1. chemistry

    How many grams of Nitric oxide are required to produce 145g of nitrogen in this reaction: Al2O3(s)+6NO(g)---->5N2(g)+6H2o(l)

    asked by mandy on November 17, 2011
  2. Chermistry

    if molar enthalpy of vaporization of enthanol is 38.6 kJ/mol, how many moles of ethanol are vaporize when required heat is 200.72kJ

    asked by Paris on August 31, 2010
  3. Chemistry

    Assume that you found that the average volume of water required to fill the graduated cylinder to the 8.00 mL mark was 7.95 mL. What is the percent error?

    asked by Andrew Howard on January 27, 2010
  4. Physics

    An 8.3 uF and a 2.9 uF capacitor are connected in series across a 24 V battery. What voltage is required to charge a parallel combination of the two capacitors to the same total energy?

    asked by Anonymous on October 16, 2013
  5. Physics

    An 8.3 uF and a 2.9 uF capacitor are connected in series across a 24 V battery. What voltage is required to charge a parallel combination of the two capacitors to the same total energy?

    asked by Anonymous on October 16, 2013
  6. Trigonometry

    Minimum force required to prevent a ball weighing 29.6 pounds from rolling down a ramp which is inclined 14.9 degrees with the horizon?

    asked by Casey Lewis on December 7, 2010
  7. Physics

    An 8.3 uF and a 2.9 uF capacitor are connected in series across a 24 V battery. What voltage is required to charge a parallel combination of the two capacitors to the same total energy?

    asked by Anonymous on October 17, 2013
  8. physics

    A robot arm expends 15J of work to extend a spring 10cm from its equilibrium position. How much force is required?

    asked by Leah on November 30, 2014
  9. Math

    Hi, thanks for help in advance. Using the Equation: f(w) = 10/w - 0.77ln(w) – 3.2 How do i use Newton-Raphson iterative to find the required value of w correct to 3 significant figures, starting from w0 = 3. Thanks

    asked by Connor on February 15, 2015
  10. spanish

    replace the underlined objects with the correct object pronoun . be sure to use se when it is required 1/ ayer mi mama compro un lapiz para mi

    asked by ally on February 15, 2015
  11. physics

    The coefficient of kinetic friction for a 22 kg bobsled on a track is 0.20. What force is required to push it down a 6.0° incline and achieve a speed of 70 km/h at the end of 75 m?

    asked by jen on December 8, 2010
  12. chemistry

    Al2O3(s)+6NO(g)---->5N2(g)+6H2O(l) how many grams of Nitric Oxide are required to produce 145g of nitrogen in the following reaction?

    asked by Mandy on February 28, 2012
  13. Chem

    I need help setting this up, please. What is the specific heat of a substance if 1560 cal are required to raise the temperature of a 312–g sample by 15ºC

    asked by Kay on May 27, 2009
  14. physics

    The coefficient of kinetic friction for a 22 kg bobsled on a track is 0.20. What force is required to push it down a 6.0° incline and achieve a speed of 64 km/h at the end of 75 m?

    asked by gen on December 2, 2013
  15. Physics

    What is the centripetal force required to cause a 4000 lb car to go around a curve of 900 ft radius and a speed of 600 miles per hour?

    asked by Ked on September 19, 2014
  16. physics

    Calculate the work required to lift a 20kg object from the floor to a height of 2 meters. Give your answer in Joules

    asked by Darcie on February 26, 2012
  17. Science

    How many minutes are required for a radio signal to travel from Earth to a space station on Mars if Mare is 7.83 x 10 to the 7th power km?

    asked by Margaret on October 8, 2012
  18. Chemistry

    I don't know how to set up this problem...can you help? How many milliliters of 6.00M HCl are required to react with 150 mL of 1.48 M Al(OH)3? Al(OH)3+3HCl to AlCl3 + 3H2O

    asked by Nicole on October 5, 2011
  19. physics

    A ball has a diameter of 3.86 cm and average density of 0.0836 g/cm3. What force is required to hold it completely submerged under water?

    asked by jim on November 21, 2011
  20. Trigonometry

    Minimum force required to prevent a ball weighing 29.6 pounds from rolling down a ramp which is inclined 14.9 degrees with the horizon?

