1. Chemistry

    4Al + 3O2 = 2Al2O3. If 41.5 g aluminum and 69.0 g oxygen undergo a reaction that has a 67.0% yield, What mass of aluminum oxide forms. Please help by showing steps to find answers. Thanks
  2. Chem.

    2SO2(g) + O2(g) ---> 2SO3 It says that 12.0 L of sodium trioxide are produced at 100 degrees celcius. What volume of oxygen is produced? How would I go about doing this. I was going to use PV=nRT but I dunno the pressure so I can't find the moles. What
  3. Chemistry

    What mass, in grams, of oxygen gas (O2) is contained in a 10.5 liter tank at 27.3 degrees Celsius and 1.83 atmospheres Trouble figuring out what formula to use to get the answer...want to understand how to get the right answer
  4. pharmacy calculations

    Coumadin Take 5mg on even days, take 2.5 mg on odd days Disp: 30 days supply If the stock supply is only 5mg tablets, how many tablets will be required to fill the prescription? If the stock supply is only 2.5mg tablets, how many tablets will be required
  5. Chemistry 171 Lab

    Suppose we collect hydrogen gas, H2(g), over water at 21◦C in a vessel with total pressure of 743 Torr. If the hydrogen gas is produced by the reaction of aluminum with hydrochloric acid: 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g) what volume of
  6. chemistry

    what frequency of radiation in Hz is required to ionise helium?
  7. N/A

    The most basic software required for an online course where writing is involved is:
  8. Science

    During Active and Passive transport is ATP required?
  9. physical science

    how much power is required to lift the crate
  10. physics

    Two instances during which the heating effect of current is not required
  11. Chemistry

    How much heat is required to warm 1.50 kg of sand from 20.0 C to 100.0 C?
  12. chemistry

    calculate the L of 5.00 M HCI required to neutralize 500.0 mL of 1.00 M Ca (OH)2
  13. Math

    How much foil is required to cover a rectangular box that is 4 in by 8 in by 5 in?
  14. Chemistry

    How much 1.0 M NaOH would be required to completely neutralize 40.0 mL of 0.60 M HCl?
  15. chem

    how many ml of 0.15 m naoh solution are required to neutralize 35.00 ml of 0.22 m hcl
  16. fish

    what is required for goldfish to retain bright colors?
  17. Chemistry

    How many mL of 3.0 M HCL are required to neutralize 250 mL of 2.0 M MgCL2 ?
  18. chemistry

    how much heat is required to vaporise 2 litres of ethanol
  19. government

    Why are people required to join a political party??
  20. Physics

    How much heat is required to raise the temperature of 70 g of water from 20 C to 80 C?
  21. science

    What force is required to accelerate a 1,000 kg car 5 m/s2?
  22. chemistry

    how many moles of H2SO4 are required to react with 2.63 mol of AL
  23. science

    How much energy is required to lift a 40.00 kg bag of sand 1.02 m
  24. physics

    How many joules of heat are required to melt 20.0 kg of ice at 0°C?
  25. chemistry

    how many mL of 0.15 M NaOH solution are required to neutralize 35.00 mL of 0.22 M HCl
  26. math

    (2.85*10^4)(3.67*10^6)= ? in scientific notation 3-4 digit answer required
  27. Chemistry

    What mass of Ca(OH) 2 is required to make 1.5 l of a 4.0% (w/v) solution of Ca(OH)2 in water?
  28. Chemistry

    How much heat is required to melt 110g of ice at-45°C?
  29. chemistry

    How many Milliliters of 3.50 M HCl (aq)are required to react 5.75g of Zn(s)?
  30. biology

    Name any 3 mineral elements that are required for the formation of membrenes.
  31. chemistry

    What volume of 0.1 M NaOH is required to neutralize 30 mL of 0.1 M HCl?
  32. science

    how much of naoh is required to neutralize 1500 ml of 0.1 N hcl
  33. chemistry

    If you have 64.3 g NH3, how many grams of F2 are required for complete reaction?
  34. physics

    what potential difference is required to pass 3.0 A through 28 ohm's
  35. chemistry

