the elevator goes into free fall.

asked by Cassy on August 18, 2010
57. ## Maths

a hosepipe feeds water into a tank of height 2m and an internal diameter of 1.6m. Calculate the volume of water in the tank when it is full. Please help as I'm very confused :)

asked by Stoof on April 10, 2016
58. ## chemistry

When 1367 J of heat energy is added to 44.1 g of hexane, C6H14, the temperature increases by 13.7 °C. Calculate the molar heat capacity of C6H14.

asked by anon on October 28, 2016
59. ## chemistry

Calculate the amount of heat required to heat a 3.5 kg gold bar from 21 degrees C to 37 degrees C. What would be the best way to work this problem? I don't know if I need to convert the kg to g.

asked by Raene on September 3, 2018
60. ## physics

a motor pumps water from a depth 0f 6meters. f it pumps 100kg of water in one minute with a velocity of 10m/s. calculate the work done

asked by afsal on December 25, 2011
61. ## physics

A 72.5 kg skier is going straight down a 31.1o slope. Each ski has a contact area with the snow of 0.137 m2. Calculate the pressure that the snow exerts on each ski.

asked by becca on November 12, 2013
62. ## chemistry

Calculate the amount of heat required to heat a 3.5 kg gold bar from 21 degrees C to 37 degrees C. What would be the best way to work this problem? I don't know if I need to convert the kg to g.

asked by Raene on September 3, 2018
63. ## chemistry

When 1367 J of heat energy is added to 44.1 g of hexane, C6H14, the temperature increases by 13.7 °C. Calculate the molar heat capacity of C6H14.

asked by sam on October 27, 2016
64. ## Chemistry

A reaction has a standard free-energy change of –12.40 kJ mol–1 (–2.964 kcal mol–1). Calculate the equilibrium constant for the reaction at 25 °C.

asked by Breauna on September 8, 2014
65. ## physics

The aircraft has a take-off mass of 320 000 kg. Each of the 4 engines can produce a maximum force of 240 kN. calculate the maximum acceleration of the aircraft.

asked by unknown on October 12, 2012
66. ## Chemistry

In this experiment the only source of Ca2+ ions is Ca(OH)2. Using the experimental Ksp value, calculate the slubility of Ca(OH)2 (in mol/L) in .30 M NaOH. Experiment Ksp = 1.69x10^-5

asked by Jose on April 24, 2011
67. ## chemistry

Calculate DHo for the oxidation of nitric oxide to nitrogen dioxide, 2 NO(g) + O2(g) --> 2 NO2(g), from the following data: DHof[NO(g)] = +90.25 kJ DHof[NO2(g)] = +33.18 kJ im confused...can someone help me.

asked by leanne on November 19, 2009
68. ## physics

A block of 25 is pulled horizontally on a rough surface by the force 120N.the coefficient of friction between the surface is 0.34 how do i calculate the accelation of the block

asked by kem on June 2, 2015
69. ## Optoelectronics

Obtain an expression for the radiative lifetime in terms of the transition oscillator strength. Calculate the lifetime for a transition with wavelength 500 nm and f = 0.5

asked by Physicst on January 7, 2012
70. ## Chemistry

If I titrate a sample containing Ammonium Sulphide with a 0.05m Cadmium chloride until an end point is reached, how do I calculate the % sulphide in the sample

asked by David on February 8, 2013
71. ## chem

Fe3O4(s) + C(s) > CO2 + Fe Balance the chemical reaction and calculate how many moles of Fe3O4 must be reacted to produce 440 gr CO2 (the > is an arrow)

asked by Karen on November 2, 2015
72. ## physics

a person completes 5 rounds of a field. if radius of the field is 70m , calculate the distance and the displacement covered by the person during his trip .

asked by anshita on June 3, 2012
73. ## calculus

How to calculate the volume of rotating object formed by the area between curve y=x^2 and y=3x which is rotating through : a. x axis b. y axis ; using skin tube methode

asked by bruge on February 6, 2016
74. ## physics

A cat moving in a desert walks 15m due north, then 6m due east then south calculate the resultant of the cat.

asked by proflabo on March 17, 2015
75. ## physics

The ice point of an ungraduated mercury in glass thermometer is x while it stem point is 90°This thermometer read 60°when the true tempetature is 40°c calculate the value of x?

asked by poppy on April 22, 2019
76. ## chemistry

When 1219 J of heat energy is added to 40.4 g of ethanol, C2H6O, the temperature increases by 12.3 °C. Calculate the molar heat capacity of C2H6O. (In J)

asked by Anonymous on March 27, 2013
77. ## Math!!