    asked by Casey Lewis on December 7, 2010
  21. physics (urgent)

    A flywheel with a moment of inertia of 1.00kg m^2 is rotating at 100 rpm. What torque is required to bring it to rest in 10.0 revolutions?

    asked by paul on November 5, 2016
  22. programming

    I need to do this but I don't know how to start! I'm so bad a this class, and I'm just taking it because is a required! Please help! Write an algorithm that solves tax calculation problem.

    asked by HELP!!! on October 16, 2011
  23. physics help

    A flywheel turns through 32 rev as it slows from an angular speed of 2.1 rad/s to a stop. How much time is required for it to complete the first 16 of the 32 revolutions?

    asked by stanely on April 8, 2010
  24. stoichiometry

    How many grams of Nitric oxide are required to produce 145g of nitrogen in this reaction: Al2O3(s)+6NO(g)---->5N2(g)+6H2o(l)

    asked by mandy on November 17, 2011
  25. mgmt 303

    some people have claimed that the increasing technological sophistication required by many of today's corporations has led to a return to job specialization.

    asked by larry on September 20, 2010
  26. Physics

    A flywheel turns through 60 rev as it slows from an angular speed of 2.8 rad/s to a stop. How much time is required for it to complete the first 30 of the 60 revolutions?

    asked by Sara on March 7, 2017
  27. Chemistry

    Calculate the grams of solute required to make the following solutions. a)2500g of saline solution (0.90% NaCl (m/m)) b)0.050kg of 4.0% (m/m) MgCl2

    asked by Kim on April 27, 2010
  28. chemistry

    4FeCr2O4+ 8K2CO3+7O2= 2Fe2O3+8K2CrO4+8CO2 how many grams of FeCr2O3 are required to produce 44g of CO2?

    asked by henry on January 25, 2010
  29. Chemistry

    For the reaction HCl + NaOH → NaCl + H2O, how many moles of hydrochloric acid are required to produce 281.0 g of water?

    asked by Andrew on October 31, 2016
  30. physics

    A basketball is thrown at 45° to the horizontal. The hoop is located 4.4 m away horizontally at a height of 1.1 m above the point of release. What is the required initial speed?

    asked by anna on September 27, 2014
  31. Math

    Find the angel in degrees required to shoot a cannon a distance of 200 yards. It's speed is 400 mps.

    asked by Jose on December 4, 2013
  32. physics

    A uniform chain 10m long and weighing 6 kg permetre hangs vertically.calculate the work required to wind it up

    asked by vishal on October 14, 2011
  33. College Physics

    Find the minimum work required to carry a truckload of furniture weighing 1.99 104 N to a third-story apartment, 24.0 m above the truck.

    asked by Allen on October 14, 2011
  34. Physics

    A flywheel with a moment of inertia of 1.00kg m^2 is rotating at 100 rpm. What torque is required to bring it to rest in 10.0 revolutions?

    asked by Tyrese on November 4, 2016
  35. statistics

    A group of scientists is studying whether a new medical treatment has an adverse (bad) effect on lung function. Here are data on a simple random sample of 10 patients taken from a large population of patients in the study. Both variables are measurements,

    asked by Anonymous on August 17, 2013
  36. science Please Help

    1. A positively charged test object is moving toward the positive source charge in an electric field. What happens next??? A. its potential energy decreases. B. Its potential energy increases. C. Its potential energy stays the same. D. Its potential energy

    asked by HELP MEEEEE on December 4, 2014
  37. english

    1. It's sometimes difficult to balance family, friends, and to do school work, as well. family, and friends, and school work, as well.

    asked by Qua on October 16, 2015
  38. Physics

    A team is chosen to design an orbiting space station that is shaped like a wheel 5o meters in diameter with is mass of 4*10^5 kg contained in the rim portion of the wheel. The space station will rotate at a rate such that a person working in the wheel will

    asked by Malcom on April 23, 2009
  39. AP CHEM FULL ?

