# 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 195
1. ## Physics

In an amusement ride, fun seeking people enter a 7.4 meter diameter cylinder and stand up against the wall. The cylinder spins fast enough so that when the bottom drops down 2 meters, the people remain pinned to the wall. The cylinder continues to rotate

asked by Me on October 20, 2011
2. ## Chemistry

The normal freezing point of cyclohexane is 6.55 C. When 0.458 g of benzophenone is dissolved in 15.0 g of cyclohexane, the freezing point is found to be 3.19 C. What is the experimental molar mass of benzophenone? (Kf cyclohexane = 20.0 C m^-1). A) 182 B)

asked by Ania on November 9, 2012
3. ## Chemistry

What is the mole of oxalic acid? Equation:H2C2O4 + 2NaOH---> Na2C2O4 + 2H2O *Moles of oxalic acid dihydrate is 0.032 mole. * Molarity of oxalic acid solution is 0.128 M oxalic acid solution. * Initial volume of Oxalic acid is 19.8 ml and Final volume is

asked by Ivy on December 7, 2010
4. ## college Chemistry

What is the mole of oxalic acid? Equation:H2C2O4 + 2NaOH---> Na2C2O4 + 2H2O *Moles of oxalic acid dihydrate is 0.032 mole. * Molarity of oxalic acid solution is 0.128 M oxalic acid solution. * Initial volume of Oxalic acid is 19.8 ml and Final volume is

asked by Ivy on December 6, 2010
5. ## Chemistry

A 0.65 mole quantity of O2 occupies 4.0 L at 20.◦C. What is the final pressure exerted by the gas? 1. 0.92 atm 2. 3.9 atm 3. 6.2 atm 4. 1.1 atm 5. 0.27 atm — Initially, I got .27 atm. I got this answer by plugging in the values into the equation

asked by Dijames on April 11, 2019
6. ## Chemistry

I don't understand how to answer this questions. I thought molecular weight was adding up the atomic weight of each element in a molecule...? If a 0.614g sample of a gas maintains a pressure of 238 mmHg when contained in a 1.0L flask at 0.0 degree Celcius,

asked by Holly Y. on November 8, 2009
7. ## U.S History

1. How did the muckrakers help spark the Progressive movement? A: The muckrakers investigated social problems and published their findings. The muckrakers' articles led to a general public debate on social and economic problems and put pressure on

asked by Victoria on October 20, 2015
8. ## Physics

Can you please show all your work so that I can understand how the problem is solved? In the Challenger Deep of the Marianas Trench, the depth of water is 10.9 km and the pressure is 1.16 x 10^8 Pa. a) if a cubic meter of sea water is taken from the

asked by Amanda on July 13, 2010
9. ## apchem

A 15.0g sample of liquid ethanol, C2H5OH, absorbs 5.13x10^3 J of heat at its normal boiling point, 78.0C. The molar enthalpy of vaporization of ethanol is 39.3kJ/mol. (a) What volume of ethanol vapor is produced? The voume is measured at 78.0C and 1.00atm

asked by alk on January 27, 2008
10. ## Chemistry

Suppose 33.5 g of ClF3(g) and 29.1 g of Li(s) are mixed and allowed to react at atmospheric pressure and 25 C until one of the reactants is used up, producing LiCl(s) and LiF(s). Using the NIST value for the enthalpy of formation of ClF3

asked by Katie on December 4, 2011
11. ## Chemistry

A 15.0g sample of liquid ethanol, C2H5OH, absorbs 5.13x10^3 J of heat at its normal boiling point, 78.0C. The molar enthalpy of vaporization of ethanol is 39.3kJ/mol. (a) What volume of ethanol vapor is produced? The voume is measured at 78.0C and 1.00atm

asked by David on January 27, 2008

Two speakers are driven by a common oscillator at 870 Hz and face each other at a distance of 1.20 m. Locate the points along a line joining the two speakers where relative minima of pressure amplitude would be expected. (Use v = 343 m/s. Choose one

asked by julie on January 31, 2011
13. ## Thermochemistry

Suppose 23.6 g of ClF3(g) and 40 g of Li(s) are mixed and allowed to react at atmospheric pressure and 25 C until one of the reactants is used up, producing LiCl(s) and LiF(s). Using the NIST value for the enthalpy of formation of ClF3 (webbook.nist.gov),

asked by LaurenB on December 3, 2011
14. ## Chemistry

A vilatile liquid was allowed to evaporate in a 43.298 g flask that has a total volume of 252 ml. The temperature of the water bath was 100 degree Celsius at the atmospheric pressure of 776 torr. The mass of the flask and condensed vapor was 44.173 g.