Find the lateral area for the square pyramid. Height: 22 Base: 8 Side: 8 I know the answer, I just want someone to show me how to actually calculate it to find the answer. Thanks :)

asked by Val on May 12, 2016
78. ## chemistry

average atomic mass of magnesium is 24.31 amu. this magnesium is composed of 79 mole % of ^24 Mg and remaining 21mole % of ^25 Mg. calculate mole % of ^26Mg.

asked by shish on June 17, 2014
79. ## Chemistry

Calculate the time in which the activity of an element is reduced to 90% of its original value. The half-life period of the element is 1.4*10^10 years . Answer :- 2.13*10^9 years

asked by Harsh on November 20, 2014
80. ## physics

a copper wire has a diameter of o.5mm and resistivity of 1.6*10power 6 ohm cm.calculate the length of wire which will be necessary to make 10 ohm coil

asked by kanika on June 16, 2014
81. ## CHEMISTRY

14. Calculate ƒ´S0 for the formation of 1 mol of HI(g) from its elements given the following information: S0[H2(g)] = 131 J/mol∙K S0[I2(s)] = 116 J/mol∙K S0[HI(g)] = 206 J/mol∙K. A) 82 J/K B) 165 J/K C) 247 J/K D) 329 J/K

asked by MONICA on August 1, 2012
82. ## chemistry

17. Calculate H for the following reaction using Hess law H2 (g) + Br2 (g) → 2 HBr (g) Experimental information 2 H+ → H2 H -436.4 kJ 2 Br- → Br2 H -192.5 kJ 2 H+ + 2 Br- →2 HBr H -144.8 kJ

asked by john on April 2, 2015
83. ## SCIENCE(PHYSICS)

A train travels 40 km/hr for 0.2 hr, 50km/hr for next 0.2hr and 60km/hr for next 0.4 hr.calculate the average speed of train. PLEASE SOLVE THE QUESTION WITH ANSWER AS I WAS NOT ABLE TO GET THE ANSWER

asked by YASH on May 23, 2011
84. ## chemistry

A car uses 114 g of petrol to travel one mile. Calculate the mass of carbon dioxide produced when this car travels one mile.

asked by Reece on April 20, 2013
85. ## Algebra

The formula I = PRT where I = Interest, P = principal, R = rate, and T = time is used to calculate the amount of simple interest earned. Solve this formula for T.

asked by Kay on October 22, 2016
86. ## Chemistry

You have 2m^3 of a mineral ore sample. It has a mass of 1x10^4 kg. Calculate the density of the ore sample and express your results in g/cm^3 with appropriate scientific notation.

87. ## Maths

A rectangular floor measures 10m by 6m. A piece of rectangular carpet measuring 6m by 4m is placed in the middle of it. Calculate the area of the UNCOVERED floor.

asked by Faith on October 11, 2015
88. ## Physics

The position of a particle in meters is given by x =3.6t2 - 2.4t3 , where t is time in seconds. A) Find the two times when the velocity is zero. B) Calculate the position for each of those times.

asked by Vickie on March 4, 2012
89. ## chemistry

how do you calculate the empirical formula of the barium hydroxide hydrate if a sample consists of 3.70 grams of barium hydroxide and 2.64 gras of water???

asked by Marissa Turner on February 3, 2012
90. ## science

A man has a mass of 80.0kg is standing on the surface of the earth.(a)calculate the magnitude of the attractive force that the earth exerts on the man

asked by Anonymous on May 19, 2019
91. ## physics

Battery supplies a potential difference of 6v At a certain temperature the current in the 45ohms resistor is 0.08A How would you calculate the potential difference across the thermistor? thanks :)

asked by peter on December 8, 2010
92. ## chemistry

when iron is heated in a steam of dry chlorine, it produces a chloride that contains 34.5% by mass iron. calculate the empirical formula of this chloride.

asked by habiba on July 23, 2010
93. ## PHYSICS

The height of a tower is 25m. A stone is thrown upwards from the top of the tower at 20.5m/s. Calculate the total time the stone was in the air.

asked by MAMBA NP on October 16, 2015
94. ## Physics

A proton collides head on with a helium atom at rest. Their combined velocity after the collision is 8 x 10^5 ms^-1. Calculate the initial velocity of the proton. *** HELP PO PLEASE!!

asked by Carolyn Bautista on January 31, 2013
95. ## Physics

A proton collides head on with a helium atom at rest. Their combined velocity after the collision is 8 x 10^5 ms^-1. Calculate the initial velocity of the proton. *** HELP PO PLEASE!!

asked by Carolyn Bautista on January 31, 2013
96. ## chemistry

50J of energy is transferred as work is done on the system. 30J of heat is also absorbed by the system. Calculate the change in internal energy.

asked by jaycab on January 23, 2011
97. ## physics

a converging mirror of focal length 20cm forms an image which is twice the size of the object .calculate 2 possible distances of the object from the mirror?

asked by shajal on November 19, 2012
98. ## Math

An equilateral triangle is inscribed in a circle. If the radius of the circle is 10 cm, calculate the length of a side of the triangle. Answer to nearest whole centimetre

asked by Anonymous on November 16, 2014
99. ## AP Bio (but its a question about chemistry)

i have no idea how to do this! Calculate the volume of the specified titrant required to neutralize 35 ml of .4 M NaOH. Titrant: 0.75 M H2SO4 [2NaOH + H2SO4 „» 2H2O + Na2SO4]

asked by katie on July 24, 2011
100. ## Physics

A proton collides head on with a helium atom at rest. Their combined velocity after the collision is 8 x 10^5 ms^-1. Calculate the initial velocity of the proton. *** HELP PO PLEASE!!

asked by Carolyn Bautista on January 31, 2013