    This is part of a marathon problem, we have to identify the five compunds of H, N, and O described below. For each compound, I have to write a Lewis structure that is consistent with the information given. a.) All the compunds are electrolytes, although

    asked by Sam on December 3, 2006
  40. Biology

    The metabolic pathways of organism living today evolved over a long period of time- undoubtedly in a step wise fashion because of their complexity. Considering everything you have learned to date about the evolution of life on Earth, put the following in

    asked by Trinh on March 24, 2015
  41. history

    hi can someone please help me with these 5 questions. 1. One manifestation of the rising democratic tide in the 1830s was a. a general raising of the political tone b. use of national nominating conventions I think it's a but i don't know why it can't be B

    asked by phil on November 9, 2008
  42. calculus help thanks!

    The gas law for an ideal gas at absolute temperature T (in kelvins), pressure P (in atmospheres), and volume V (in liters) is PV = nRT, where n is the number of moles of the gas and R = 0.0821 is the gas constant. Suppose that, at a certain instant, P =

    asked by Pal on April 2, 2014
  43. chemistry

    use and activity series to Identify two metals that will not generate hydrogen gas when treated with and acid write balanced molecular equations: aluminum metal with dilute nitric acid Write balanced molecular equations:Calcium hydroxide solution with

    asked by Katie on April 14, 2008
  44. chemistry

    use and activity series to Identify two metals that will not generate hydrogen gas when treated with and acid write balanced molecular equations: aluminum metal with dilute nitric acid Write balanced molecular equations:Calcium hydroxide solution with

    asked by Katie on April 14, 2008
  45. Chem repost

    or the compound: carbon in the middle with 3 bonds -double bond to oxygen -bond to Mn(CO)5 -bond to CH3 group is the oxidation state of the metal +1? d count 6? total electron count 20? coordination number 7?

    asked by mary on February 6, 2009
  46. Chemistry

    An unknown compound contains carbon, hydrogen, and oxygen. When burned, a 2.000 gram sample of this compound releases 3.451 g of carbon dioxide and 1.059 grams of water. What is the empirical formula of this compound? Thank you very much.

    asked by Mom on October 18, 2011
  47. Chemistry

    Draw structural formula for each reaction and state the type of reaction that is occuring: a. 4-nonene and fluorine gas b. hexane and oxygen gas c. pentanol and butanoic acid d. propene and hydrogen gas

    asked by Faro on April 8, 2011
  48. chemistry help

    or the compound: carbon in the middle with 3 bonds -double bond to oxygen -bond to Mn(CO)5 -bond to CH3 group is the oxidation state of the metal +1? d count 6? total electron count 20? coordination number 7?

    asked by brian on February 5, 2009
  49. physics

    A cylinder contains 3.5 L of oxygen at 350 K and 2.5 atm . The gas is heated, causing a piston in the cylinder to move outward. The heating causes the temperature to rise to 640 K and the volume of the cylinder to increase to 9.5 L. What is the gas

    asked by Isabel-A on November 23, 2010
  50. CHEMISTRY

    A compound which contains hydrogen, oxygen, carbon only has molar mass of about 85 g/mol. When 0.43 g of the compound is burned in excess of oxyfen, 1.10 g of CO2 and 0.45 g of H2O are formed. Find the molecular formula and the empirical formula of the

    asked by Clive Lodnyx on July 18, 2016
  51. chemistry help

    for the compound: carbon in the middle with 3 bonds -double bond to oxygen -bond to Mn(CO)5 -bond to CH3 group is the oxidation state of the metal +1? d count 6? total electron count 20? coordination number 7?

    asked by brian on February 5, 2009
  52. Chemistry

    Draw structural formula for each reaction and state the type of reaction that is occuring: a. 4-nonene and fluorine gas b. hexane and oxygen gas c. pentanol and butanoic acid d. propene and hydrogen gas

    asked by Faro on April 8, 2011
  53. chem post

    or the compound: carbon in the middle with 3 bonds -double bond to oxygen -bond to Mn(CO)5 -bond to CH3 group is the oxidation state of the metal +1? d count 6? total electron count 20? coordination number 7?

    asked by mary on February 6, 2009
  54. Chemistry

    Implants carbon dioxide combined with water and energy to form glucose and oxygen gas. Right off the balance equation for this reaction. Glucose =C6H12O6. Given 78g of water. How many grams of glucose can be formed?

    asked by Deedra on March 14, 2018
  55. chemistry please

    or the compound: carbon in the middle with 3 bonds -double bond to oxygen -bond to Mn(CO)5 -bond to CH3 group is the oxidation state of the metal +1? d count 6? total electron count 20? coordination number 7?