asked by Linda on April 6, 2011
15. ## physics

1.00L piston with 1.00 mole of an ideal gas at 298.0K and 1.00bar is isothermally and reversibly compressed to a final volume of 0.200L, the irreversibly expanded in first step to its original volume with an applied pressure of 1.00bar. Calculate the

asked by Orbit on March 1, 2017
16. ## Chemistry

If the column of water in the water barometer fore to a height of 35ft, what would the atmospheric pressure be in mm Hg? mmH20X(density of water/density of Hg)= mmHg Density of water=0.99707 Density Hg=13.5340

asked by Brian on February 11, 2011
17. ## calculus

At a temperature of 20°C, the volume V (in liters) of 1.33 g of O2 is related to its pressure p (in atmospheres) by the formula V(p) = 1/p (a) What is the average rate of change of V with respect to p as p increases from p = 7 to p = 8? L/atm (b) What is

asked by Anonymous on February 4, 2011
18. ## chem

6.01-L cylinder contains 1.25 mol of gas A and 4.54 mol of gas B, at a temperature of 32.8 °C. Calculate the partial pressure of each gas in the cylinder. Assume ideal gas I have work this question three time and can not get the rt answer

asked by dinah on December 1, 2013
19. ## chem

What Celsius temperature, T 2 , is required to change the volume of the gas sample in Part A (T 1 = 19 ∘ C , V 1 = 1.47×103L ) to a volume of 2.94×103L ? Assume no change in pressure or the amount of gas in the balloon.

asked by dakota on March 18, 2015
20. ## Math

At a temperature of 20°C, the volume V (in liters) of 1.33 g of O2 is related to its pressure p (in atmospheres) by the formula V(p) = 1/p (a) What is the average rate of change of V with respect to p as p increases from p = 7 to p = 8? L/atm (b) What is

asked by Anonymous on February 4, 2011
21. ## Chemistry

At standard temperature, a gas has a volume of 275mL. The temperature is then increased to 130. Celcius, and the pressure is held constant. What is the new volume? How do I work this? v1 = 275mL t1 = 130. C or 403K v2=??? t2 = ??? Can someone help me

asked by Chopsticks on March 19, 2009
22. ## chem

6.01-L cylinder contains 1.25 mol of gas A and 4.54 mol of gas B, at a temperature of 32.8 °C. Calculate the partial pressure of each gas in the cylinder. Assume ideal gas I have work this question three time and can not get the rt answer

asked by dinah on December 1, 2013
23. ## Chemistry

A gas mixture with a total pressure of 750 mmHg contains each of the following gases at the indicated partial pressures: , 265 mmHg; Ar 134 mmHg; and ,O2 157 mmHg; The mixture also contains helium gas.

asked by Lisa on November 9, 2010
24. ## Chemistry

It is known that 1.0 L of nitrogen gas reacts with 3.0 L estequilometricamente gas ...? Edit Hydrogen to form 2.0 L of ammonia gas in the same conditions of pressure and temperature. a)What is the final volume of gas? b)5.0 L of N2 + 9.0 L H2. What final

asked by Anonymous on February 12, 2016
25. ## physics

A potter's wheel is rotating around a vertical axis through its center at a frequency of 1.8rev/s . The wheel can be considered a uniform disk of mass 4.7kg and diameter 0.34m . The potter then throws a 3.1kg chunk of clay, approximately shaped as a flat

asked by Joe on March 17, 2014
26. ## Physics/Calculus

At a county fair, a boy and two friends bring their teddy bears on the giant Ferris wheel. The wheel has a diameter of 14.8 m, the bottom of the wheel is 1.8 m above the ground and its rim is moving at a speed of 1.0 m/s. The boys are seated in positions

asked by Donny on October 14, 2010
27. ## chem

For the reaction 2 N2(g) + 3 H2(g) → 2 NH3(g) which of the following can be determined using only the coefficients of the balanced chemical equation? the number of moles of NH3 obtained if 4.2 mol of N2 react completely to form NH3 the weight of NH3

