1. chemistry

    some oxygen occupies 500.0 ml when its temperature is 40.0 C . if you wished to decrease the volume by 100.0 ml, to what temperture celsius would you need to lower the gas? not sure how to set this up right..keep thinking i need to subtract 100.0 from

    asked by Harley on February 2, 2011
  2. science

    I am currently learning about respiratory system in anatomy and this question is not very clear to me: moves from blood to alveoli: _______ moves from alveoli to blood: ________ I am thinking it may be carbon dioxide and oxygen respectively, but I am not

    asked by Anonymous on November 26, 2007
  3. chemistry

    2 C3H6(g) + 2 NH3(g) + 3 O2(g) → 2 C3H3N(g) + 6 H2O(g) a. What mass of acrylonitrile can be produced from a mixture of 1.24 kg of propylene (C3H6), 1.61 kg of ammonia, and 1.90 kg of oxygen, assuming 100% yield? b. What mass of water is produced?

    asked by Anonymous on October 19, 2013
  4. Chemistry

    Use oxidation numbers to identify if this reaction is REDOX reactions. SO2(g) + H2O(l) -> H2SO3(aq) for oxidation #s I got: SO2 = -2 for the S = -2 for the o2 H20 = +1 for H2 = -2 for O --> H2SO = +1 for H2 = -2 for S = -2 for O3 There for one oxygen was

    asked by Amy on June 19, 2011
  5. Chemistry (Check)

    Nitrogen combines with oxygen to form a variety of compounds. One of these compounds is called nitrous oxide or "laughing gas." What is the formula of nitrous oxide if this compound is 63.65% N and 36.35%O by weight? I got N2O

    asked by Anonymous on October 13, 2015
  6. ap chemistry

    Carbon monoxide reacts with oxygen to form carbon dioxide by the following reaction: 2CO(g) + O2(g) ! 2CO2(g) H for this reaction is −135.28 kcal. If 811.7 kcal is released, how many moles of CO must have reacted?

    asked by cheri on October 31, 2012
  7. Chemistry

    14 grams of coal undergoes complete combustion in 58 grams of oxygen gas. What volume of gas (measured at 25 degrees celsius and 100 kPa) is present when the reaction is complete?

    asked by James on July 12, 2016
  8. chem

    hemoglobin, the oxygen-carrying protein in red blood cells, has four iron atoms per molecule and contains .340 percent iron by mass. calculate the molar mass of hemoglobin! thanks! :)

    asked by skye on August 16, 2012
  9. science

    The chemical formula for glucose is C6H12O6. Six molecules of carbon dioxide (CO2) react with six molecules of water (H2O) to form six molecules of oxygen (O2). How many molecules of glucose will be produced? A 1 B 6 C 12 D 36 can anyone help me figure

    asked by Sabrina on March 26, 2010
  10. biology

    I have a question about reduced and oxidized chemicals and potenital enery. Reduced have weaker PE because they hold on to their electrons and oxidized have strong PE because they can let go electrons right? If I am right then why is that CO2 has a low PE

    asked by Anonymous on October 20, 2009
  11. Chemistry

    In the explosion of a hydrogen-filled balloon, 0.75 g of hydrogen reacted with 6.9 g of oxygen to form how many grams of water vapor? (Water vapor is the only product.) I am really confused on how to do this.

    asked by Rebekah on September 11, 2010
  12. Chemistry

    The gas sulfur dioxide, SO2, oxidizes to form another gas, sulfur trioxide, SO3. How many oxygen atoms are present in 3.20 g of sulfir trioxide?

    asked by b. on November 6, 2012
  13. Chemistry

    In a certain reaction 0.20g of hydrogen gas combines with 3.20g of oxygen gas.if the relative molecular mass of the compound is 34.0 find its molecular formula (H=1,O=16).

    asked by feyonce on January 15, 2017
  14. Physics

    An astronaut of mass 70 kg carries an empty oxygen tank of mass 14 kg. He throws the tank away from himself with a speed of 3 m/s. With what velocity does the astronaut start to move through space?

    asked by Dylan on January 16, 2012
  15. Science 7R - HW Qs. Check (PLZ read!)

