1. Thermodynamics

    Suppose you start with a liquid mixture of 60% nitrogen and 40% oxygen. Describe what happens as the temperature of this mixture increases. Be sure to give the temperatures and compositions at which boiling begins and ends.

    asked by Tina on April 11, 2013
  2. Chemistry

    4NH3 + 7O2 --> 4NO2 + 6H20 1) How many grams of oxygen are necessary to produce 4.50 moles of NO2? 2) How many molecules of water are produced when 2.25 moles of ammonia are completely reacted?

    asked by anonymous on November 24, 2007
  3. Chemistry

    Suppose the atmospheric pressure during the experiment was 751 mmHg. The temperature of the water was found to be 23.0 degrees celsius. What is the pressure of the oxygen gas, Po2 that is produced?

    asked by Casey on September 27, 2012
  4. Chemistry

    How many moles of aluminum oxide can be produced from 12.8 moles of oxygen gas (O2) reacting with excess aluminun (Al)? useing this equation: ---- I don't get how to do these? 4Al(s) + 3O2--> 2Al2O3(s)

    asked by Jane on April 14, 2011
  5. Thermodynamics

    Suppose you start with a liquid mixture of 60% nitrogen and 40% oxygen. Describe what happens as the temperature of this mixture increases. Be sure to give the temperatures and compositions at which boiling begins and ends.

    asked by Tina on April 10, 2013
  6. chem

    2H2(g)+ O2(g) --> 2H2O(L) I know the oxidizing agent is oxygen and the reducing agent is hydrogen. what are the number of electrons transferred in the balanced chemical equation? (I put 2 and tried -2 but it didn't seem right)

    asked by tami on October 5, 2011
  7. chem

    How much heat (in {kJ}) evolves when 7.0L of C2H2(d = 1.0967kg/m^3) is mixed with a stoichiometric amount of oxygen gas? The combustion reaction is C2H2+ 5/2 O2-> 2 CO2+ H2O, Delta H=-1299.5 kJ

    asked by Chironjit on November 19, 2012
  8. 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 do

    asked by Lena on December 11, 2008
  9. Thermodynamics

    Suppose you start with a liquid mixture of 60% nitrogen and 40% oxygen. Describe what happens as the temperature of this mixture increases. Be sure to give the temperatures and compositions at which boiling begins and ends.

    asked by Tina on April 10, 2013
  10. Biology

    Please help: In glycolysis followed by either lactic acid or alcoholic fermentation produce _____ ATP molecules, while cellular respiration using oxygen produces ____ ATP. 1) 2,8 2) 4,2 3) 2,4 4) 2,38 Thanks a million!

    asked by Amy on November 16, 2011
  11. Chemistry

    50cm'3 of sulphur (iv) oxide were produced at s.t.p when some quantity of powdered sulphur were burnt in excess oxygen.state the equation for the reaction Ans S+O2g-2SO2

    asked by Anonymous on June 1, 2015
  12. 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

    asked by Anonymous on July 23, 2011
  13. chemistry

    This has to do with law of conservation of mass I believe but it stumps me. 50g or iron reacts with 21g of oxygen to form how many gram of iron oxide? Is the answer 71g or 29g

    asked by ben on September 3, 2011
  14. Chemistry

    A 0.5438 g sample of a compound contains only C H and O was burned completely in oxygen.the products were 1.0390 g CO2 and 0.6369g H2O. Determine the empirical formula of thr compound

    asked by Aontor on May 17, 2016
  15. chemistry

    If 987g of oxygen gas reacts completely with hydrogen gas, what volume of water vapor will be produced (in L) at 0.954 atm and 465 degree=es celcius?

    asked by Kierstin on May 12, 2016
  16. 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

    asked by Pamela on July 17, 2011
  17. chemistry

    Fumaric acid, which occurs in many plants, contains, by mass, 41.4% carbon, 3.47% hydrogen, and 55.1% oxygen. A 0.050-mol sample of this compound weighs 5.80 g. The molecular formula of this compound is

    asked by Tierney on October 6, 2009
  18. chemistry

    Consider the following reaction 4Al + 3O2 = 2Al2O3 It takes 2.00 L pure oxygen gas at STP (0C ,1atm ) to react completely with a certain aluminum. What is the mass of aluminum reacted?