asked by chris on October 16, 2016
28. ## Math

The flask consist of a cylindrical part and a frustum of a cone. The diameter of the base is 10 cm while that of neck is 2 cm. The vertical height of the flask is 12 cm. (a) the slant height of the frustum part; (b) the slant height of the smaller cone

asked by K on March 19, 2018
29. ## Math

The flask consist of a cylindrical part and a frustum of a cone. The diameter of the base is 10 cm while that of neck is 2 cm. The vertical height of the flask is 12 cm. (a) the slant height of the frustum part; (b) the slant height of the smaller cone

asked by M on May 12, 2018
30. ## trigonometry

these two are the same type of questions but i have no clue how to figure out the answer. i have tried drawing it out but don't know what to do after that. 1. a bicycle with a 28-inch wheel(diameter) travels a distance of 800 feet. how many revolutions

asked by y912f on January 7, 2009
31. ## Science/Biology/Physics

1. Giraffes have long necks that allow them to reach more food sources in their habitat. The long neck trait is an example of A. selection. B. adaptation. C. radiation. D. homology. 2. Which of the following is the most common kind of chemical bond in

asked by J on July 23, 2014
32. ## Chemistry

Determine the number of moles of NaCl in the solution. Measured Mass of NaCl: 11.69g Measured Vol of Water: 100mL Molar Mass of NaCL: 58.44g/mol 11.69gNaCL/58.44g/mol = 0.20 mol NaCl Do I then to multiply my answer by 100ml? 0.20 x 100=20.00mol NaCl?

asked by Rose on March 16, 2017
33. ## Chemistry

For this question, I know how to answer the first three questions, but not the rest. 12ml 0.025 M of benzoic acid (Ka=6.3x10-5)is titrated with 0.050 M NaOH. How many moles of benzoic acid are there? I got 0.0003 What volume of NaOH is required?(L) I got

asked by Sara on June 23, 2015
34. ## s

According to science, the fastest speed possible for anything is the speed of light. The speed of light is about 186,000 miles per second. That means that in one minute, light travels 11,160,000 miles. The star nearest Earth is the Sun. It's about

asked by pamela on June 3, 2013

According to science, the fastest speed possible for anything is the speed of light. The speed of light is about 186,000 miles per second. That means that in one minute, light travels 11,160,000 miles. The star nearest Earth is the Sun. It's about

asked by Tazkiyah on March 6, 2014

According to science, the fastest speed possible for anything is the speed of light. The speed of light is about 186,000 miles per second. That means that in one minute, light travels 11,160,000 miles. The star nearest Earth is the Sun. It's about

asked by Anonymous on October 19, 2012
37. ## chemistry

A 275 mL sample of 1-propylamine vapor (in equilibrium with the liquid) at 25 °C is removed and dissolved in 0.500 L of H2O. For 1-propylamine, Kb = 3.72 x 10-4 and the vapor pressure at 25.0 °C is 316 Torr. a. What should be the pH of the aqueous

asked by Andreea Grigore on March 15, 2017
38. ## chemistry

If a cetain pressure supports a 256 mm high column of mercury, how high a column of water will it support? The ensity of mercury is 13.6 g/mL. Not completely sure how to work this one, we never reviewed it in class. All the answers to chose from are in

asked by lavonne on October 20, 2010
39. ## NEED HELP WITH CHEM HW

Ethanol (C2H5OH) is synthesized for industrial use by the following reaction, carried out at very high pressure. C2H4(g) + H2O(g) C2H5OH(l) What is the maximum amount of ethanol (in grams) that can be produced when 2.2 kg of ethylene (C2H4) and 0.014 kg of

asked by Anonymous on October 1, 2011
40. ## physics

Objects deep beneath the surface of the ocean are subjected to extremely high pressures. Some bacteria in these environments have adapted to pressures as much as a thousand times atmospheric pressure. How might such bacteria be affected if they were

asked by Alex on March 4, 2017
41. ## Physics P

8.31 Wh (watthours) heat is transmitted to 1 mole single atomic ideal gas. The gas temperature is 27Â°C and the pressure is constant during the process (slow process). What is the temperature? What is the change of the internal energy of the gas? What is

asked by Buma on October 23, 2017
42. ## Science

The effect _______ explains how fast air moves across a surface, the ____ pressure that presses on that surface. In contrast, the more ____ that air moves, the more of _____ there will be. I'm sorry that it might not make sense, I translated it from