    What is the difference between aerobic and anaerobic organisms? My Answer: Aerobic requires oxygen, anaerobic doesn't. Is my answer to this question is correct. Please reply this post! Thank You!

    asked by Laruen on February 3, 2012
  16. chemistry

    a 5 g mixture of natural gas containing ch4 and c2h4 was burnt in excess of oxygen yielding 14.5 g of co2 and h2o.What is the weight of ch4 and co2 in the mixture

    asked by sim on July 25, 2013
  17. CHEMISTRY

    Which of the following gases will occupy the smallest volume at 300 K and 760 torr and why? 80 g diatomic oxygen 80 g methane 80 g hydrogen fluoride All gases will occupy the same volume

    asked by susan on October 17, 2010
  18. chemistry

    A 4.78-g sample of aluminum completely reacts with oxygen to form 6.67 g of aluminum oxide Use this data to calculate the mass percent composition of aluminum in aluminum oxide. (Sorry need help with this!)

    asked by Luis on September 27, 2014
  19. chemistry

    In the explosion of a hydrogen-filled balloon, 0.30g of hydrogen reacted with 2.4g of oxygen to form how many grams of water vapor? (Water vapor is the only product.)

    asked by johnny on September 6, 2011
  20. chemistry

    a compound with the molecular weight of 276 grams was determined to be 39.10% carbon, 8.77% hydrogen, and 52.13% oxygen. what is the empiricial formula and the molecular formula for the compound? i do not know where to start!

    asked by shelly on November 28, 2009
  21. Chemistry

    Heat is given off when hydrogen burns in air according to the equation: 2H2 + O2 ---> 2H2) What is responsible for the heat? I know the answer is froming hydrogen-oxygen bonds gives off energy, but why?

    asked by Jessica on January 17, 2014
  22. chemistry

    A sample of ammonium phosphate(NH4)3PO4 contains 3.18 moles of hydrogen atoms. The number of moles of oxygen atoms in the sample is (1)0.265 (2)0.795 (3)1.06 (4)4.00

    asked by Anonymous on July 1, 2015
  23. Biology

    Why does the blood go from the lungs to pick up oxygen and then return back to the heart to be pumped around the body ? Why can't it just get out of the lungs from the first pump and then pick up an artery and go around of the body instead of returning ?

    asked by ASA on March 17, 2008
  24. Chemistry

    In the experiment 0.500 g of copper reacted with oxygen to give 0.563 g of copper oxide. What is the empirical formula of the oxide expressed as a chemical formula?

    asked by Brenda on October 24, 2012
  25. College Chemistry 3

    Find the empirical Formula of a compound that is 30.4% nitrogen by mass, and consists of only nitrogen and oxygen. What is its molecular formula if its molar mass is 92g/mol?

    asked by Ernesto on August 15, 2012
  26. chemistry

    9 grams of carbon and 1.5 grams of hydrogen combined with oxygen to make a compond whose mass is 22.5 and whose relative molecular mass is 60.determine the molecular formula

    asked by super_vani on July 29, 2009
  27. Science

    Which of the following sets of words can be used to describe the outputs of photosynthesis? water, glucose, light energy carbon dioxide, glucose, chemical energy oxygen, glucose, chemical energy glucose, oxygen, light energy Which of the following is true

    asked by Anonymous on February 7, 2014
  28. U.S. Government

    I have this question on a homework assignment and I need help. Under Chief Justice Marshall's definition of "interstate commerce" as quoted from the Gibbons v.Ogden case, which one of the following activities would most likely be subject to regulation by

    asked by Anonymous--Need Help!! on January 19, 2007
  29. Chemistry

    How many moles of water can be made from 4 moles of oxygen gas and 16 moles of hydrogen gas? What is the Limiting Reagent?

    asked by Fred on March 11, 2010
  30. Chemistry

    3O2 -> 2O3 When 4.26 x 10^16 mol of oxygen (O) are converted into ozone, how many mol of the pollutant (O3) are formed? A. 2.84 x 10^16 mol O2 B. 6.39 x 10^6 mol O2 C. 2.84 x 10^1 mol O2 D. 2.84 x 10^16 mol O2 D?

    asked by Michael on January 26, 2018
  31. Chemistry

    How many moles of water can be made from 4 moles of oxygen gas and 16 moles of hydrogen gas? What is the Limiting Reagent?

    asked by Fred on March 11, 2010
  32. chem

    How many moles of water can be made from 4 moles of oxygen gas and 16 moles of hydrogen gas? What is the limiting reagent?