    asked by NONO on November 18, 2011
  19. Science

    Balanced chemical equation for the carbon monoxide gas for motor car engines combines with the oxygen gas in the air to produce carbo dioxide

    asked by Sibusiso on September 27, 2010
  20. chemistry help

    Determine the empirical formula for each substance. 1. A dead alkaline battery is found to contain a compund of Mn and O. Its analysis gives 69.6% Mn and 30.4% O. 2. A compound is 38.77% Cl and 61.23 %O. 3. Magnetic iron oxide is 72.4 % iron and 27.6%

    asked by peter on March 23, 2009
  21. chemistry

    I have the same question as Chopsticks determine the emperical formula of the compound 25.3%copper, 12.9%sulphur, 25.7% oxygen, 36.1% water Can the answer be CuSO4(H2O)5? or does it have to be CuSO4 x 5H2O thanks in advance.

    asked by sh on January 16, 2009
  22. physics/chem

    Calculate the number of coulombs of positive charge in 261 cm3 of (neutral) water. (Hint: A hydrogen atom contains one proton; an oxygen atom contains eight protons.)

    asked by dave on March 31, 2008
  23. CHEMISTRY URGENT!

    a sample of oxygen that occupies 1.00 x 10^6mL at 575mmHg is subjected to a pressure of 1025atm. what will the final volume of the sample be if the temperature is held constant? how do uu set up the equation

    asked by kacie on February 3, 2013
  24. chemistry

    I was trying to do a balanced reaction equation to show cyanide being oxidized by hypochlorite ion to cynate. I wasn't sure if there needed to be oxygen in the equation too. CN + NaOCl = OCN + NaCl

    asked by Mel on April 6, 2010
  25. Science

    Check this Compare renewable and nonrenewable energy sources, and discuss the effects of each on biodiversity. My answer Renewable resources are things like the wind and sun. You will never run out of these things. Nonrenewable resources are things like

    asked by Ange on April 29, 2016
  26. physical chemistry

    2 liters of N2 at 0 degree Celsius and 5 atm pressure are expanded isothermally against a constant pressure of 1 atm until the pressure of the gas is also 1 atm. Assuming the gas to be ideal, what are the values of work,delta E, delta H, and q for the

    asked by lyn on September 29, 2012
  27. chemistry

    The level of water in an Olympic size swimming pool (50.0 meters long, 25.0 meters wide, and about 2 meters deep) needs to be lowered 3.2 cm. If the water is pumped out at a rate of 5.0 liters per second, how long will it take to lower the water level 3.2

    asked by Grayson on January 16, 2015
  28. chemistry

    The level of water in an Olympic size swimming pool (50.0 meters long, 25.0 meters wide, and about 2 meters deep) needs to be lowered 5.0 cm. If the water is pumped out at a rate of 4.7 liters per second, how long will it take to lower the water level 5.0

    asked by jode on May 15, 2014
  29. 7th grade science

    what 6 things do living things need. Such as water and oxygen and...

    asked by Drummond on September 18, 2008
  30. astrophysics

    If the wavelength of Hydrogen is 21.10611405413 cm, what is the wavelength of oxygen in cm?

    asked by james on March 5, 2011
  31. Chemistry

    How many moles of oxygen are produced when 20 moles decomposed?

    asked by Majiri on September 16, 2017
  32. chemistry

    how many grams of nitrogen will react with 23 grams of oxygen

    asked by missy on February 21, 2013
  33. Science

    how many gram of oxygen in persent in 36 gram of water?

    asked by Deepak on July 20, 2011
  34. science chemistry

    How many moles of oxygen atoms are there in 2 moles of CuSO4?

    asked by John on February 8, 2009
  35. chemistry

    why is there no pop of pure oxygen and pure hydrogen?

    asked by alex on January 24, 2016
  36. Chemistry

    How many moles of bromine are obtained from 6.75 moles of oxygen?

    asked by Melanie on March 15, 2010
  37. science

    How many moles of water are produced when 5.00 moles of oxygen are used?

    asked by holli on May 8, 2008
  38. chemistry

    How many grams of water can be formed from 10 grams of oxygen?

    asked by ashley on December 12, 2012
  39. accounting

    On December 31, 2008, University Theatres issued $500,000 face value of bonds. The stated rate is 6 percent, and interest is paid semiannually on June 30 and December 31. The bonds mature in 10 years. Required: If required, round your answers to the

    asked by me on July 20, 2011
  40. Chemistry

    I havent been at school for 8 days due to somthing wrong with my heart, but the teachers gave me work. I have no clue how to do them. I really need help please, There all due tomarrow. Ammonia is formed by reacting nitrogen and hydrogen gases. How many

    asked by Help please on April 5, 2010
  41. Edit plz!!!

