# How many moles are there in a 30 cm diameter basketball at a pressure of 160 kpa and temperature of 25 degree celcius

22,676 questions, page 186
1. ## chemistry

The gaseous product of a reaction is collected in a 12.0 L container at 280C. The pressure in the container is 3.5 atm and the gas has a mass of 96.0 g. What is the molecular mass of the gas?

asked by Anonymous on February 28, 2013
2. ## chemistry

A 3.00- flask is filled with gaseous ammonia, . The gas pressure measured at 28.0 is 1.55 . Assuming ideal gas behavior, how many grams of ammonia are in the flask?

asked by Lili on October 12, 2008
3. ## Chemistry

The gaseous product of a reaction is collected in a 25.0-L container at 27 C. The pressure in the container is 216 kPa, and the gas has a mass of 96.0 g. What is the molar mass of the gas?

asked by Ashleigh on December 15, 2010
4. ## chem2

vapor pressure is 50.0 has a 17.0 torr 36.1g unknown elect. density 1.05g/ml, vapor pressur h20 50c=92.5 torr find what the unknown wt is.

asked by jeanette on March 11, 2011
5. ## chemistry

A 3.00- flask is filled with gaseous ammonia, . The gas pressure measured at 28.0 is 2.35 . Assuming ideal gas behavior, how many grams of ammonia are in the flask?

asked by chris on March 24, 2012
6. ## Chemistry

If the temp of a quanity of gas changes from 100C to 200C will the volume of the gas double if the pressure remains constant? I know that the volume will increase but i am not sure if it will double or not?

asked by Amy on November 9, 2009
7. ## Chemistry

The gaseous product of a reaction is collected in a 25.0-L container at 27 C. The pressure in the container is 216 kPa, and the gas has a mass of 96.0g. What is the molar mass of the gas?

asked by Elana on January 3, 2011
8. ## Chem.

Ethanol has a heat of vaporization of 38.56 KJ/Mol. And a normal boiling point of 78.4 degrees celcius. WHAT is the vapor pressure of ethanol at 18 degrees celcius??

asked by Joseph on February 10, 2010
9. ## Physics

Two ideal gases have the same mass density and the same absolute pressure. One of the gases is helium (He), and its temperature is 298 K. The other gas is neon (Ne). What is the temperature of the neon?

asked by Frustrated on December 3, 2012
10. ## Chemistry

When sodium burns in air it produces a bright white light and heat energy 2Na + O2 2Na2O ?H = -414kJ/mol What would you expect to be the heat energy associated with the reverse process 2Na2O 2Na + O2 Can you please show the entire calculation with units

asked by Timofey on June 5, 2013
11. ## Chemistry

I am trying to find the theoretical yield for this lab I am working on. The steps to finidng it would be great. In my lab I took 40mls of H2O + 4g of AgNO3+ 8g of NaCL then I stirred it and filtered in a buchner funnel to be left with 6.7496g of silver

asked by Gweedo8 on June 7, 2009
12. ## chemistry

The thermal decomposition of calcium carbonate produces 2 by-products, c02 and calcium oxide. calculate the volume of the co2 produced at STP from the decomposition of 231 grams of caco3. i know the equation i need to use is V=nrt/p but am i supposed to

asked by Katherine on February 18, 2010
13. ## Chemistry - DrBob222

When sodium burns in air it produces a bright white light and heat energy 2Na + O2 2Na2O ?H = -414kJ/mol What would you expect to be the heat energy associated with the reverse process 2Na2O 2Na + O2 Can you please show the entire calculation with units

asked by Timofey on June 5, 2013
14. ## physics

We start with 5.00 moles of an ideal monatomic gas with an initial temperature of 123C. The gas expands and, in the process, absorbs an amount of heat equal to 1300J and does an amount of work equal to 2040J. What is the final temperature of the gas? Use

asked by Annie on October 4, 2009
15. ## Chmistry

pcl3(g) cl2(g) ¨

asked by Marie on April 16, 2015
16. ## Science

If .275 moles of ferrous ammonium sulfate (Fe(NH4)2(SO4)2. 6H2O) and an excess of all other reagents are used in a synthesis of K3[Fe(C2O4)3].3H2O, how many grams of product will be obtained if the reaction gives a 100% yield? Can someone help me solve