    asked by Anonymous on June 2, 2008
  33. Physics

    Find the jet fuel mileage (mpg) of a Boeing 787 Dreamliner if: C=0.024, v=900 km/h, 1 gallon=3.8 liters, 1 mile= 1.6 km, energy conversion efficiency=30%, A=2060 ft^2, 1 ft^2=0.093 m^2, drag force = 1/2(CApv^2), p=0.41 kg/m^3 at 10,000 m, jet fuel energy

    asked by Rosanne on October 28, 2014
  34. Chemistry

    Assume that some of the magnesium nitride is not completely converted to magnesium hydroxide and subsequently to magnesium oxide. Will your empirical formula be too high in magnesium or too high in oxygen? Please show any calculations you used to determine

    asked by Liliah on February 15, 2014
  35. chemistry calculations

    when 2.750 g of the oxide of lead is heated to a high temperature,it decomposes to produce 0.0640 g of oxygen gas and 2.686 g of some new lead oxide compound.How can you use this data to determine the formula of the new compound?

    asked by joan on December 4, 2013
  36. Chemistry

    In the explosion of a hydrogen-filled balloon, 0.80g of hydrogen reacted with 6.4g of oxygen. How many grams of water vapor are formed? (Water vapor is the only product.) Express your answer using two significant figures.

    asked by Anonymous on September 7, 2013
  37. Chemistry

    Determine the partial pressure of oxygen collected by water displacement if the water temperature is 20.0 ◦ C and the total pressure of the gases in the collection bottle is 760 torr. PH2O at 20.0 ◦ C is equal to 17.5 torr.

    asked by Kaitlin on January 28, 2013
  38. Chemistry

    In a body of fresh water, a dissolved oxygen concentration of 0.262 or higher is usually needed to maintain a healthy aquatic ecosystem. For a lake to maintain this concentration, what is the maximum water temperature?

    asked by Amy on February 24, 2011
  39. Chem Help

    In body of fresh water, a dissolved oxygen concentration of 0.225 mM or higher is usually needed to maintain a healthy aquatic ecosystem. For a lake to maintain this concentration, what is the maximum water temperature?

    asked by Sene on January 31, 2009
  40. Chemistry

    In a body of fresh water, a dissolved oxygen concentration of 0.262 or higher is usually needed to maintain a healthy aquatic ecosystem. For a lake to maintain this concentration, what is the maximum water temperature?

    asked by Amy on February 24, 2011
  41. CHEM

    Calculate the density of oxygen, , under each of the following conditions: STP 1.00atm and 25.0 degrees celsius Express your answers numerically in grams per liter. Enter the density at STP first and separate your answers by a comma.

    asked by Kara on October 24, 2008
  42. Chemistry

    In a body of fresh water, a dissolved oxygen concentration of 0.262 or higher is usually needed to maintain a healthy aquatic ecosystem. For a lake to maintain this concentration, what is the maximum water temperature?

    asked by Amy on February 24, 2011
  43. Chemistry

    a sample of a compound with a mass of 0.4168g is extracted from a plant. Decompostion of this sample produces 0.1667g of carbon, 0.2223g oxygen, and the remainder is hydrogen. What is the percentage compostion (by mass) of the compound?

    asked by Cali on December 3, 2015
  44. biology

    Bromothymol blue (BTB) is a chemical that turns yellow in the presence of carbon dioxide. In the presence of oxygen, BTB stays blue. In his science class, Sanjay used BTB to test for the presence of those two gases in three situations. *Sanjay's Procedure*

    asked by Cody on December 17, 2008
  45. CHEMISTRY

    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 Kajana Stomack on October 26, 2015
  46. CHEMISTRY

    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 5, 2014
  47. adult education

    California Clinics, an investor-owned chain of ambulatory care clinics, just paid a dividend of $2 per share. The firm’s dividend is expected to grow at a constant rate of 5% per year, and investors require a 15 % rate of return on the stock. 1. What is

    asked by 1time on November 20, 2010
  48. physics

    A rigid tank contains 38:0 kg of O2 gas at a pressure of 9:70 atm. If the oxygen is replaced by helium, how many kilogram of helium will be needed to produce a pressure of 8:00 atm?

    asked by miya on May 20, 2013
  49. CHEM HELP PLZZZZZZZZZZZZZZZZZ

    use the experimental molar mass to determine the molecular formula for ocompounds having the following analysis.b) 54.53% carbon 9.15% hydrogen, and 36.32% oxygen; experimental molar mass 88

    asked by john on March 20, 2008
  50. Chemistry

    A mixture of gases at 760.0 torr contains 35.0% nitrogen, 22.0% oxygen , and 43.0% carbon dioxide by volume. What is the pressure of the carbon dioxide gas in torr?

