# 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 126
1. ## Chemistry

You have to prepare a pH 3.50 buffer, and you have the following 0.10M solutions available HCOOH, CH3COOH, H3PO4,CHOONa, CH3COONa, and NaH2PO4. a) What solutions would you use? b) How many milliliters of each solution would you use to make approximately 1

asked by Caitlin on April 21, 2015
2. ## chemistry

How many formula units are in 1.31 mg of hydrogen peroxide (H2O2)? Answer in units of formula units. For 508 g of butadiene (C4H6) calculate the number of moles. Answer in units of mol. Calculate the number of molecules. Answer in units of molec. 016 1.0

asked by Erika on January 10, 2016
3. ## Science

Lead(ll) Iodide can be produced from the reaction of Lead(ll) nitrate and potassium Iodide.What mass of lead(ll) iodide is produced when 50.0 mL of each solution is combined,forming a 0.750 M Solution of potassium nitrate? Please help me to solve this

asked by Christ on February 15, 2017
4. ## chemistry

An Ideal solution is formed by mixing 0.26 mol of pentane (vapor pressure + 511 torr) with 0.34 mol of hexane (vapor pressure = 150 torr). What is the total vapor pressure of the ideal solution?

asked by Anonymous on March 6, 2014
5. ## Chemistry

The absorbance of a chlorophyll a standard solution in ethanol (density = 0.785 g/mL) is measured in a 1.3 cm cuvette or path length. The absorbance is 0.435 and the molar absorptivity coefficient is 86,300 M–1cm–1. The molecular weight for chlorophyll

asked by Anonymous on July 16, 2012
6. ## chem 211

When 20.0 mL of 0.535 M H2SO4 is added to 20.0 mL of 1.07 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate H of this reaction per mole of H2SO4 and KOH reacted. (Assume that the total volume is the sum of the

asked by beti on October 18, 2013
7. ## chemistry

Suppose that a compound Z had a partition coefficient of 8 in ether-water. If 10g of z was dissolved in 100mL of water, and if the water solution was extracted with two 100 mL portions of ether, answer the following questions a) what is the total amount of

asked by carol on February 13, 2011
8. ## Math calculation

A stock bottle contains 2.5 L of solution. How many 2 oz bottle can be filled using the stock solution?

asked by Samantha on May 14, 2016
9. ## Calculus

Find the particular solution of the differential equation particular solution of the differential equation dy/dx=(x−7)e^(−2y).

asked by Robin on November 15, 2013
10. ## Math calculation

A stock bottle contains 2.5 L of solution. How many 2 oz bottle can be filled using the stock solution?

asked by Samantha on May 16, 2016
11. ## chemistry

If you have a solution that is 1.7 M sodium chloride and you have 1 L of that solution, how many moles of sodium chloride do you have?

asked by emily on October 28, 2011
12. ## Chemistry (quick clarification please?)

Is 50 ml of a 50 mM solution of NaCl the same concentration as 100 ml of a 100 mM solution of NaCl?

asked by Anne on September 5, 2012
13. ## AP Chemistry

If the pH of a nitric acid solution is 2.34, then what is the molarity of nitric acid in the solution? A. 1.6 × 10-4 M B. 3.8 × 10-3 M C. 2.2 × 10-2 M D. 4.6 × 10-3 M

asked by jessica on September 14, 2016
14. ## Pensacola State

The solubility of NH3 in H20 is 518 g/L at a partial pressure of 760.0 torr. 1. Calculate the value of the Henry's Law constant for NH3. 2. calculate the solubility of NH3 in H2O at a partial pressure of 225.0 torr.