    asked by mary on February 6, 2009
  56. chem

    or the compound: carbon in the middle with 3 bonds -double bond to oxygen -bond to Mn(CO)5 -bond to CH3 group is the oxidation state of the metal +1? d count 6? total electron count 20? coordination number 7?

    asked by mary on February 6, 2009
  57. Chemistry

    A sample of .234g of carbon is placed in a closed stainless steel bomb with .502g of of oxygen gas. The mixture is ignited giving of carbon dioxide. How many grams of carbon dioxide should be obtained upon combustion?

    asked by Ben on February 21, 2010
  58. Physics

    In the rough approximation that the density of the Earth is uniform throughout its interior, the gravitational field strength (force per unit mass) inside the Earth at a distance r from the center is gr/R, where R is the radius of the Earth. (In actual

    asked by Mehreen on April 5, 2011
  59. Chemistry

    You dissolve 5 g of calcium hydroxide in 2 liters of water. What is the molarity of the hydroxide ions in this solution? What is the molarity of the calcium ions in this solution?

    asked by Amanda on February 12, 2012
  60. Physics

    Find the center of mass of the carbon monoxide molecule , given that carbon has a mass of 12 u, oxygen has a mass of 16 u , and the two atoms are 0.111 nm apart.

    asked by Mattie on November 30, 2010
  61. biology

    What are the step by step in finding the answer for this? 4C6H1206 carbon atoms: Hydrogen atoms: Oxygen atoms: Molecules:

    asked by Sally on September 19, 2012
  62. physics

    Find the center of mass of the carbon monoxide molecule , given that carbon has a mass of 12 u, oxygen has a mass of 16 u , and the two atoms are 0.111 nm apart.

    asked by Mattie on December 1, 2010
  63. chemistry

    2Hg+O2=2HgO if 50.0 grams of mercury reacts with 50.0 grams of oxygen gas, how many grams of mercury(ii)oxide are produced?

    asked by mom on February 14, 2014
  64. chemistry

    A sample of sulfer, mass 2.56 g is burned in excess oxygen inside a calorimeter of heat capacity 923JK and insulated by 815g of water. If the sole product of combustion is SO2, what is the expected increase in temperature? I don't need the answer, just the

    asked by joanna on November 30, 2010
  65. science

    can u pl answer the following 1. _______ used in air craft to measure altitudes . 2.The metal that burns in oxygen with a dazzling light is _________ . 3. the gas liberated on heating copper corbonate is _________ . 4 .what is king of chemicals ? 5. what

    asked by R S Telagathoty on January 6, 2012
  66. Chemistry

    1) What volume of oxygen gas at 28 Celsius and 102 kPa is needed to react completely with 150 g of iron according to the following reaction. Fe(s) + O2 (g) FeO(s) 2) A bunsen burner is lit in a lab that at 24.7 Celcius and 1.07 atm. What mass of water is

    asked by Peter on January 22, 2017
  67. Marine Science

    How much of the oxygen we breathe is produced by pytoplankton? 20%, 35%, 50%, 7% I think the answer is 50%. Am I correct. All of the following are adaptations some phytoplankton have for floating except? 1) Cells have large cavity in the center 2) spines

    asked by Hannah on November 11, 2009
  68. Chemistry

    When 1.63 g sample of an unknown hydrocarbon is completely burned in oxygen, 4.97 g of CO2 are produced. What is the percentage by mass of hydrogen in this hydrocarbon? THANK YOUU Found out the formula: 4CH+5O2--> 4CO2+2H2O then found out the moles of CH=

    asked by Alex on September 15, 2015
  69. Chem

    What is the change in entropy when 6.03 mL of liquid benzene (C6H6, d = 0.879 g/mL) is combusted in the presence of 26.8 L of oxygen gas, measured at 298 K and 1 atm pressure? (R = 0.0821 L · atm/(K · mol)) 2C6H6(l) + 15O2(g) → 12CO2(g) + 6H2O(l);

    asked by Anonymous on April 10, 2015
  70. Biology - Heart Rate/Blood Pressure

    Hi, can someone help me with these questions? Why is it that athletes have to exercise harder/longer to get max heart rate than people that aren't physically fit? Why does smoking cause rise in blood pressure? (Does it have to do with less oxygen getting