    can u edit this plz!!!:D --> In order to gain knowledge and prove your statement/point, you will have to do research. Research can be described in many ways such as through friends/family, and through experience and observation. To research , you must

    asked by Thara* on January 30, 2010
  42. English*

    can u edit this plz!!!:D --> In order to gain knowledge and prove your statement/point, you will have to do research. Research can be described in many ways such as through friends/family, and through experience and observation. To research , you must

    asked by Thara* on January 30, 2010
  43. 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

    asked by Edwin on November 25, 2016
  44. 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

    asked by gabriella on January 25, 2009
  45. 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 don't

    asked by yengiang on February 3, 2013
  46. 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

    asked by K on November 6, 2014
  47. 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

    asked by Brian James on April 9, 2015
  48. 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

    asked by john on November 4, 2014
  49. 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+)

    asked by Sarah on December 10, 2016
  50. 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+_________ ---> ________+______+___________

    asked by Steve on May 16, 2007
  51. 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

    asked by Jim on February 26, 2009
  52. Chemisrty

    Determine which law is appropriate for solving the following problem. What volume will 1.56 liters of a gas at 27°C and 745 mmHg of pressure occupy at 100°C and 700 mmHg of pressure? Law used: Boyle's Law Charles' Law Combined Gas Law

    asked by Angel on October 19, 2011
  53. chemistry

    Ammonia is often produced by reacting nitrogen gas with hydrogen gas. How many liters of ammonia gas can be formed from 12.9 L of hydrogen gas at 93.0°C and a pressure of 43.5 kPa? (Assume an excess amount of nitrogen gas.) I have absolutely no idea how

    asked by kendall on March 17, 2015
  54. Algebra

    3. In his propane oven, he bakes two baking sheets with 24 Peanut Butter cookies on each sheet, two baking sheets with 18 Chocolate Chip cookies on each sheet, and one baking sheet with 10 Peanut Butter cookies and 12 Chocolate Chip cookies Write an

    asked by Anonymous on August 19, 2011
  55. 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

    asked by Miley on March 4, 2008
  56. 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

    asked by Evelyn on January 18, 2013
  57. Chemistry

    The freezing point of a solution is A. lower than the freezing point of the solvent alone because higher temperature is required to accelerate solvent molecular motion enough to overcome obstructon by solute particles.. B. lower than the freezing point of

    asked by Blair on August 4, 2008
  58. chemistry

    The freezing point of a solution is A. lower than the freezing point of the solvent alone because higher temperature is required to accelerate solvent molecular motion enough to overcome obstructon by solute particles.. B. lower than the freezing point of

    asked by ryan on October 4, 2010
  59. English

    Can you help me check this paragraph? Thank you for your last corrections! 1) It was midnight. We were walking through the street. There wasn’t anybody, everything was quiet, when a fast car jumped out of the darkness. 2)The car crashed against a wall

    asked by Franco on January 23, 2010
  60. Spanish

    Spanish help please.....!!!! _________________ The directions I was given was this: Choose the word that correctly completes the sentence (a; para; que); or select "No word is required". _________________ I'm stuck on all of the ones I was given. Pls help

    asked by guitarpick03 on March 27, 2018
  61. chem

    (b) (4 pts.) 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

    asked by Anonymous on March 23, 2013
  62. 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

    asked by Bree on June 18, 2010
  63. math

    How many liters of a 2.5% bleach solution must be mixed with a 10% bleach solution to produce 600 ml of a 5% bleach solution?

    asked by Ali on September 8, 2014
  64. math

    A pharmacist has an 18% alcohol solution and a 40% alcohol solution. How much of each should he mix together to make 10 liters of a 20% alcohol solution?

    asked by Russian buddy on March 5, 2017
  65. 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

    asked by courtney on April 8, 2010
  66. math

    When one rents an apartment, one is often required to give the landlord a security deposit that is returned if the apartment is undamaged when you leave. In some localities, the landlord is required to pay the tenant interest once a year compounded yearly.

    asked by Melissa on January 29, 2019
  67. Physics

    Two 0.53-g basketballs, each with a radius of 17 cm, are just touching. How much energy is required to change the separation between the centers of the basketballs to 1.1 m? (Ignore any other gravitational interactions.) How much energy is required to

    asked by Cooper on November 9, 2011
  68. 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

    asked by mehboob on January 11, 2011
  69. Chemistry

    A 25.00 ml sample of a standard solution containing 1 g of CaCO3/L required 25.20 ml of EDTA to fully complex the Ca present. Calculate the volume of EDTA stoichiometrically equivalent to 1.0 mg of CaCO3. From the volume of EDTA required in titrating the

    asked by Anonymous on March 14, 2010
  70. physics

    A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. At one time it is rotating at 7.8 rad/s; 60 radians later, its angular speed is 19 rad/s. Calculate (a) the angular acceleration (rad/s2), (b) the

    asked by kristy on November 13, 2013
  71. college chemistry

    Comparing the boiling points of: A) C3H8 B) C5H12 C) C2H5OH and identify the folowing statements as either True or False: Dispersion forces only for (A) Boiling point (C) > Boiling point (A) (B) exhibits hydrogen bonding Boiling point (C) < Boiling point

    asked by Stefanie on November 11, 2010
  72. science

    the process in which an animal's cells use oxygen and digested food molecules to release the energy in food is called 1. breathing 2. cellular respiration 3. diffusion*** 4. gas exchange

    asked by Anonymous on February 9, 2015
  73. Chemistry

    2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(g) In the equation, if 14 L of ethane (C2H6) and 14 L of oxygen (O2) combined and burned to completion, which gas will be leftover after the reaction, and what is the volume of that gas remaining?