    asked by Erica on August 19, 2011
  51. Chemistry

    In the explosion of a hydrogen filled balloon, 0.50 g of hydrogen reacted with 4.0 g of oxygen to form how many grams of water vapor? (water vapor is the only product)

    asked by Jennifer on September 4, 2011
  52. Chemistry

    Which will produce a decrease in entropy? dissolving sodium chloride in water dissolving oxygen in water sublimation of naphthalene is it the third option, sublimation?

    asked by Anonymous on April 11, 2010
  53. college

    One mole of oxygen gas is at a pressure of 5.10 atm and a temperature of 32.0°C. (a) If the gas is heated at constant volume until the pressure triples, what is the final temperature?

    asked by Anonymous on February 24, 2010
  54. chemistry.

    Methane, CH4 burns in oxygen gas to form carbon dioxide and water. How many moles of carbon dioxide will be formed from 8.0g of methane?

    asked by Denmark on September 28, 2009
  55. CHEMISTRY

    which one of the following reactions represents the balanced chemical equation for the formation of water from hydrogen gas and oxygen gas? a. 2H(g) + O(g) a H2O(I) b. H2(g) +o(g) a H2O(I) c. 2 H2(g) + O2(g) a 2 H2O(I) d. 2 H(g) + 1/2 O2(g) a H2O(I)

    asked by GRACE on May 9, 2010
  56. maths

    A factory was required to produce a crtain number of television in four days. On the first day, it produced 1/6 of the required number of television sets. On the second day, it produced another 18 sets. On the third day it produced twice as many television

    asked by ssss on April 14, 2012
  57. Chemistry

    What is the de Broglie wavelength of an oxygen molecule, O2 traveling at 521 m/s? Is the wavelength much smaller or much larger than the diameter of an atom. (on the order of 100 pm) De Broglie wavelength = h/mv h = Planck's constant in J*s. m is mass in

    asked by Lauren on November 3, 2007
  58. Physics

    If two protons and two neutrons are removed from the nucleus of an oxygen-16 atom, a nucleus of which element remains? Carbon 12 will be the answer, but i need to understand the answer. I requested help from a friend but was given the answer and not

    asked by Sean on August 28, 2013
  59. Chemistry

    A sample of benzene, C6H6, weighing 3.51 g was burned in an excess of oxygen in a bomb calorimeter. The temperature of the calorimeter rose from 25.00 C to 37.18 C. If the heat capacity of the calorimeter is 12.05 kJ/K, what is the molar energy of

    asked by Marie on March 18, 2010
  60. 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
  61. Calculus

    Following 2 questions are from a book at a point where L’Hopital’s Rule, Squeeze Theorem etc. have not been discussed and limits (A) and (B) as given below are to be evaluated by simple methods like algebraic simplification etc. 1. Int. of (xlogx)dx

    asked by MS on March 12, 2014
  62. Calculus

    Following 2 questions are from a book at a point where L’Hopital’s Rule, Squeeze Theorem etc. have not been discussed and limits (A) and (B) as given below are to be evaluated by simple methods like algebraic simplification etc. 1. Int. of (xlogx)dx

    asked by MS on March 13, 2014
  63. Biology

    What does your body need oxygen for A. It is necessary to aerate the brain C. Cells need it to produce the energy they need to function D. Air flow aids in blood flow within the blood vessels E. It produces hemoglobin, needed to carry carbon dioxide My

    asked by Keon on December 2, 2015
  64. chemistry

    Dr bob, Thanks, i understand that, at last! But wot if im asked to calculate when it is given as words? would it still be the same? Ie. instead of Al2O3, im giving it in words ie aliminium oxide. Basically im asked to calculate the mass of oxygen and the

    asked by bertie on February 5, 2007
  65. chemistry

    The activation energy for the reaction in which CO2 decomposes to CO and a free radical oxygen atom, O, has activation energy of 460 kJ mol^-2. The frequency factor is 2 x 1011 s^-1. What is the rate constant for this reaction at 298 K?