asked by Anna on January 7, 2012
17. ## chem

Balance the equation and answer in terms of moles. Chlorine gas can be produced commercially by passing an electric current through a con-centrated solution of sodium chloride (brine). The unbalanced equation is NaCl(aq) + H2O(`) ! NaOH(aq) + Cl2(g) +

asked by jack on February 15, 2012
18. ## Physics

A cyclist intends to cycle up a 7.5 degree hill whose vertical height is 170 m. Assuming the mass of bicycle plus cyclist is 95 kg, calculate how much work must be done against gravity. If each complete revolution of the pedals moves the bike 5.6 m along

asked by Linda on November 16, 2010
19. ## English

Word box abstain accommodate allegiance amalgamate append commemorate enumerate exalt extort far-fetched glum replica responsive sanctuary self-seeking submissive tally taskmaster transform upheaval 2.Good employees don't need a(n)) ____ to keep them

asked by Jerald on April 16, 2013
20. ## Geometri euclid

The small circle and the large circle have the same center O. Chord AB is tangent to the smaller circle at C. Prove that the area between the large and small circle is the same as the area of the circle that has AB as a diameter

asked by Maria on July 30, 2016
21. ## Chemical Engineering

High-pressure helium is available from gas producers in 0.045-m^3 cylinders at 400 bar and 298 K. Calculate the explosion equivalent of a tank of compressed helium in terms of kilograms of TNT. Assume helium is an ideal gas

asked by Anonymous on March 18, 2015
22. ## Chemical Engineering

High-pressure helium is available from gas producers in 0.045-m^3 cylinders at 400 bar and 298 K. Calculate the explosion equivalent of a tank of compressed helium in terms of kilograms of TNT. Assume helium is an ideal gas

asked by Anonymous on March 18, 2015
23. ## chemistry

A sample of NH4HS (s) is placed into a 2.65 L flask, containing 0.140 mols of NH3 (g). NH4++++>>nh3 (g) + h2s (g) KP = 0.108 wHAT will be the total gas pressure at 25 degrees in atm. I got about 1.361...i don't kno what im doing wrong. im multiplying the

asked by anonymous on March 17, 2010
24. ## Physics

48.0 g of oxygen (O2 is diatomic) are confined in a rigid 1.00x10^3 L cubical container at temperature 300.0 K. Find the gas pressure and the force exerted by the oxygen gas on any of the six faces of the cube. Mass number of an oxygen atom is 16.0

asked by Lashawn on April 24, 2013
25. ## physics

A 1.6 air bubble is released from the sandy bottom of a warm, shallow sea, where the gauge pressure is 1.6 . The bubble rises slowly enough that the air inside remains at the same constant temperature as the water. What is the volume of the bubble as it

asked by Anonymous on November 13, 2011
26. ## physics

An ideal gas occupies a volume of 1.87 cm3 at 15.7°C and a pressure of 101,325 Pa. a) Determine the number of molecules of gas in the container. Boltzmann’s constant is 1.38 x 10-23 m2kg/s2K Answer: b) Determine the total internal energy of the gas.

asked by abbey on May 9, 2018
27. ## Physics

A water bed that is 1.5 m wide and 2.5 m long weighs 1055 N. Assuming the entire lower surface of the bed is in contact with the floor, what is the pressure the bed exerts on the floor? (Round to the first decimal point and don't forget units.

asked by George on December 19, 2011
28. ## chemistry

A sample of NH4HS (s) is placed into a 2.65 L flask, containing 0.140 mols of NH3 (g). NH4++++>>nh3 (g) + h2s (g) KP = 0.108 wHAT will be the total gas pressure at 25 degrees in atm. I got about 1.361...i don't kno what im doing wrong. im multiplying the

asked by anonymous on March 17, 2010
29. ## chem

A sample of PCl5 weighing 2.69 grams is placed in a 1.000 liter flask and vaporized completely at 250 o C. The final pressure observed at this temperature is 1.000 atmospheres. Note that some, but not all of the PCl5 decomposes according to the equation:

asked by laura on December 6, 2011
30. ## Chemistry

A sample of oxygen is collected in a 387 mL container over water at 15◦C, and the barom- eter reads 738 torr. What volume would the dry gas occupy at 781 torr and 15◦C? Water’s partial pressure at 15◦C is 12.8 torr. Answer in units of mL

asked by Caitlin on November 20, 2012
31. ## AP Chemistry

Microwave ovens emit microwave radiation that is absorbed by water as heat. Suppose that the wavelength of the radiation that is 12.5 cm in an oven that has a power rating of 900 watts. (1W = 1 J/s) a) How many moles of photons are released per minute b)

asked by qwerty123 on November 16, 2010
32. ## Chemistry!