asked by Jen on December 6, 2011
15. ## chemistry

Suppose a substance has been prepared that is composed of carbon, hydrogen, and nitrogen. When 0.1156 gram of this compound is reacted with oxygen, 0.1638 gram of carbon dioxide (CO2) and 0.1676 gram of water (H2O) are collected. Assuming that all the

asked by Chansa on June 3, 2016
16. ## Physics

I have to design a procedure which allows me to calculate the applied rocket thrust force of a stomp rocket. The only materials I am allowed are stop watches, rulers, measuring tape, protractors and the stomp rocket. Basically it all has to be done

asked by Mackenzie on July 22, 2010
17. ## Physics

Calculate the force needed to bring a 1100–kg car to rest from a speed of 83.0 km/h in a distance of 118 m (a fairly typical distance for a non-panic stop). Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 1.82

asked by Emiliee on March 16, 2016
18. ## science

this is a follow up question from my last one with the exact question If you dissolve 200 g of salt in 20 l of water, what is the density of that solution of salty water? Hint: In this particular example, assume that the total volume doesn’t change when

asked by dean on February 25, 2017
19. ## chemistry

At 650 degree C and a pressure of 690mm HG, the 0.927g sample has a volume of 194cm3. How do I calculate the volume at the same temp but at a pressure of 760mm Hg? Also, how do I calculate the volume at the same pressure but at a temp of 0 degree C? Thanks

asked by sarah on February 26, 2007
20. ## physics

Two particles A and B of respective masses M(B) and M(A) are connected together by means of an inextensible string of negligible mass. The string passes over the groove of a pulley of negligible mass. At instant to=0 the system S(pulley,mass,string) is

asked by vicky on September 20, 2016
21. ## computer Programming

A small startup software developer company needs to create a program that will calculate the pay of its employees. For the third version of the program, the company wants the program to accept an employee’s name, the number of hours the employee worked,

asked by jesse on January 28, 2011
22. ## Math 2 questions

I need help with 2 questions so that I could do my other ones myself so can someone please do these 2 questions so i get an example how to do them, thanks. 1. Lauren works for a bookstore. One of the stores suppliers has a promotion in which any in stock

asked by Anonymous on May 22, 2013
23. ## chemistry

50.0 mL of a solution of HCl is combined with 100.0 mL of 1.15 M NaOH in a calorimeter. The reaction mixture is initially at 22.4°C and the final temperature after reaction is 31.2°C. What is the molarity of the HCl solution? You may assume that there is

asked by Marcus on February 28, 2015
24. ## Gen Chem 1

A tanker truck carrying 2.01×10^3kg of concentrated sulfuric acid solution tips over and spills its load. The sulfuic acid is 95.0% H2SO4 by mass and has a density of 1.84g/L. Sodium Carbonate (Na2CO3)is used to neutralize the the sulfuric acid spill. How

asked by Rachel on October 6, 2010
25. ## Chemistry HELP!!!!

Nitric oxide (NO) reacts with molecular oxygen as follows: 2NO(g) + O2(g) ¨ 2NO2(g) Initially NO and O2 are separated as shown below. When the valve is opened, the reaction quickly goes to completion. Determine what gases remain at the end of the

asked by mia on October 31, 2010
26. ## Chemistry

Nitric oxide (NO) reacts with molecular oxygen as follows: 2NO(g) + O2(g) ¨ 2NO2(g) Initially NO and O2 are separated as shown below. When the valve is opened, the reaction quickly goes to completion. Determine what gases remain at the end of the

asked by Sarah on October 31, 2010
27. ## Chemistry

How would the titration curve of hydrochloric acid solution differ if barium hydroxide was used to titrate instead of sodium hydroxide? How would the titration curve of hydrochloric acid solution with sodium hydroxide differ from the titration curve of

asked by Niki on March 6, 2012
28. ## Chemistry

A 1.50 g sample of glucose (C6H12O6) is burned in a bomb calorimeter that contains water at 25.0 0C. The heat capacity of the bomb calorimeter is 1046 J/0C. When the glucose is combusted, the temperature of the water rises to 47.4 0C. Calculate the heat of

asked by Mark on October 18, 2015
29. ## Mechanical science

The table planning machine is driven horizontally by hydraulic pressure on a piston contained in a cylinder 80mm in diameter. The on the cutting tool is 5KN,the Mass of the moving part is 1000kgs and coificient friction is 0.05.calculate pressure required

asked by Charles waweru on February 20, 2018
30. ## chemistry

Concentrated hydrochloric acid is a 38% solution of hcl in water and has a density of 1.18g/ml. How many milliliters of concentrated hydrochloric acid are needed to prepare 500ml of a 1:200 hcl solution? My calculation 500ml x 1:200 =2.5 1:200 means