asked by Alex on April 21, 2015
43. ## Chemistry

What happens to these physical properties as the strength of intermolecular forces increases? My answers are there as well but its not correct Increase or decrease? a) melting point - increases b) vapor pressure-increases c) boiling point- increases d)

asked by Saira on May 11, 2009
44. ## physics

An rectangular above-ground swimming pool is 9 m long and 4 m wide. The pool wall has a constant height of 3 m above the ground. Take atmospheric pressure to be 1 atm = 105 Pa and g = 10 m/s2. (a) Calculate the weight of the air that fills the pool when

asked by kelly on March 20, 2011
45. ## chemistry

a 275mL sample of vapor in equilibrium with 1-propylamine at 25C is removed and dissolved in 0.500L of H20. For 1-propalamine, Kb=3.72*10^-4 and the vapor pressure at 25C is 215 torr. (a)What should be the pH of the aqueous solution? (b) How many mg of

asked by kate on March 22, 2011
46. ## Chemistry

2) Given the balanced reaction equation predict the moles of each product given the following reactants: AlCl3 + 3 NaHCO3 Al(OH)3 + 3 NaCl + 3 CO2 AlCl3 NaHCO3 Al(OH)3 NaCl 58.4 CO2 a 1 mol 1 mol ? ? b 1 mol 3 mol ? ? c 3 mol 1 mol ? ?

asked by Selina on March 16, 2014
47. ## Physics

A piece of putty is initially located at point A on the rim of a grinding wheel rotating about a horizontal axis. The putty is dislodged from point A when the diameter through A is horizontal. The putty then rises vertically and returns to A the instant

asked by Jessi on February 17, 2009
48. ## Plz Check my Geometry(sOo0n)

Out of 31 questions these are ones I struggled with. after the = sign is what I think the answer( except for #4, I don't know what to do at all), is so if I'm wrong can someone correct it with an explanation/formula with it please? 1.) Find the area of the

asked by Ariel on June 10, 2010
49. ## Plz Check my Geometry(sOo0n)

Out of 31 questions these are ones I struggled with. after the = sign is what I think the answer( except for #4, I don't know what to do at all), is so if I'm wrong can someone correct it with an explanation/formula with it please? 1.) Find the area of the

asked by Ariel on June 10, 2010

Hi, I really need help with this. I'm asked to write a paragraph about this. I just need some help working it out so I can get everything correct. I'm not cheating its just confusing this part of the assignment for me. So please help! I also have to study

asked by Music Lover 14 on April 11, 2016
51. ## chemistry homework help!!

Calcium Hydride reacts with water to produce hydrogen gas: CaH2(s) + H2O (l)---> Ca(OH)2 (aq) + H2 This reaction is sometimes used to inflate life rafts, weather balloons, and the like, where a simple, compact means of generating H2 is desired. How many

asked by danielle on February 16, 2012
52. ## physical education

Your training partner has stopped pedaling during the spinning class you are both taking. She wants to check her exercise intensity level. You have a piece of exercise technology for this job and can continue to pedal while keeping tabs on your workout

asked by Eugene on January 9, 2014
53. ## chemistry

Consider the combustion of glucose: C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(g) H = −3 kJ/mol Which condition I) Adding more carbon dioxide; II) Performing the reaction in a hotter environment; III) Decreasing the pressure of the system; IV) Adding a reagent

asked by luke on April 3, 2012
54. ## Chemistry

Determine the unknown quantity in the following cell at 298.15 K. Pt(s) | H2(g, 1.0 bar)| H+(pH = ?) || Cl -(aq, 1.0 mol·L-1) |AgCl(s), Ag(s), ΔE = +0.36 V. (DrBob) I still wasn't able to figure out the other one--I posted again after that one, but I

asked by Val on March 29, 2010
55. ## chemistry

phsophorous trichloride and phosphorous pentachloride equilibrate in the presence of molecular chlorine according to PCl3 (g) +Cl2 (g)->PCl5 (g) Kc = 2.01 at 500k If a 1.000L reaction vessel is charged with .300 mol of PCl5(g) and allowed to equilibrate at

asked by james on October 1, 2015
56. ## chemistry

I would really like help for this question ASAP! pleasee! I thank you ahead of time. The question refers to an experiment using equal volumes of O2 gas and three other gases "X", "Y", "Z", at the same temperature and pressure. If the respective masses are:

asked by md. on June 9, 2011
57. ## chemistry

I would really like help for this question ASAP! pleasee! I thank you ahead of time. The question refers to an experiment using equal volumes of O2 gas and three other gases "X", "Y", "Z", at the same temperature and pressure. If the respective masses are:

asked by md. on June 9, 2011
58. ## math

a large elm tree died after it was struck by lightning.the property owner thinks he can remove it himself,but is concerned that it will fall on his greenhouse.he takes several measurement before attempting to cut it down.at 3 p.m. he measures the shadow of

59. ## Pre Calculus 12

Modelling with sine/cosine A Ferris wheel has a diameter of 30m. The bottom of the wheel is 1.5m off the ground it takes 3.5min to make one complete revolution. a person gets on ferris wheel at its lowest point at time = 0. write an equation that

asked by Shreya on January 23, 2013
60. ## Pure Maths

A container is in the shape of a right circular cone (inverted) with both height and diameter 2 meters. It is being filled with water at a rate of (pi)m^3 per minute. Fine the rate of change of height h of water when the container is 1/8th full(by volume).

asked by Ariana on August 16, 2014
61. ## Physics

1) Suppose that you wish to fabricate a uniform wire out of 1.15 g of copper. Assume the wire has a resistance R = 0.600 , and all of the copper is used. (a) What will be the length of the wire? m? (b) What will be the diameter of the wire? µm? 2) A

asked by Tommy on October 4, 2010
62. ## Physics

1) Suppose that you wish to fabricate a uniform wire out of 1.15 g of copper. Assume the wire has a resistance R = 0.600 , and all of the copper is used. (a) What will be the length of the wire? m? (b) What will be the diameter of the wire? µm? 2) A

asked by Max on October 4, 2010
63. ## Chemistry

I keep getting the wrong answer? I know there is one similar to this on here but I keep getting the wrong answer. The gold foil Rutherford used in his scattering experiment had a thickness of approximately 6×10^−3mm. If a single gold atom has a diameter

asked by Rach on September 16, 2015
64. ## chemistry

Given: hexane- -density at 25 degrees Celsius (.660g/ml) -Vapor pressure of pure substance at 25 degrees Celsius (150 torr) -heat if vaporization (21.0 kj/mol) -55 mL What mass of hexane vaporizes at 25 degrees Celsius?

asked by Elizabeth on February 8, 2011
65. ## Physics

The density of a fresh water is 1000 kg/m^3 a 12 cm side cube is submerged to a depth of 30 cm 1-cauculate the pressure at:a-the bottom surface of the cube B-the top surface of the cube 2-calculate the force entered by water on each surface

asked by Omaro on January 29, 2013
66. ## Physics

The density of a fresh water is 1000 kg/m^3 a 12 cm side cube is submerged to a depth of 30 cm 1-cauculate the pressure at:a-the bottom surface of the cube B-the top surface of the cube 2-calculate the force entered by water on each surface

asked by Omaro on January 29, 2013
67. ## Statistics

You are a real estate agent and you are trying to predict home prices for your clients that want to list their house for sale. You have a very small city without much data. You will need to use the data that you have available for the past year on homes

asked by Kathryn on June 2, 2013
68. ## Geometry Ms. Sue help please?

Ms. Sue, can you help me again? you replied to my question but i still need a bit of help Small Pizza- radius 6 in. cost \$9.75 Medium- radius 8in cost \$12 Large-diameter 20 in cost \$16.50 The edge is stuffed with cheese, and its the best part of the pizza/

asked by Skye on January 24, 2011
69. ## physics

A coin with a diameter of 1.9 cm is dropped on edge onto a horizontal surface. The coin starts out with an initial angular speed of 19 rad/s and rolls in a straight line without slipping. The rotation slows with an angular acceleration of magnitude 2.1

asked by help on September 27, 2010
70. ## chemistry

If 8.29 L of gaseous Cl2 measured at STP and 0.380 mol of liquid CS2 are reacted stoichiometrically according to the balanced equation, how many moles of liquid CS2 remain? CS2(l) + 3Cl2(g) ¡æ CCl4(l) + S2Cl2(l) Molar Mass (g/mol) Cl2 70.906 CS2 76.143

asked by Judy on June 2, 2010
71. ## geometry

a cylinder water tower is three-fourths full of water.the tower is 24 feet tall and has a diameter of 28 feet.how much water is in the tower now? CAN SOMEONE PLZ PLZ PLZ HELP ME

asked by yuku on February 24, 2010
72. ## Chemistry

3H2(g)+N2(g)=2NH3(g) Suppose the equilibrium constant Kp = 0.003337 for the reaction above. If the equilibrium mixture contains partial pressures H2 = 0.400 atm and N2 = 0.350 atm. What is the equilibrium partial pressure of NH3 in atm?