Use the equation below and determine what volume of O2 at STP is needed to react with 1.5 moles of C2H4? Balanced equation: C2H4 + 3O2 --> 2CO2 + 2H20 So 1 mole of C2H4/3 mol O2 --> 1.5 mols/ 4.5 mols O2. So if its 1 mol equals 1 liter, than it should be

asked by Casey on July 10, 2010
33. ## chemistry

A set of bookshelves rests on a hard floor surface on four legs, each having a cross-sectional dimension of 3.9 6.5 cm in contact with the floor. The total mass of the shelves plus the books stacked on them is 260. kg. Calculate the pressure in pascals

asked by Matthew on September 30, 2012
34. ## Science

Find the density and specific gravity of the following (a) SO2 at 700F and 1 atm (b) Mixture of 10 mole% CH4 and 90 mole% argon at 5400C and 28.9 inch Hg (c) Air containing 0.045 lbm H2O per pound mass of dry air at 2000F and 29.7 in Hg absolute pressure

asked by Man Singh Chouhan on March 26, 2015
35. ## chemistry

Dr bob can you help with my last question for tonights home work please A gas mixture consists of equal parts of methane(molecular weight 16.0) and argon (atomic weight40.0). if the partial pressure of argon is 26.6 kPa what is that of methane in the same

asked by Andy on May 11, 2010
36. ## Chemistry

What volume of gas can be produced in a lab where pressure is 16.0 psi and temperature is 25 C if you collect it over water from the reaction of 50g of ammonium sulfate with 50g of aluminum hydroxide. The equation for the reaction is: 3(NH4)2SO4 + 2Al(OH)3

asked by Victor on April 7, 2017
37. ## Chemistry

A set of bookshelves rests on a hard floor surface on four legs, each having a cross-sectional dimension of 2.7 5.2 cm in contact with the floor. The total mass of the shelves plus the books stacked on them is 246 kg. Calculate the pressure in pascals

asked by Courtney on December 1, 2012
38. ## chemistry

A student collected the following data for a fixed volume of gas: ￼Temperature (C) Pressure (mm of hg) 10 726 20 750 40 800 70 880 100 960 150 ??? Fill in the missing data point. Show all calculations leading to an answer. is the answer 1025 ?

asked by Ciaria on March 12, 2015
39. ## chemistry

A set of bookshelves rests on a hard floor surface on four legs, each having a cross-sectional dimension of 3.9 6.5 cm in contact with the floor. The total mass of the shelves plus the books stacked on them is 260. kg. Calculate the pressure in pascals

asked by Silena on February 27, 2014
40. ## Chemistry 2

In a study designed to prepare new gasoline resistant coatings, a polymer chemist dissolves 6.053g of poly in enough water to make 100.0 mL of solution. At 25C, the osmotic pressure of this solution is 0.272 atm. What is the molar mass of the polymer

asked by Mike on March 26, 2010
41. ## chemistry

Water (H20) is a liquid at room temperature and atmospheric pressure whereas hydrogen sulfide (H2S) is a gas under the same conditions. Based on this information, what can you say about the intermolecular interactions in these two substances. So would this

asked by Travis on September 16, 2012
42. ## chemistry

in an experiment 5.00ml of 0.1440 mol L^1- aqueos KIO3 was reacted with an excess of aqueous iodide and the molecular iodine I2, Formed was titrated against 0.1000mol L^1- aqueous S2O3^2- the equation for the titration reaction is: I2(aq)+ 2

asked by Yulieth on November 17, 2011
43. ## As physics

Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge A piece of fuse wire has a diameter of