asked by Fai on August 9, 2012
31. ## programming concepts

Mr. Jones always gives True/False tests to his class. His tests always have 20 ques- tions. The maximum class size is 35. He needs a program that will calculate the stu- dents’ grades based on the best score. Grade A will range from the best score, to

asked by sam on May 15, 2015
32. ## programming concepts

Mr. Jones always gives True/False tests to his class. His tests always have 20 ques- tions. The maximum class size is 35. He needs a program that will calculate the stu- dents’ grades based on the best score. Grade A will range from the best score, to

asked by sam on May 15, 2015
33. ## (19) Chemistry - Science (Dr. Bob222)

Use the following information to answer this question: Cu+(aq) + e- → Cu(s) E° = 0.521V Cu2+ (aq) + e- → Cu+ (aq) E° = 0.153 V. Given these half cell reactions, an aqueous solution of Cu+ ion in the absence of O2(g) : A. will be thermodynamically

asked by Ana on May 8, 2014
34. ## Algebra/no response yesterday

I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6,

asked by Anonymous on January 7, 2010
35. ## algebra

I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6,

asked by shane on January 7, 2010
36. ## Math/Check

I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6,

asked by S on January 7, 2010
37. ## Algebra/math

I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6,

asked by shane on January 6, 2010
38. ## Algebra

I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6,

asked by Shane on January 6, 2010
39. ## science

A lab technician adds 0.035 mol of KCl to 1.00 L of 0.0050 M Pb(NO3)2. Ksp = 1.7 × 10–5 for PbCl2. Which of the following statements is correct? a) Lead chloride precipitates until the solution is saturated. b) The solution is unsaturated and no

asked by michelle gloska on May 9, 2017
40. ## math

Beer cans are right circular cylinders. My Mathematical Mead, my Polynomial Pilsner, and my Square-Root Stout cans from the Schmidt Brewery, have dimensional units called "brewskies". Using the zero product rule, they have a volume (in cubic brewskies)

asked by Jeremie on December 10, 2012
41. ## Chemistry

Tooth enamel is made up of hydroxyapatite, Ca_10(PO_4)_6(OH)_2 or the empirical formula, Ca_5(PO_4)_3(OH). Use the empirical formula for all calculations because stoichiometry plays two significant roles. A. Print the balanced chemical equation for the

asked by John on April 7, 2011
42. ## SUPER URGENT-- CHEMISTRY

1. .0025 M tartric acid completely reacts with .0030 m of al bicarbonate if .913 l of co2 forms at 298 k with pressure of 1.4 ATM how much base used? 2. 3.1 x 10^23 molec of .0035 m hydriodic acid reacts with 25 g of magnesium bicarbonate how much carbon

asked by Danny on May 21, 2012
43. ## Engineering

The angular velocity of a rigid body rotating about an axis of rotation is w = 5^i + 2^j - 4^k rad. per. sec. Determine the linear velocity of point B on the body with a position vector r = 3^i - ^j + 3^k ft. directed from a point on the axis of rotation.

asked by Aaron on February 12, 2012
44. ## chemistry

Calculate values of for the following sparingly soluble solutes. Calculate value of Ksp for AgI (delta Gf(Ag^+)=77.11 kj mol^-1 , delta Gf(I^-) =-51.57 kJ mol^-1, delta Gf(AgI) =-66.19 kJ mol^-1).