    How many grams of na cl are required to make 500ml of a 0.65 percent w/v
  36. chemistry

    How many photons will be required to raise the temperature of 2.0 g of water by 2.5 K?
  37. Essay writing-Business

    What is the front required for papers?
  38. Math

    A and B are two events. P(A/B)=5/11 P(A~B)=9/10 (~ indicates either A or B) P(B)=x How do we find P(A^B')? (^ indicates both A and B) I got, P(A^B)=5x/11 P(A)=(9/10)-(6x/11) Is there any way we can get a relationship between P(A^B) and the required
  39. English

    What type of FONT is required for academic papers please? Thank you
  40. chemistry

    Explain what is required to create a buffer that needs to protect the pH between 8.1 and 8.5
  41. Physics

    What force is required to accelerate an object having a mass of 3 kg at 5 m/s2?
  42. Chemistry

    How many milliliters of 8.40×10^2M Ba(OH)2(aq) are required to titrate 48.65mL of 5.26×10^2M HNO3?
  43. Chemistry

    How much heat is required for 32.5g of Na2co3 to completely decompose?
  44. social studies

    An example of interstate cooperation required by the consitution would be
  45. chem121

    how many moles AL(OH)3 are required to completelyreactwith 2.75 molesof H2SO4?
  46. geometry

    how much foil is required to cover a rectangular box that is 4 in. by 8 in. by 5 in.?
  47. chemistry

    how many mL of a .25 M HCL would be required to neutralize completely 30mL of a .2 M Ca(OH)2
  48. chemistry

    what mass NaOH is required to react exactly with 25.0 ml of 3.0 M H2S04
  49. mathsliteracy,lifescience and geography

    Are they required for fire fighter??
  50. chemistry

    How many kilocalories are required to produce 1.83mol of aluminum?
  51. Chemistry

    What is the required volume of an acid to prepare 2 L of solution a 10% (v/v).
  52. chemistry

    How many milliliters of 3.60 {\rm M} {\rm HCl} are required to react with 140 {\rm mL} of 1.60 {\rm M}{\rm Al}({\rm OH})_{3}?
  53. chemistry

    How much 6M HNO3 will be required to decrease the pH of 5000L solution of pH=9.6 to pH=3?
  54. effective essay

    Across font required fro apers?
  55. DrBob222

    The unique rate for the combustion of ethane is 0.44 M/s (a) what is the rate that oxygen reacts? (b) what is the rate of formation of water molecules?
  56. Chemistry

    which atom has the least attraction for the electrons in a bond between that atom and an atom of hydrogen? (1) carbon (2)nitrogen (3)oxygen (4) fluorine
  57. chemistry

    I need help setting up this problem: A 5.0 sample of O2 is in a container at STP. What volume is the container and how many molecules of O2 in the container and how many atoms of oxygen?
  58. Chemistry

    If 80.0 grams of methane were reacted with 368 grams of oxygen, how many grams of water would be formed (find limiter first).
  59. chemistry

    when writing chemical equations, for example, next to oxygen I have to write (g) for gas and next to other different chemicals I have to write (aq) for aqueous. What do I write next to H2O?
  60. English

    IS THIS PARAGRAPH ACCEPTABLE FOR THE INFORMATION REQUIRED? Your goal is to persuade your cousin to apply for the job. You e-mail her a paragraph explaining the specifics of the job and the reasons she should apply. You want to convince her that she has the
  61. Economic

    1.The most important tool the Fed has to control the money supply is a. changing the federal funds rate. b. changing the required reserve ration. c. open market operations. d. changing the discount rate 2. Banks use their excess reserves to a. make new
  62. Chemistry

    Suppose it is a hot summer day (40.0 degrees C = 104.0 degrees F), and you have left a can of hairspray outside so the gas within it is now at the same temperature of its surroundings. As part of your chemistry lab class, you have to build a safe and
  63. Chemistry

    Suppose it is a hot summer day (40.0 degrees C = 104.0 degrees F), and you have left a can of hairspray outside so the gas within it is now at the same temperature of its surroundings. As part of your chemistry lab class, you have to build a safe and
  64. Chemistry