    asked by Massiel on March 20, 2011
  66. Chemistry

    2 B5H9(l)+12 O2(g)---->5 B2O3(s)+9 H2O(l) Calculate the kilojoules of heat released per gram (kJ/g) of the compound reacted with oxygen. The standard enthalpy of formations of B5H9(l), B2O3(s), and H2O(l) are 42.84, -1271.94, and -285.83 kJ/mol,

    asked by W on November 2, 2010
  67. chemistry

    ogen and oxygen react to form nitrous oxide as: 2 N2 (g) + O2 (g) ⇌ 2 N2O (g) Of a mixture of 0.482 mol N2 and 0.933 mol O2 is placed in a reaction vessel of 10.0 L and allowed to from N2O at a temperature for which Kc = 2.0 X 10-37, what will be the

    asked by Marwan on December 7, 2016
  68. smk lutong

    A compound consists only of carbon, hydrogen, nitrogen, and oxygen.  Combustion of 10.68 g of the compound  produced 16.01 g carbon dioxide and 4.37 g of water.  the molsr mass of the compound is 176.1 g/mol. what are the

    asked by nadeen on September 16, 2013
  69. chemistry

    When NH3 is treated with oxygen gas, the products obtained are N2(g) and H2O(l). If standard enthalpies of formation at 298 K for NH3(g) and H2O(l) are –46.00 kJ/mol and –286.0 kJ/mol respectively, calculate the enthalpy change of the reaction.

    asked by Shana on January 27, 2015
  70. Chemistry

    A compound containg 3 atoms of carbon and 8 atoms of hydrogen is combined in a reaction with oxygen molecules. The two end products of this equation are carbon dioxide (CO2) and water. What element should you look at first in balancing this equation?

    asked by MV on July 4, 2008
  71. Chemistry

    Liquid methanol (CH3OH) is combusted in oxygen gas to yield carbon dioxide gas and liquid water Okay I keep getting this: CH3OH(l) + 1.5 O2(g) > CO2(g) + 2 H2O(l) the website tells me I'm wrong, but I don't know how to go about with out using fractions.

    asked by Jason on July 2, 2009
  72. chem

    When NH3 is treated with oxygen gas, the products obtained are N2(g) and H2O(l). If standard enthalpies of formation at 298 K for NH3(g) and H2O(l) are –46.00 kJ/mol and –286.0 kJ/mol respectively, calculate the enthalpy change of the reaction.

    asked by shana on January 27, 2015
  73. General Chem

    Nitrogen oxide reacts with oxygen gas to form nitrogen dioxide (NO2). In one experiment 0.866 mole of NO is mixed with 0.503 mole of O2. Calculate the number of moles of NO2 produced

    asked by Alexis on October 12, 2012
  74. Science, Astrenomey

    This is my theory, read well if you wish to know the truth: according to the big bang, there is a equal amount of anti-matter to the matter, BUT nearly all that matter is missing! In this theory there was NO anti-matter when the earth was made. anti-matter

    asked by The Curse Word Destroyer, age 11 on August 23, 2012
  75. chem

    Liquid carbon disulfide reacts with 415 mL of oxygen to produce the gases carbon dioxide and sulfur dioxide. What volume of carbon dioxide is produced? Answer in units of L

    asked by reis on May 31, 2014
  76. chemistry

    Potassium nitrate is made by adding potassium chloride to hydrogen nitrate in the presence of oxygen gas. Along with the potassium nitrate, chlorine and water are produced. How would write the equation?

    asked by mark on February 26, 2012
  77. Legal aspect of business

    ABC is a multinational enterprise (MNE) incorporated in State X. ABC entered into a joint venture agreement with XYZ, an MNE incorporated in State Y, to jointly produce a new line of hydraulic equipment in ABC's new factory in State Z, a developing nation.

    asked by Louise on May 23, 2013
  78. algebra

    How much of a solution that is 45% sulfuric acid needs to be mixed with a solution that is 90% sulfuric acid to produce 120 liters of a solution that is 60% sulfuric acid?

    asked by jo on March 16, 2017
  79. algebra

    How much of a solution that is 45% sulfuric acid needs to be mixed with a solution that is 90% sulfuric acid to produce 120 liters of a solution that is 60% sulfuric acid?

    asked by Jo on March 17, 2017
  80. Programming

    How would the flow charts and pseudocode look for this? The Metric Conversion application is a menu-driven program. First, the program displays a Main Menu that states the purpose of the program and allows the user to select one of five metric system

    asked by Nyeel on November 26, 2012
  81. Physics

    What is the potential difference required to accelerate a deuteron of mass 3.3x10^27kg and charges 1.6x10^-19C from rest to a speed of 5.0x10^6m/s?