asked by Allyx3 on December 2, 2012
45. ## Chemistry

Some properties of aluminum are summarized in the following list. normal melting point 658°C heat of fusion 0.395 kJ/g normal boiling point 2467°C heat of vaporization 10.52 kJ/g specific heat of the solid 0.902 J/g°C (a) Calculate the quantity of

asked by Charles on May 1, 2010
46. ## chemistry

Some properties of aluminum are summarized in the following list. normal melting point 658°C heat of fusion 0.395 kJ/g normal boiling point 2467°C heat of vaporization 10.52 kJ/g specific heat of the solid 0.902 J/g°C (a) Calculate the quantity of

asked by Jake on May 1, 2010
47. ## Organic Chemistry

I am suppose to calculate the theoretical amount (volume) of 3M sodium hydroxide needed to convert 1.5 g of benzoic acid to its salt. Also calculate the volume of 12M HCl needed to convert the sodium benzoate back to benzoic acid. how do I go about doing

asked by Jake on May 18, 2010
48. ## Physics

A 251-N force is directed horizontally as shown to push a 25.1-kg box up a ramp at a constant speed. There is friction between the box and the ramp. (a) Calculate the magnitude of the normal force of the ramp on the box. (b) Calculate the coefficient of

asked by Anonymous on October 9, 2018
49. ## ap chem

Assuming the volumes of all gases in the reaction are measured at the same temperature and pressure, calculate the volume of water vapor obtainable by the explosive reaction of a mixture of 725mL of hydrogen gas and 325mL of oxygen gas. andd... Calculate

asked by Alicia on December 29, 2007
50. ## science

Calculate the number of molecules in a deep breath of air whose volume is 2.68 L at body temperature, 37°C, and a pressure of 743 torr (b) The adult blue whale has a lung capacity of 5.0 103 L. Calculate the mass of air (assume an average molar mass 28.98

asked by Samantha on December 15, 2012
51. ## Chemistry

In an experiment to measure the solubility of Ba(OH)2 x 8H2O in water, an excess of solid Ba(OH)2 x 8H2O was stirred with water overnight. the saturated solution was allowed to stand until all the undissolved solid had settled. a 10.00mL sample of the

asked by Anne on October 25, 2012
52. ## Chemistry- Dr.Bob222

What is the pH of a solution that is 0.150 M in acetic solution and 0.300 M in sodium acetate? The Ka of acetic acid is 1.8 x 10^-5. My work: pH= pKa + log (base/acid) pH= -log (1.8 x 10^-5) + log (0.300/0.150) pH=5

asked by Nevaeh on April 11, 2016
53. ## SCIENCE/MATH

Land growing continuous grain corn as a cash crop loses soil at a rate of 14.0 metric tonnes ha-1 yr-1. This is a fertile soil, which has an organic matter content of 3.8% and nitrogen content of 0.35% (both by mass). a)Calculate how long it will take to

asked by SAMY on November 6, 2009
54. ## Math

Land growing continuous grain corn as a cash crop loses soil at a rate of 14.0 metric tonnes ha-1 yr-1. This is a fertile soil, which has an organic matter content of 3.8% and nitrogen content of 0.35% (both by mass). a) Calculate how long it will take to

asked by rina math help on November 10, 2009
55. ## PHYSICS!!

I've tried this problem again and again using conservation of momentum and energy but I am not having any luck: A ball of mass 0.300kg that is moving with a speed of 8.0m/s collides head-on and elastically with another ball initially at rest. Immediately

asked by Alison on October 11, 2013
56. ## math

A ship leaves port and travels 21km on a bearing of o32 degrees and then 45km on a bearing of 287 degrees. a. calculate its distance from the port. b. calculate the bearing of the port from the ship

asked by Simon Silas Bako on February 23, 2019
57. ## Chemistry

A reaction of importance in the formation of smog is that between ozone and nitrogen monoxide described by O3(g)+NO(g) --> O2(g)+NO2(g) The rate law for this reaction is: rate=k[O3][NO] Given that k = 2.87 × 106 M–1·s–1 at a certain temperature,

asked by Ceamus Angelina on July 2, 2018
58. ## Chemistry

A reaction of importance in the formation of smog is that between ozone and nitrogen monoxide described by O3(g)+NO(g) --> O2(g)+NO2(g) The rate law for this reaction is: rate=k[O3][NO] Given that k = 2.87 × 106 M–1·s–1 at a certain temperature,

asked by Ceamus Angelina on July 1, 2018
59. ## U.S. and Global Economics: Involving MATH