    The reaction between hydrogen and oxygen to produce water gives off heat. What is the source of this heat? how could this heat be measure?
  65. Chem

    Use the reaction that occurs when magnesium burns in oxygen to show how a reaction might be included in more than one category of reaction.
  66. Chemistry

    What volume of NaOH is required to neutralize 50mL of 0.5M phenol? So this is just a small calculation in a complex problem, and I would just like someone to check my work so I don't mess up the entire problem based on this calculation. So mol phenol=
  67. physics/biology

    Determine the number of uncompensated ions (both total number and as a percentage of the bulk ions) required to establish a charge of 100mV across a membrane of a spherical cell that is 25 ƒÊm in diameter. Assume that the total number of ions inside and
  68. Language Arts

    Read the following excerpt from "Saving Water." “Abandon the bathtub, and hit the showers. Sometimes it just feels great to soak in the tub, but the tub holds between nine and 33 gallons (40 to 50 liters) of water, depending on how full we fill it.”
  69. Chemistry

    A mixture contains 0.218 mol of Mn2O3 and 17.8 g of MnO2. 1.How many atoms of oxygen are present in the mixture? 2.How many grams of manganese are in the mixture?
  70. Chem

    Find the empirical formula of a compound found to contain 63.15 percent carbon 5.30 percent hydrogen and 31.55 percent oxygen I got C27H27O
  71. Chemistry

    To balance the oxygen and hydrogen for a redox reaction that takes place in acidic solution, it is necessary to use which of the following?A. H2O and H+ B. H2O only C. H2O and OH- D. OH- only
  72. Chemistry

    Recognize each of the following reactions as synthesis, decomposition, single replacement, double replacement, neutralization, or combustion. A)H3PO4 + 3NaOH -> Na3PO4 + 3H20 This reaction is known as Neutralization. B)P4 + 5O2 -> P4O10 This reaction
  73. Composite Materials

    Can someone please help with this problem? A burnout test was performed to determine the volume fractions of constituents in a glass/epoxy composite. The following observations were made: Weight of empty crucible = 47.6504 g Weight of the crucible and
  74. Math

    The cooling system of a car has a capacity of 20 liters. If the system is currently filled with a mixture that is 60​% ​antifreeze, how much of this mixture should be drained and replaced with pure antifreeze so that the system is filled with a
  75. Algebra

    Boyle's Law says that the volume of a gas varies inversely with the pressure. When the volume of a certain gas is 5 liters, the pressure is 158 kPa (kilopascals). What is the volume when the pressure is 395 kPa?
  76. Chemistry

    Consider a sample of helium and a sample of neon, both at 30ºC and 1.5atm. Both samples have a volume of 5.0 liters. Which statement concerning these samples is not true? a- each weighs the same amount b- each has the same # of atoms of gas c- the density
  77. Maths

    1.Humans breathe about 15 breathe in a minute.The average breath at rest contains 0.76 liter of air.About how many liters of air will you breathe while at rest for 25 minutes? 2.Greta ran the 400-m dash in 49.07 s.If Greta ran at a constant rate,how many
  78. Finance

    1. What is an entrepreneur? (1 point) a sole proprietorship a corporation one who opens a new business a bank that loans money 2. Which of the following is the best definition of probable operating costs? (1 point) Amount of money required to start a
  79. physics

    Your physics teacher drives an ideal frictionless car of mass 1000 kg which coasts along the level road to his home at a constant speed of 48 km/h with the engine turned off. It then coasts 40 m up his sloping driveway and comes to rest at the top without
  80. Chem

    Compound B is burned in a bomb calorimeter that contains 1.50 liters of water. When I burned 50.0 grams of compound B in the calorimeter, the temperature rise of the water in the calorimeter was 35.0 degrees C. If the heat of combustion of compound B is
  81. Chemistry

    I don't get how to fill in the blanks Show the products for cellular respiration by completing the following chemical reaction equation. Give the correct formula for oxygen as well Glucose+_________ ---> ________+______+___________
  82. chemistry