    asked by Glen on May 5, 2008
  71. physics student

    A tank holds 2.85 L of oxygen at 22.1 Celsius and 235 atm. (A) how many moles of gas does the tank contain? (B) what is the average kinetic energy per molecule ? the answer in the text book is (a) 27.7 moles (b) 2.381x10^7pa i just want the formula so i

    asked by physics student need help on January 2, 2013
  72. chemistry

    the percentages of carbon,hydrogen and oxygen in vitamin c were determined by burning a sample weighing 2.00mg,the masses of carbondioxide and water formed are 3.00mg and 0.81mg respectively.from these information,find the percentage of each element and

    asked by yankoua on October 28, 2009
  73. Chemistry

    A 10.0 gram sample of a mixture of CH4 and C2H4 reacts with oxygen at 25°C and 1 atm to product carbon dioxide gas and liquid water. If the reaction produces 520 kJ of heat, what is the mass percentage of CH4 in the mixture? PLEASE HELP! I do not know

    asked by Michelle on October 26, 2014
  74. language arts

    which of the following statements most accurately describes Mr. Lapham and his daughter-in-law Mrs. Lapham? A. Mr. Lapham is kindly and pious; Mrs. Lapham is pragmatic and determined B. Mr. Lapham is concerned about money; Mrs. Lapham is concerned about

    asked by Anonymous on December 9, 2014
  75. CHEMISTRY 3

    Consider the following balanced equation: 2N2H4(g)+N2O4(g)→3N2(g)+4H2O(g) Complete the following table showing the appropriate number of moles of reactants and products. If the number of moles of a reactant is provided, fill in the required amount of the

    asked by Run on October 6, 2014
  76. Chemistry

    The reaction for the metabolism of sucrose, C12H22O11, is the same as for its combustion in oxygen to yield CO2(g) and H2O(l). The standard heat of formation of sucrose is -2230 kJ mol-1. Based upon data in Table 6.2 and problem 6.75 the amount of energy

    asked by Jessica on June 29, 2011
  77. AP Chemistry

    When a sample of methyl salicylate weighing 5.287 grams is burned in excess oxygen, 12.24 grams of CO2 and 2.522 grams of H2O are formed. What is the empirical formula for oil of wintergreen? I know the answer is C8H8O3, I just need help finding out how to

    asked by R on September 16, 2008
  78. Chemistry

    Draw the Lewis structures for BrO3- and ClO4- and indicate their correct number of additional resonance structures. I'm a little confused about this. For example, I've got the correct original form of BrO3- down. Where all 3 O atoms are single bonded to

    asked by Raj on September 28, 2008
  79. chemistry

    If 8.72 grams of oxalic acid, H2C2O4, a diprotic acid, is neutralized when 23.4 mL of a solution of KOH is added, what is the molarity of KOH? the topic is acid-base triation, and i have already converted the mass to moles,but I am having trouble finding

    asked by K on April 10, 2013
  80. Chemistry

    Hi! I have another question. So 1 kcal of heat is added to 1.5 L of oxygen in a container at constant pressure. (1atm). Then volume increases to 3.1L. they want to know total energy change. Now i think the formula is DH=DU + PDV so what i did was DH = 1

    asked by Dave on June 10, 2009
  81. Chemistry

    Hi! I have another question. So 1 kcal of heat is added to 1.5 L of oxygen in a container at constant pressure. (1atm). Then volume increases to 3.1L. they want to know total energy change. Now i think the formula is DH=DU + PDV so what i did was DH = 1

    asked by Dave on June 10, 2009
  82. AP Chemistry

    Given: 2N2(g) +O(2) --> 2N2O(g) Kc =1.2x10^(-35) N2O4(g) --> 2NO2(g) Kc = 4.6x10^(-3) 1/2N2(g) + O2(g) --> NO2(g) Kc= 4.1x10^(-9) Calculate Kc for the reaction between one mole of dinitrogen oxide gas and oxygen gas to give nitrogen tetroxide gas.