PLZZZ.. Help I just don't understand how to calculate this A landlord wants to acquire an additional apartment building for \$250,000. The new building contains eight apartment units, which will each rent for \$500 per month. The bank is willing to loan the

asked by Mary on November 13, 2013
60. ## Puerto Rican Studies

Jim Cummins' intervention model offers solution that could reverse the academic failure experienced by the Puerto Ricans students in American school which have existed for generations. Assess their history of integration in American society and their

asked by Terry on December 11, 2008

I have a test tomorrow with a few sample questions that are expected to be on the test that I do not know how to properly do. 1)Find the slope intercept equation of the line passing through the intersection of the lines 2x-4y=1 & 3x+4y=4 and parallel to

asked by JBregz on March 23, 2014
62. ## Math - Quadratics & Analytical Geometry

I have a test tomorrow with a few sample questions that are expected to be on the test that I do not know how to properly do. 1)Find the slope intercept equation of the line passing through the intersection of the lines 2x-4y=1 & 3x+4y=4 and parallel to

asked by Jay on March 23, 2014
63. ## Chemistry

a glavanic cell is set up by connecting the following half-cells together: nickle electrode in nickel nitrate solution and a copper electrode in copper nitrate solution. in which half-cell will oxidation occur? in which half-cell will reduction occur?

asked by Cori on July 19, 2009
64. ## Help me with this math ms sue.

Multiple Choice 1. Calculate the slant height for the given cone. Round to the nearest tenth. cone (1 point) 10.2 cm 11.4 cm 9.8 cm 12.0 cm 2. Calculate the slant height for the given cone. Round to the nearest tenth. cone (1 point) 11.2 cm 12.5 cm 14.8 cm

asked by josh on February 27, 2014
65. ## math

Consider the following set of data. (18, 12), (29, 48), (65, 29), (82, 24), (115, 56), (124, 13) (a) Calculate the covariance of the set of data. (Give your answer correct to two decimal places.) Incorrect: Your answer is incorrect. . (b) Calculate the

asked by tracy12 on June 25, 2013
66. ## Physics (verification)2

I would love for someone to please verify my solution for this problem: A former amusement park attraction consisted of a huge vertical cylinder rotating rapidly around its axis. The rotation speed should be sufficient for the people found inside to be

asked by Greg on December 10, 2011
67. ## Physics (verification)

I would love for someone to please verify my solution for this problem: A former amusement park attraction consisted of a huge vertical cylinder rotating rapidly around its axis. The rotation speed should be sufficient for the people found inside to be

asked by Greg on December 9, 2011

King’s Service Station uses two kinds of cleaning solution containing acid and water. “Attack” is 2% acid and “Blast” is 6% acid. They want to mix the two to get 60qt of a solution that is 5% acid. How many quarts of each should they use. Let a =

asked by Kell on May 8, 2008
69. ## math

Determine all the possible values of x where 0 deg is more than or equal to x and x is more or equal to 360 deg such that i'm not sure the solution, please correct it and how to find the x value, 2 tan x - 1 = cot x solution: (sec x -1)(sec x + 2) = 0 sec

asked by choi2463 on April 15, 2013
70. ## scale drawing

given that the scale on a map is 1:0000 (a)calculate the actual distance between 2 points if the distance an map is 6.5cm (b)calculate the distance on the map that will represent an actual distance of 45km

asked by Anonymous on November 17, 2015
71. ## AP Chem need serious explanation

Calculate the number of moles of carbon atoms present in 1.4 g of ethanol (C2H6O). i get that you calculate the number of moles of ethanol whic i got was .03039 but how do you get the moles of CARBON from that.

asked by Joe King on September 22, 2012
72. ## Chemistry Bobpursley

Please choose the correct option to complete the following statements. (6 marks) a) If a large amount of base is added to water, the pH of resulting solution would most likely Increase/decrease/remain the same Explain your choice b) If a small amount of

asked by Many on November 7, 2012
73. ## Physics!