    Draw one of the Lewis structure of the N2O5. In each case one oxygen bridges the nitrogens (N-O-N single bond) and 2 other oxygens are bonded to each N. How many equivalent resonance structures are there that satisfy the octet rule and where O makes at
  83. chem

    2) How many moles of nitrogen monoxide will be produced when 80.0 grams of oxygen are used? What volume of ammonia is needed? this iz the equation 4NH3 + 5O2 -> 6H2O + 4NO the 1st part i got 4 mol NO and i don't no how to do the 2nd prt
  84. Bio

    without oxygen cellular respiration grinds to a standstill although glycolysis can continue to make some atp anaerobically for a short time explain why the oxidative phosphorylation stops why does the citric acid cycle stop
  85. Chemistry

    Can you help me calculate the maximum weight-percent of H present in liquid iron containing 0.16 wt% Oxygen and equilibrated with H2O(g) at a pressure of 0.164 atm at 1600°C. Given ÄG° = -207653 + 0.292T J and assume that O and H both obey Henry’s
  86. Chemistry

    Hi , I have this question and I do not know what steps to follow. Please help guide me. It will be really appreciated. Calculate the extent of oxidation in a stream where water it's in equilibrium with atmospheric oxygen and had a pH pic 6.5 (a(H3O+)
  87. Chem

    A synthesis reaction occurs between 15.0g of gallium and 15.0g oxygen. 1- Write a balanced equation. Ga + 02 --> Gao2 (I got this part) 2- Setup two factor labels to determine the mass of product possible considering each reactant. Please help #2. I
  88. chemistry

    Draw one of the Lewis structure of the N2O5. In each case one oxygen bridges the nitrogens (N-O-N single bond) and 2 other oxygens are bonded to each N. How many equivalent resonance structures are there that satisfy the octet rule and where O makes at
  89. science

    Ions are electrically charged particles that are formed when certain compounds are dissolved in water. These solutions will conduct electricity. The Swedish scientist Svante Arrhenius coined the term ion (which means wanderer) to explain why solutions of
  90. Chemistry

    How many oxygen atoms are in a) 3.21 x 10^22 molecules CH3OH b) .250 mol C6H12O6 Is it a) 3.21 x 10^22 atoms b) 9.03 x 10^23 atoms
  91. chemistry

    Find the number of K atoms, C atoms, and O atoms in 95.5g of K2Cr2O7. (Potassium 2, Chromium 2, Oxygen 7).
  92. Chemistry

    At a deep-sea station that iss 200. m below the surface of the Pacific Ocean, workeres live in a highly pressurized enviornmetn. how many liters of gas at STP must be compressed on the surface to fill the underwater enviorment wiht 2.00*10^7 L of gast a
  93. biology

    Choose the total number of each item requested below. 4C6H12O6 Carbon atoms Hydrogen atoms Oxygen atoms Molecules
  94. Chemistry

    0.356 grams of an unknown metal reacts with oxygen to form 452 milligrams of the metal oxide. Identify the metal
  95. chemistry

    What is the balanced equations for: .Calcium and ethanol .Potassium dichromate, Dilute Sulphuric Acid and Ethanol .Ethanol abd oxygen
  96. Chemistry

    #5 Limiting Reactants How many grams of water will be produced in the complete combustion of 20.0 grams of Octane, C8H18(g) and 50.0 grams Oxygen gas?
  97. chemistry

    What is the empirical formula of a compound that contains two moles of calcium, two moles of sulfur and eight moles of oxygen? A. CaS0 B. CaS02 C. CaSO4 D. Ca2S0 i think D
  98. Math

    One canned juice drink contains 30% orange juice; another is 10% orange juice. How many liters of each should be mixed together in order to get 20L that is 28% orange juice? I want step by step help.
  99. Math

    In a certain coastal basin, the sea water contains 3.5 grams of salt per 1000 milliliters of water. How many grams of salt would be in 2 liters of the sea water.
  100. managment science

    Supposed you have been hired as a Marketing Manager in a Multinational Company which is dealing in high tech products. Company wants to launch a cell phone in the market which can measure the Sugar level and Heart beat of the users. Since, it is a