asked by cylinder on December 12, 2017
44. ## Physics

A student makes ice cream using an old-fashioned hand-crank machine. He does 40 joules of work each time he turns the crank in a complete circle. The crank handle makes a circular path with a diameter of 0.5 meters. The student turns the crank at a rate of

asked by kek on February 10, 2017
45. ## physics As

Please help and do it step by step all parts of questions and use: T = time(s) I=current (amps) Q=net charge on object (Coulombs) N=no electrons (and write if added or removed from object and how) E=elementary charge A piece of fuse wire has a diameter of

asked by cylinder on December 14, 2017
46. ## chemistry

How many moles of magnesium is 1.25 x 1023 atoms of magnesium? A. 0.208 × 101 mol Mg B. 2.08 × 101 mol Mg C. 2.08 × 10 -1 mol Mg D. 20.8 mol Mg I think it would be D

asked by Drew on November 10, 2012
47. ## Physics

Consider three conducting spheres each 10 cm in diameter. “A” has a net charge of 5 C, “B” has a net charge of 10 C, and “C” has a net charge of zero, but is placed in an electric field of 1000 V/m. Rank the electric field strength inside the

asked by Beth on June 13, 2012
48. ## Physics

I don't know how to go about this question. We only have an initial velocity and no final velocity, distance or time. A proton is fired from far away toward the nucleus of a mercury atom. Mercury is element number 80, and the diameter of the nucleus is

asked by Thano on February 27, 2016
49. ## Physics II

A large cylindrical water tank 11.5 m in diameter and 13.5 m tall is supported 8.75 m above the ground by a stand. The water level in the tank is 10.6 m deep. The density of the water in the tank is 1.00 g/cm3. A very small hole is formed at the base of

asked by Lindsay on January 18, 2015
50. ## Physics

(Image included with problem) 9.186E-1 moles of an ideal diatomic gas undergoes a transition from a to c along the diagonal path in the figure. The temperature of the gas at point a is 1310 K. During the transition, what is the change in internal energy of

asked by Anonymous on April 19, 2015
51. ## geometry

word problem You and 3 friends order a 24 in pizza (the diameter is 24 inches) what is the area of the pizza? Round to the nearest tenth. If you and 3 friends spit the pizza evenly, how much do you get to eat? What is total area? and what is your area? for

asked by marko on May 6, 2012
52. ## Chemistry

an ideal system absorbed some amount of heat and gas expand and the piston move to 0.4 meter against than the atmospheric pressure. If the cross sectional area of the container is 0.6 meter2. What is the amount of heat absorbed?

53. ## Chemistry

A meteorological balloon contains 237. L of helium at 33. °C and 0.832 atm. If the volume of the balloon can vary according to external conditions, what volume would it occupy at an altitude at which the temperature is -57. °C and the pressure is 0.094

asked by Anna on November 1, 2014
54. ## Physics

In a certain process, 2.11x10^5 J of heat are supplied to a system and at the same time, the system expands against a constant external pressure of 6.89x10^5 Pa. Given that the temperature of the system does not change, find the increase in volume of the

asked by Lindsay on March 26, 2008
55. ## physics

One gram of water changes from liquid to solid at a constant pressure of one atmosphere and a constant temperature of 0°C. In the process, the volume changes from 0.90 cm3 to 1.10 cm3. The work done by the water is .02J, but I'm not sure how to find the

asked by Rob on November 17, 2011
56. ## Chemistry

Fill a balloon with helium gas to a volume of 2.68 L at 23 celsius and 789mmHg. What would the volume of helium if the pressure changes to 632 mmHg but the temperature is unchanged. This is how I solved it V2 = V1 X P1/P2 2.68L X 789/632 = ANSWER V2 =.3.35

asked by LT on October 23, 2007
57. ## Physics

An airplane wing with an average cross sectional area of 10 m^2 experiences a lift force of 5000 N. What is the difference in air pressure, on the average, between the bottom and top of the wing? a. 5000 Pa b. 500 Pa c. 50 Pa d. 50000 Pa e. 10 Pa

asked by Will Burns on January 18, 2013
58. ## Chemistry

How many liters of Cl2 has at a pressure of .950 atm and a temperature of 298K will be collected from the reaction of 25 mL of a .100 M aqueous solution of KMnO4 and an excess of HCI? KMnO4+HCI->MnCl2+Cl2+H2)+KCl

asked by Sara on July 20, 2013
59. ## Physics

youre in a friends pick up truck when it stalls on a hill. you jump out, get nehind the truck and push with all your might 300 newtons. still the truck slowly rolls back down the hill. whats the pressure the truck exerts on you.