A 0.3 kg brick is dropped form a height of 8 meters. It hits the ground and comes to rest. a) Calculate the impulse exerted by ground on the brick. b) It takes 0.0013 seconds from the time the brick first touches the ground until it touches the ground.

asked by Carol on January 15, 2013
74. ## Physics

A 251-N force is directed horizontally as shown to push a 25.1-kg box up a ramp at a constant speed. There is friction between the box and the ramp. The angle of ramp is 30 degrees. (a) Calculate the magnitude of the normal force of the ramp on the box.

asked by Anonymous on October 11, 2018
75. ## Chemistry

The Cu2+ ions in this experiment are produced by the reaction of 1.0g of copper. Information already found out .016 mol Cu2+ produced Overall reaction is Cu2+(aq)+Cl-(aq)+Cu(s)=2 CuCl(s) Maximum mass of CuCl that can be prepared from the reaction sequence

asked by Julie on October 23, 2012

A hollow brass cylinder is weighed on a pan balance (kitchen scale) which read in kg. The scale reading is 5.56 kg. The brass cylinder is now removed from the scale and is replaced by a beaker of liquid density 1.56 * 10^3 kg/m^3; the scale now reads 17.50

asked by Alexandria on August 9, 2011
77. ## Chem

a) A weak acid, HX, is 1.3% ionized in .20 M solution. What percent of HX is ionized in a .030 M solution? b) Does the percent ionization increase or decrease upon dilution? c) Does the H3O+ concentration of the above weak acid increase or decrease?

asked by TS on April 18, 2016
78. ## chemistry

a saturated solution of barium chloride at 30 degrees Celsius contains 150 g water. how much addition barium chloride ca be dissolved by heating this solution to 60 degrees celsius? bacl2 at 30 degrees= 38.2 bacl2 at 60 degrees= 46.6

asked by sam on November 27, 2012
79. ## PRECALC

A drug is administered every 6 hours. The kidneys eliminate 55% of the drug over that period. The initial dose is 210 mg. Repeated dosage is 70 mg What is the “Difference equation”? Find the first seven terms of the of the solution sequence. Round to

asked by Grant on May 18, 2016
80. ## chemistry

The question asks, "Butanoic acid has a partition coeff of 3.0 when distributed b/t water and benzene. Find the formal concentration of butanoic acid in each phase when 100 mL of 0.10 M aqueous butanoic acid is extracted with 25 mL of benzene at pH 10.00."

asked by For Dr. Bob on November 15, 2009
81. ## stats

Consider an infinite population with 25% of the elements having the value 1, 25% the value 2, 25% the value 3, and 25% the value 4. If X is the value of a randomly selected item, then X is a discrete random variable whose possible values are 1, 2, 3, and

asked by Mischa on November 5, 2008
82. ## algebra 1

The function H(t) = −16t^2 + 90t + 50 shows the height H(t), in feet, of a projectile after t seconds. A second object moves in the air along a path represented by g(t) = 28 + 48.8t, where g(t) is the height, in feet, of the object from the ground at

asked by Simon on May 19, 2016
83. ## algebra 1

The function H(t) = −16t^2 + 90t + 50 shows the height H(t), in feet, of a projectile after t seconds. A second object moves in the air along a path represented by g(t) = 28 + 48.8t, where g(t) is the height, in feet, of the object from the ground at

asked by Simon on May 19, 2016
84. ## chem

what color change happen when you add a solution containing Ag+ ion to the mixture AgSCN? How is this consistent with LeChatelier's principle? pls correct my answer. my answer is a more white solid or pecipitate form due to insoluble AgSCN. It is

asked by Andrew78 on November 25, 2012
85. ## chem

what color change happen when you add a solution containing Ag+ ion to the mixture AgSCN? How is this consistent with LeChatelier's principle? pls correct my answer. my answer is a more white solid or pecipitate form due to insoluble AgSCN. It is

asked by Andrew78 on November 25, 2012
86. ## chemistry, biotechnology

The question is: "The molar extinction coefficient of pure antibody is 1.4 absorbance units per milligram antibody @280nm. You have a concentrated antibody solution, so you make a 5-fold dilution and measure @280, getting an absorbance of 0.845. What is

asked by Jennifer on October 2, 2014
87. ## Chemistry

A galvanic cell is connected to a small light bulb for 40.0 minutes. The electrodes are copper and silver and the copper electrode is immersed in a solution of copper sulfate. During that time, the average current drawn by the bulb is 0.12 A. a. What is