    asked by Lucy on April 21, 2009
  82. Physics

    A ball has a diameter of 3.70 cm and average density of 0.0841 g/cm3. What force is required to hold it completely submerged under water? I need to find the magnitude in N Thank you!

    asked by Allie on October 28, 2011
  83. Science

    one year ago How many Global Positioning System (GPS) satellites are required to pinpoint your location on Earth’s surface? (1 point) 24 12 3 5 i think it's 4, but 4 is not an option

    asked by Elliot on May 10, 2015
  84. BUSINESS MATH

    : The Crescent Corporation just paid a dividend of $2 per share and is expected to continue paying the same amount each year for the next 4 years. If you have a required rate of return of 13%,

    asked by T on December 17, 2014
  85. Math

    A rectangular courtyard is 57m and50cm long and 22m broad determine the least possible number of square stones of the same size required to pave it

    asked by Hussain on August 10, 2016
  86. physics

    A 95 N block rests on a table. The sus- pended mass has a weight of 22 N. What frictional force is required to keep the blocks from moving? Answer in units of N.

    asked by help ! on January 10, 2011
  87. chemistry

    Determine the minimum volume of 6.40M HNO3 required to dissolve a 2.40g sample of Cu. 2NO3-(aq)+8H+(aq)+3Cu(s)-->2NO(g)+4H2)(l)+3Cu2+(aq)

    asked by Catalina on April 28, 2010
  88. Chemistry

    What volume of 0.300 M Na3PO4 is required to precipitate all the lead(II) ions from 140.0 mL of 0.400 M Pb(NO3)2? I desperately need help with this, I cannot figure it out, my mind is bleeding.

    asked by Casey on June 17, 2010
  89. Chemistry

    For the reaction 4FeCl2(aq) + 3O2(g) → 2Fe2O3(s) + 4Cl2(g), what volume of a 0.650 M solution of FeCl2 is required to react completely with 8.58 × 1021 molecules of O2?

    asked by Olivia on February 24, 2015
  90. Science

    Plants continue to grow throughout their lives by producing new plant material. Photosynthesis is required for this process to occur. True or false? And explain why.

    asked by Please check on September 23, 2015
  91. Calculus (Definite Integrals)

    How many definite integrals would be required to represent the area of the region enclosed by the curves y=(cos^2(x))(sin(x)) and y=0.03x^2, assuming you could not use the absolute value function? a.) 1 b.) 2 c.) 3 d.) 4 e.) 5

    asked by Mishaka on March 1, 2012
  92. chemistry

    calculate the heat required to raise the temperature of 100g HCl gas from 300k to 800k at constant pressure Cp = 30j/k mol

    asked by amira on January 4, 2011
  93. chemistry

    calculate the heat required to raise the temperature of 100g HCl gas (m.wt = 36.5) from 300k to 800k at constant pressure (Cp=30k/j.mol

    asked by amira on January 4, 2011
  94. chemistry

    What volume in ml of 0.0985 m NaOH solution is required to reach the end point in the complete titration of a 15.0 ml sample of 0.124 M phosphoric acid?

    asked by AmyN on July 22, 2013
  95. physics

    how much force is required to stop a 100 mi/hr fastball? assume the catcher's mitt stops the ball in 1 millisecond and the mass of a baseball is 145 g

    asked by dick on May 29, 2014
  96. physics

    how much force is required to stop a 100 mi/hr fastball? Assume the catcher's mitt stops the ball in 1 millisecond and the mass of a baseball is 145 g.

    asked by george on March 8, 2015
  97. Chemistry

    What molar ratio of acetic acid to sodium acetate is required to create a buffer solution having a pH of 4.83 at 25 Celsius? Ka for HC2H3O2 is 1.8 x10^-5 a)0.82 b)0.55 c)3.5 d)1.2 e)2.0 The answer I got was 8.2 ..(help!)

    asked by Viv on March 23, 2013
  98. Chemistry

    What volume of 0.300 M Na3PO4 is required to precipitate all the lead(II) ions from 130.0 mL of 0.400 M Pb(NO3)2? Can you please show the steps I have no idea how to solve

    asked by Ashley on June 21, 2013
  99. math for busness and finance

    what sinking fund payment would be required at the end of each six-month period, at 12% interest compounded semiannually, in order to amount to $40,000 within four years?

    asked by Chudy on January 13, 2014
  100. IT

    What steps would you take in diagnosing an application that has been changed from its original state? How does this affect the level of support required to facilitate Microsoft® Access® users?

    asked by Sandra on October 25, 2011