asked by Clayton on January 5, 2012
60. ## Chem

Volume of nitrogen gas is 125ml atmospheric pressure is 763mm Hg the water temperature inside the eudiometer is the same as the level of the water in the beaker. Calculate the volume if the nitrogen at STP. P1V1/T1=P2V2/T2

asked by Steve on April 9, 2015
61. ## Physics

The pressure increases by 1.0 x 104 N/m2 for every meter of depth beneath the surface of the ocean. At what depth does the volume of a Pyrex (bulk modulus 2.6 x 1010 N/m2) glass cube, 2.9 x 10-2 m on an edge at the ocean's surface, decrease by 9.5 x 10-10

asked by Anonymous on March 27, 2013
62. ## physics

The pressure increases by 1.0 x 104 N/m2 for every meter of depth beneath the surface of the ocean. At what depth does the volume of a Pyrex (bulk modulus 2.6 x 1010 N/m2) glass cube, 5.6 x 10-2 m on an edge at the ocean's surface, decrease by 3.0 x 10-10

asked by Anonymous on October 30, 2017
63. ## Chemistry

In a constant-pressure calorimetry experiment, a reaction gives off 20.8 kJ of heat. The calorimeter contains 150 g of water, initially at 21.4 degrees Celsius. What is the final temperature of the water? The heat capacity of the calorimeter is negligibly

asked by Megan on October 30, 2014
64. ## Chemistry

Ten kilograms of hydrogen gas are mixed with 355 kg of chlorine in a 0.50 mm^3 drum. The two gases react to produce hydrogen chloride. What is the final pressure in the drum if the final temperature is 60 degrees celcius?

asked by Maria on March 13, 2011
65. ## Physics

An airplane wing with an average cross sectional area of 10 m^2 experiences a lift force of 5000 N. What is the difference in air pressure, on the average, between the bottom and top of the wing? a. 5000 Pa b. 500 Pa c. 50 Pa d. 50000 Pa e. 10 Pa

asked by Will Burns on January 18, 2013
66. ## chemistry

at a given temperature and pressure 20ml of the gas diffuses through a porous membrane in 5 seconds. calculate the volume o carbon dioxide which diffuses in 10 seconds if the vapour density of the gas is 11 a)10√(2) b)20/√(2) c)40√(2) d)10/√(2)

67. ## chem

The normal boiling point of water is 100.00 degrees celsius and the enthalpy of vaporization at this temperature is 40.657kj/mol. What would be the boiling point of water if it were based on a pressure of 1 bar instead of the standard atm?

asked by tomi on November 18, 2008
68. ## Chemistry

Calculate the grams of oxygen gas present in 2.5 L sample kept at 1.66 atm pressure and a temperature of 10 C. - I got 5.72 grams Determine the volume of oxygen gas needed to completely combust 0.202 L of Butane(C4H10). -I got 1.31 L O2. -Thanks

69. ## physics

1. When an ideal gas is expanded adiabatically in volume at constant pressure, the average kinetic energy of the gas molecule: A. Increase B. decreases C. Does no change i know the answer is B but can someone explain why please? i thought it does not

asked by james on February 9, 2013
70. ## health supports

blood flow is maintained in the veins by? A.blood pressure B.valves in the veins which prevent back-flow C.muscular pumping action of the vein walls D.partial vacuum in the heart my answer is b

asked by susue on July 17, 2013
71. ## Chemistry

A 1.30-L sample of argon gas is at 1.02 atm and 21.5 degrees Celsius. a. what mass of argon is in the container. b. If the temperature is raised to 500 degrees celsius while the volume remains constant, calculate the new pressure, in stmospheres.

asked by Dee on November 9, 2012
72. ## English Pls Writeacher Help me by checking my work

Please replace the incorrect words with correct words in the following sentences using AP Style. There may be more than one error per sentence; all sentences contain at least one error. Use correct AP style, punctuation, grammar and spelling errors.) 1.

asked by Mary on June 10, 2013
73. ## Geometry check my answer?