88. ## math. plzz help

calculate the slant height for the given square pyramid. Round to the nearest tenth. Pyramid base= 6cm height=5 cm 6.2 cm 5.8 cm 7.8 cm 7.2 cm Calculate the length of the diagonal for the given rectangular prism. Round to the nearest tenth. Length= 10 cm

asked by anonymous on March 11, 2014
89. ## Math help, anyone?

calculate the slant height for the given square pyramid. Round to the nearest tenth. Pyramid base= 6cm height=5 cm 6.2 cm 5.8 cm 7.8 cm 7.2 cm Calculate the length of the diagonal for the given rectangular prism. Round to the nearest tenth. Length= 10 cm

asked by Princess Anna on March 10, 2014
90. ## Chemistry

If the volume of ocean water 7.41*10^20 L contains 2.9 percent sodium chloride ("salt") by mass and the density of the water is 1.26 g/mL, calculate the total mass of sodium chloride. (1 ton = 2000 lb, 1 lb = 453.6 g) Calculate the mass of sodium chloride

asked by Jamie on September 8, 2013
91. ## physical science

a bot throws a cricket ball witg an initial velocity of 5m.s from the edge of a tall building.it passes the edge of the building on its way down and strikes the ground below after 5seconds (neglect effects of friction. question1...how does the acceleration

asked by kgaogelo on March 13, 2013
92. ## physical science

a bot throws a cricket ball witg an initial velocity of 5m.s from the edge of a tall building.it passes the edge of the building on its way down and strikes the ground below after 5seconds (neglect effects of friction. question1...how does the acceleration

asked by kgaogelo on March 13, 2013
93. ## chemistry

Caclulate the Ka of nitrous acid if a 0.200 mol/L solution at equilibrium at SATP has a percent ionization of 5.8% ka=(H+)(NO2-)/(HNO2-) If 1.59% ionized then after ionization H+ = 0.2 x 0.058 =? NO2- = 0.2 X 0.058=? HNO2=0.2 x (1.0 - 0.058) If solution is

asked by Dustin on April 7, 2008
94. ## Physics

(a) In the diagram above the small semi-circle in the wire above R_1 indicates that it is not in contact with the horizontal wire which it appears to intersect due to the 2-dimensional projection. Additionally, the horizontal wire is continuous, not

asked by Phy on April 5, 2013
95. ## physics

A pendulum consists of a uniform disk with radius r = 10 cm and mass 480 g attached to a uniform rod with length L = 500 mm and mass 175 g. (a) Calculate the rotational inertia of the pendulum about the pivot. (b) What is the distance between the pivot and

asked by john on April 15, 2007
96. ## Physics

A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H of 32.0 m above sea level, directed at an angle θ above the horizontal with an unknown speed v0. The projectile remains in

asked by Anonymous on December 2, 2014
97. ## geometry

I had to complete the following solution by filling in the missing statements and reasons. I filled out the statements, but am having trouble wording the last two reasons. Following solution: x-2(3x-4)=18 Statement: x-2(3x-4)=18 Reason: Given Statement:

asked by Bridget on April 18, 2015
98. ## math

a group of fifth grade students in New Zealand are going camping. They will hike from Wellington to Ruapehu. Then they will follow a trail for another 1/2 mile to their campsite. I was able to calculate the distance from Wellington to Ruapehu by using the

asked by hope on September 15, 2010
99. ## Algebra

Can you please help me with this problem: The x-intercept of a line has a value of -7/6 and a y-intercept of 7. Another line has a slope that is twice the slope of the first line an a y-intercept that is 15 more than the first lines' y-intercept. What is

asked by Chris on December 10, 2016
100. ## Chemistry

1) When calcium is reacted with cold water, the equation is as follows: - Ca(s) + H2O(l) -->Ca(OH)2(aq) + H2(g) Isn't Ca(OH)2 insoluble? Why is the state symbol aqueous? When I conducted the experiment in a test tube with cold water, I got a white

asked by candy on January 31, 2009