asked by Tiffany on September 23, 2010
73. ## chem

Calcium metal and water produce hydrogen gas. If the volume of wet gas collected over water is 95.0 mL at 20 °C and 758 mm Hg, what is the volume of dry gas at STP conditions? (The vapor pressure of water at 20 °C is 17.5 mm Hg.)

asked by nurse on April 3, 2013
74. ## chemistry

If 10L each of propane and oxygen are combined at the same temperature and pressure, which gas will be left over after reaction? What volume of that gas will remain? The answer is 8 L of Propane Tried for a while but I don't understand how answer books

asked by od on April 7, 2012
75. ## Physics

In a design for a piece of medical apparatus, you need a material that is easily compressed when a pressure is applied to it. Would this material have a large bulk modulus, small bulk modulus, or is the bulk modulus not relevant to this situation?

asked by Marie on November 13, 2007
76. ## chemistry

Br2 + Cl2 ----> 2BrCl all estequiometicas con respecto a Cl2? cuantos moles de Cl2 se necesitan para formar 55g de BrCl? cuantos gramos de Br2 se necesitan para formar 38G de BrCl? Gracias,

asked by leslie on March 4, 2011
77. ## Chemistry

Calculate the molarity of Fe(NO3)3 in Solution A. Solution A: Mass of Fe(NO3)3 solid: 1.21g & Vol of Solution: 100mL In a previous ? Using the mass I weighed 404.0g/mol to calculate moles of Fe(NO3)3 in solid hydrate----I got 0.00300 mol Fe(NO3)3)

asked by Rosie on October 17, 2016
78. ## Physics

Spiderman is standing on the edge of a rooftop 100m above a swimming pool. He decides to jump in to cool off, so he springs out at a velocity of 30 m/s at an angle of 35 degrees above the horizontal. The near edge pool is located 127 m from the base of the

asked by Jamie on October 13, 2014
79. ## Physics

A beam of singly ionized carbon atoms (C-12, C-13, and C-14 isotopes) is injected into a mass spectrometer, which isotopes would follow the trajectory of greatest diameter and strike the detection plate furthest? I know the answer is C-14, but why? can

asked by ricky on March 28, 2018
80. ## Science/maths

what are some problems you might encounter when a)finding the volume of a rugby ball b)finding the diameter of a tennis ball c) finding the mass of a grain of sugar can you help me then I help you please w/b a) submerge it in water in a graduated container

asked by San on March 3, 2007
81. ## 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
82. ## thermodynamics (dont know what to do)

0.05 kg of carbon dioxide (molecular weight = 44) is compressed from 1 bar, 15°C, until the pressure is 8.3 bar, and the volume is then 0.004 m3. Calculate the change of entropy. Take cp for carbon dioxide as 1.0 kJ/kg K, and assume carbon dioxide to be a

83. ## Chemistry

A toy balloon originally held 1.00 g of helium gas and had a radius of 10.0 cm. During the night, 0.25 g of the gas effused from the balloon. Assuming ideal gas behavior under these constant pressure and temperature conditions, what was the radius of the

asked by Dia B on September 12, 2012
84. ## Physics: Angular Width. Why is my answer wrong?