The diameter of a car tire is approximately 0.6meters. The warranty is good for 70,000 km. About how many revolutions will the tire make before the warranty is up? More than a million? a billion? ----------------------- my work c=pi*d c=3.14*0.6 c=1.884

asked by Skye on January 23, 2011
74. ## Physics

The water flowing through a 1.9 cm (inside diameter) pipe flows out through three 1.3 cm pipes. (a) If the flow rates in the three smaller pipes are 24, 18, and 13 L/min, what is the flow rate in the 1.9 cm pipe? (b) What is the ratio of the speed of water

asked by Shawna on January 11, 2010
75. ## physics

Planet Z is 1.00×10^4 km in diameter. The free-fall acceleration on Planet Z is 10.0 m/s^2. a)What is the mass of Planet Z? b)What is the free-fall acceleration 9000 km above Planet Z's north pole?

asked by kelly on December 1, 2009
76. ## physics

A ball of mass 0.4 kg, initially at rest, is kicked directly toward a fence from a point 20 m away, as shown below. The velocity of the ball as it leaves the kicker’s foot is 18 m/s at angle of 35 degrees above the horizontal. The top of the fence is 4 m

asked by jes on October 19, 2011
77. ## 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
78. ## math

When baking a cake, you have a choice of the following pans: -a round cake pan that is 2 inches deep and has a 7 inch diameter. -a 6 inch * 9 inch rectangular pan that is 2 inches deep. Which of these pans has the larger volume? Justify your answer.

asked by todoroki on May 13, 2019
79. ## Math

A cylindrical swimming pool has a diameter of 16 feet and a height of 4 feet. About how many gallons of water can the pool contain? Round your answer to the nearest whole number. (1 ft³ ≈ 7.5 gal) To the nearest whole number, the pool can hold gallons

asked by Bob on April 5, 2019
80. ## FLUID MECHANICS

Water at temperature of 15°C flows through a pipe of diameter D = 2 cm and into a glass. Determine i. The minimum time taken to fill in a 0.5 L glass full with water if the flow in the pipe is to be laminar. ii. The maximum time taken to fill the glass if

asked by ANNA on May 3, 2014
81. ## Differential Calculus

From a faucet, a constant inflow of water is to fill a conical vessel 15 feet deep and 7.5 feet in diameter at the top. water is rising at the rate of 2 feet per minute when the water is 4 feet deep. what is the rate of inflow in ft^3/min?

asked by Patricia on May 18, 2016
82. ## Chem

Some ethylene glycol, HOCH2CH2OH, is added to your car's cooling system along with 4.4 kg of water. If the freezing point of the water-glycol solution is -15.0°C, how many grams of HOCH2CH2OH must have been added? I used the equation: 15 celcius = 1 x

asked by Mark on March 23, 2011
83. ## Geometry

Need help please: (3,0) (7,6) (x-7)2 + (y-6)2 = 7(2) (x-7)2 + (y-6)2 = 49 Having difficulty with this problem.Can someone help? geometry - Reiny, Saturday, March 31, 2012 at 8:07am You don't say what the actual problem is. I see the resemblance to finding

asked by Kel on March 31, 2012
84. ## College physics

Two 2.4 cm diameter disks spaced 1.5 mm apart form a parallel-plate capacitor. The electric field between the disks is 4.3×10^5 V/m. What is the voltage across the capacitor? How much charge is on each disk? An electron is launched from the negative

asked by Emoni on July 14, 2010
85. ## Geometry

Need help please: (3,0) (7,6) (x-7)2 + (y-6)2 = 7(2) (x-7)2 + (y-6)2 = 49 Having difficulty with this problem.Can someone help? geometry - Reiny, Saturday, March 31, 2012 at 8:07am You don't say what the actual problem is. I see the resemblance to finding

asked by Kel on March 31, 2012
86. ## Chemistry!