    asked by Matt on August 18, 2011
  83. Chemistry

    Hi! I have another question. So 1 kcal of heat is added to 1.5 L of oxygen in a container at constant pressure. (1atm). Then volume increases to 3.1L. they want to know total energy change. Now i think the formula is DH=DU + PDV so what i did was DH = 1

    asked by Dave on June 11, 2009
  84. chemistry

    The density of acetone vapor in equilibrium with liquid acetone, (CH3)2CO, at 33.1°C is 0.832 g L?1. What is the vapor pressure of acetone at 33.1°C, expressed in kilopascals? agian i am confused with formulae, hoe you can helpm thanks! change 0.832 g to

    asked by tyler on November 30, 2006
  85. English

    Can someone please proofread my essay and help me fix and grammar errors I might have. Peyton Farqhar sacrificed his life he had courage, and a purpose. He had plans he was trying to achieve. Taking that into consideration then yes, he might be considered

    asked by Keisha on November 5, 2010
  86. Algebra

    A chemist has one solution that is 80% acid and a second solution that is 30% acid. How many liters of each solution will the chemist need in order to make 50L of a solution that is 62% acid?

    asked by Anonymous on May 10, 2014
  87. math

    joe drank 4 liters of water on monday and 4 deciliters of water on tuesday.how much more water did he drank on monday than on tuesday

    asked by allison on September 6, 2012
  88. IPC

    in a thermonuclear device, the pressure of 0.050 liters of gas within the bomb casing reaches 4000000 atm. when the bomb casing is destroyed by the explosion, the gas is released into the atmosphere where it reaches a pressure of 1.00 atm. what is the

    asked by Elizabeth on December 4, 2013
  89. Chemistry

    When 50 mL of 1.0 M AgNO3 is added to 50 mL of 0.50 M HCl, a precipitate of AgCl forms. After the reaction is complete, what is the concentration of silver ions in the resulting solution? (a) 0.50 M (b) 1.0 M (c) zero (d) 0.25 M (e) 0.75 M How do I go

    asked by Anonymous on February 2, 2010
  90. math

    a rectangular courtyard is 57m 50cm long and 22 m board . determine the least possible number of square stones of the same size required to pave it ?

    asked by faiq on July 25, 2017
  91. Physics

    What is the angular momentum of a 2.4 kg uniform cylindrical grinding wheel of radius 12 cm when rotating at 1800 rpm? How much torque is required to stop it in 4.0 s?

    asked by DL on December 11, 2009
  92. Phamacy math

    One teaspoonful diluted to a quart results in a 1/5000 solution. What is the amount of potassium permanganate in grams required to fill this prescription?

    asked by Nick on September 22, 2012
  93. Chemistry

    How many grams of zinc metal are required to produce 2.00 L of hydrogen gas at STP according to the chemical equation shown below? Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

    asked by Ryan on June 4, 2015
  94. Inorganic chem

    What mass of baking soda (NaHCO3) would be required to neutralize 10.00mL of 12.1M muriatic acid remaining in a empty water bottle?

    asked by Becca on April 16, 2015
  95. Physics

    A 600kg car is moving on a level road at 30m/s.how large is a retarding force is required to stop it in a distance of 70m

    asked by value on July 8, 2016
  96. Biochemistry

    What volumes of 25 mM CH3COOH and 25 mM NaCH3COO are required to prepare 300 mL of a 0.25 M buffer of pH = 5.0? (pKa = 4.76) I keep getting something along the lines of 19ml for the conj. base..I know that's way wrong. help please!

    asked by DanV on September 11, 2011
  97. Physics

    A corvette can go from 0~60 mph in 4.3 seconds. If the mass of the car is 1443 kg how much work is required to complete this task (assuming it is on a horizontal road)?

    asked by galina on July 11, 2018
  98. Chemistry

    3NO2 + H2O = 2HNO3 + NO How many grams of nitrogen dioxide are required to produce 5.89 x 10 to the 3rd power kg HNO3 in excess water?

    asked by Katelyn on December 1, 2011
  99. Chemistry

    What is the molar mass of 0.500 g of unknown monoprotic acid used in titration, if 22.5 mL of 0.15 M NaOH solution was required to neutralize it? I do not need the answer, but instead an example of how to do a question just like it.

    asked by Cheyenne on November 12, 2014
  100. Economics

    How will a new law mandating an increase in required levels of automobile insurance affect the equilibrium price and quantity in the market for new automobiles?

    asked by Nickey on October 18, 2007