A beam of yellow laser light (590 nm) passes through a circular aperture of diameter 5.0 mm. What is the angular width of the central diffraction maximum formed on a screen? I can't seem to get this answer right. I don't think I am finding the first part

asked by Sar on November 9, 2010
85. ## math --- can someone help me pls?

can anyone help me with these 2 questions pls? Calculate the slant height for the given cone. Round to the nearest tenth. (1 point) Diameter = 8 Height = 9 10.2 cm 11.4 cm 9.8 cm 12.0 cm Calculate the length of the diagonal for the given rectangular prism.

asked by TTR+S<3 on February 26, 2014
86. ## Physics

A merry-go-round is a common piece of playground equipment. A 2.4 m diameter merry-go-round with a mass of 300 kg is spinning at 22 rpm. John runs tangent to the merry-go-round at 5.0 m/s, in the same direction that it is turning, and jumps onto the outer

asked by Danny on December 2, 2011
87. ## Mathematics

The points scored in a basketball game by the individual players of two teams, High Rangers and Rising Stars, is recorded during the game. After the game, the manager found that the range for the High Rangers is 20 points and the range for the Rising Stars

asked by Nikki on February 7, 2016
88. ## Physics

A particle travels counterclockwise around the origin at constant speed in a circular path that has a diameter of 2.50 m, going around twice per second. Point Q is on the path halfway between points P and R, which lie on the x axis and the y axis,

asked by Rachel on May 25, 2012
89. ## math

A truck has 5.9L engine in it. 5.9L of the overall displacement in 6 cylinders each 102mm bore (diameter) and 120mm stroke (length). Engine operates at 16.3:1 compression ratio and with 6psi (0.41atm) of boost cruising at 1600rpm. What is the volume of ONE

asked by Greg on May 4, 2014
90. ## Astronomy

A roughly spherical asteroid with a diameter of 1 km, and a mean density of 4 g/cm^3, hits the Earth with a relative speed 1.5 times the orbital velocity of the Earth. Compute the amount of energy released upon the impact. Compare that with the energy

asked by qwerty on April 25, 2014
91. ## math

Please double check In a bottling company, a machine can fill a 2-liter (l) bottle in 0.5 second (s) and move the next bottle into place in 0.1 s. How many 2-l bottles can be filled by the machine in 2 h? Answer: 1.00 or 0.20 A circular coffee table has a

asked by Ray on February 20, 2008
92. ## Chemistry

Element X and fluorine react to form two different compounds. In the first reaction 0.480g of X reacts with 1.000g of F. In the second, 0.960g of X reacts with 1.000g of F. What are the possible formulas for the two compounds? (Multiple choice) a. XF (for

asked by Paul on July 25, 2005
93. ## Chemistry

the following questions are about colligative properties: a)How much would the freezing point change in a 2.5 solution of phenol in benzene? b)how much would the boiling point change in a 1.m solution of magnesium chloride in ethanol? c)Does adding sugar

asked by Kim on May 2, 2010
94. ## thermodynamics

A scuba tank contains 1.5 kg. of air. The air in the tank is initially at 15 degree celcius. The tank is left near an engine exhaust line, and the tank's pressure doubles. Determine the final temperature, change of internal energy, change of enthalpy, and

asked by hermie on November 29, 2011
95. ## chemistry

Sodium carbonate, Na2CO3(s), can be prepared by heating sodium bicarbonate, NaHCO3(s). 2NaHCO3(s) Na2CO3(s) + CO2(g) + H2O(g) Kp = 0.23 at 100ºC If a sample of NaHCO3 is placed in an evacuated flask and allowed to achieve equilibrium at 100ºC, what will

asked by wael on July 10, 2012
96. ## Chemistry

Calculate the entropy change when 2.42 g of H2 reacts with O2 according to the reaction 2 H2(g) + O2(g) → 2 H2O(ℓ) at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(ℓ) at 298 K is −285.8 kJ/mol. The corresponding free

asked by Austin on October 14, 2012
97. ## Chemistry

Calculate the entropy change when 2.42 g of H2 reacts with O2 according to the reaction 2 H2(g) + O2(g) → 2 H2O(ℓ) at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(ℓ) at 298 K is −285.8 kJ/mol. The corresponding free

asked by sam on October 14, 2012
98. ## Chemistry

srry I placed the question in the wrong spot. The equation is 2NH3 N2 + 3H2 1 mole of NH3 injected intoa 1L flask 0.3 moles of H2 was found the concentration of N2 at equlibrium is 0.1M how do I find the concentration of NH3 at equlibrium? (N2) = 0.1 (H2)

asked by Bethany on May 8, 2007
99. ## Physics - Matter

Wind blows around a skyscraper with a speed of 18 m/s outside a large pane of plate glass. What is the difference in air pressure between the inside and outside of the skyscraper? Take the density of air to be 1.3 kg/m3 and assume the air inside the