A sealed flask contains 0.60 g of water at 28 degrees celcius. The vapor pressure of water at this temperature is 28.36 mmHg. What is the minimum volume of the flask in order that no liquid water be present in the flask?

asked by BillNyeTheScienceGuy on December 6, 2010
87. ## Chem

If you need to prepare 250.0 mL of a pH 5.00 buffer tha t has a total buffer concentration of acetic acid + sodium acetate of 0.050 M, how many moles of each will you need to prepare the solution? Given solutions of acetic acid and sodium acetate with

asked by Nathaly on March 19, 2017
88. ## Chemistry

How many moles of H2PO4 and HPO4 would be needed to prepare 1.0 L of a 0.01M phosphate buffer with a pH of 6.82? Use the Henderson-Hasselbalch equation. pH = pKa + log (base)/(acid). Thank you, but I guess what my question should have been is what is the

asked by Daniel on September 5, 2012
89. ## chem

If a student needs to prepare 50g of bromobenzene and expects no more than a 75% yieldl, how much benzene should the student begin with if the yield is 75%? C6H6(l)+ Br2(l) --> C6H5Br(l)+ HBr(g) I calculated the moles of C6H5Br as .3185. But ion the end my

asked by Sindy on October 8, 2009
90. ## Science

A vitamin C tablet was dissolved in 50.0 mL of water. The resulting solution was titrated to the equivalence point with 28.5 mL of 0.100 M I3− solution. What is the starting mass of the tablet assuming the tablet is 100% vitamin C? I found the moles in

asked by Clay on September 21, 2015
91. ## Chem II

Which of the follwoing gives the molarity of 17.0% by mass solution of sodium acetate (molar mass = 82.0 g/mol) in water. The density of the solution is 1.09 g/mL. OK - I know that to figure molarity is moles divided by liters. This is confusing me because

asked by Ken on June 4, 2008
92. ## Chemistry

The molar mass of an organic acid was determined by the following study of its barium salt. 4.290 g of the salt were to be converted to the free acid by reaction with 21.64 mL of 0.477 M H2SO4. The barium salt was known to contain 2 moles water of

asked by Allysa on June 4, 2017
93. ## Chemistry

Hydrogen gas,H2 , reacts with nitrogen gas,N2 , to form ammonia gas,NH3 , according to the equation 3H2+N2-2NH3 How many grams ofNH3 can be produced from 2.90mol ofN2 ? How many grams ofH2 are needed to produce 13.75g of NH3 ? How many molecules (not

asked by Rose on October 5, 2009
94. ## Chemistry

If each balloon is filled with carbon dioxide gas at 20 degrees C and 1 atmosphere, calculate the mass and the number of moles of carbon dioxide in each balloon at maximum inflation. Use the ideal gas law in your calculation. The volume of the balloon at

asked by Cindy Avalos on January 27, 2016
95. ## chemistry

A 36.1 mL sample of oxygen gas contains 0.529 mol of oxygen. If enough oxygen is added to the sample to obtain a volume of 50.5 mL, what must the final mass of the sample be? (The pressure and temperature is constant.)

asked by Br¥an on September 29, 2014
96. ## Controls

If you have a tank of water at sea level and the temperature of the water in the tank is 110 degrees F, what is the height of the water if the pressure at the bottom of the tank is 95 inches of mercury(absolute)

asked by Kelsey on January 31, 2011
97. ## Chemistry

03 + 3I- + H20 --> O2 + I3^- + 2OH- A 1.00-L bulb of air containing O3 produced by an electric spark was treated with 25mL of 2M KI, shaken well, and left closed for 30 minutes so that all O3 would react. The aqueous solution was then drained from the

asked by Ken on October 24, 2011
98. ## math

In the below figure, EB is tangent to the circle with center \$C\$ at the point B. If EC is equal to the diameter of the circle, find the measure of angle BAD in degrees. and here is the ugly LaTeX [asy] pair C = (0,0), B = dir(110), D = dir(170), E2 = 2 *

asked by halp on August 12, 2017
99. ## math problem

In a standard carnival game, you toss a coin on a table top marked with a grid of squares. You win if the coin lands without touching or overlapping any lines. In other words, the coin needs to land entirely inside one of the squares. If the squares

asked by Anonymous on June 11, 2013
100. ## science

I have been given the task to prove a hypothesis by conducting an experiment. Hypothesis: A candle will burn slower in a cooler environment. Independant variable: Temperature of the room (three temperatures) Dependant variable: Length of the candle after

asked by anonymous on July 26, 2018