    asked by Giselle Meza on October 6, 2015
  74. Chemistry

    The alcohol in gasohol burns according to the reaction C2H5OH(l) + 3O2(g) --> 2CO2(g) + 3H2O how many grams of water are produced when 3.0 moles of C2H5OH are burned in an excess of oxygen gas?

    asked by Lana on October 15, 2012
  75. Chemistry

    How many grams of oxygen can be produced by heating 10.0g of mercury (II) oxide? Sulfuric acid is added to 8.10g of magnesium, how many grams of hydrogen are set free? Answered abovd.

    asked by Beautiful on March 5, 2007
  76. EXAM TMRW

    Calculate the energy in kJ/mol of light with a wavelength of 360 nm. 9.17 * 10^-43 J/mol Oxygen gas at 34.5 °C expands from 34.5 L to 45.7 L against a constant pressure of 750 mmHg. What is the work done in joules by the system? 1.13*10^3 J

    asked by plz chk my answers for Chemistry on December 1, 2008
  77. Chemistry!!

    How do I go about doing this question? How much heat energy is involved when 5.58g of Fe metal reacts with excess oxygen to produce Fe2O3? Do you need the equation, and if so, what would tha be? Fe + O2 > Fe2O3? I don't think that is right though. And

    asked by Lulu on November 22, 2008
  78. Chemistry

    a mixture of .0285g of H and .0141 mol of oxygen in a closed container is sparked to initiate a reaction. How many grams of H2O can form?Which reactant is in excess and how many grams remain?

    asked by Tyler on September 28, 2011
  79. de Broglie Wavelength

    The presence of oxygen atoms on the surface results in auger electrons with a kinetic energy of approximately 505 eV. What is the de Broglie wavelength of this electron? [KE= (1/2)mv^2; 1 electron volt (eV) = 1.602*10^-19 J]

    asked by Kyle on November 13, 2009
  80. science

    The process in which an animal’s cells use oxygen and digested food molecules to release the energy in food is called a. Breathing b. cellular respiration c. diffusion d. gas exchange

    asked by Anonymous on October 7, 2015
  81. chemistry

    The combustion reaction of acetylene gas is represented by this equation: 2C2H2(g) + 5 O2(g) ==> 4CO2(g) + 2H2O(g) How many grams of CO2 and grams of H2O are produced when 52.0g C2H2 burns in oxygen?

    asked by Danny on March 22, 2010
  82. Science

    1. Which of the following is not a function of the circulatory system? Breaks down large molecules delivers oxygen to blood cells takes carbon dioxide away from body cells **Fights infection**

    asked by 444 on January 29, 2019
  83. General Chemistry : for Nursing

    Im Having a really Hard time with this problem :( ---> A sample containing 5.60g O2 gas has a volume of 31.0L . Pressure and temperature remain constant. 1 .) Oxygen is released until the volume is 8.00L . How many moles of O2 are removed?

    asked by Shayla on November 11, 2013
  84. Chemistry 3A

    C2H2(g)+ 5/2o2(g)-> 2Co2(g)+ H2o(g)+ 1255.8KJ how many grams of C2H2 are reacted when 310 KJ of heat are released? I left the oxygen (O) lowercase in the equation so it does not get mixed up with zero.

    asked by Gurjot on December 10, 2012
  85. Chem

    2H2(g)+O2(g) ---> 2H2O(l) delta H= -572kJ/mole of O2 Calculate the amount of heat evolved when 10g of hydrogen are burned in excess oxygen. Can someone please explain step by step? =D

    asked by Shirley on July 15, 2012
  86. Chemistry

    Please help me write these two balanced equations. Dissolution of rust, Fe2O3, by sulfuric acid. and Ammonium nitrite reacts with oxygen to form ammonium nitrate. Any help would be awesome, thankyou.

    asked by Susan on April 30, 2014
  87. chemistry

    the reaction of aluminum metal (Al) with oxygen (O2) forms Al2O3. What is a balanced equation for this redox reaction. What are two half reactions to show how many electrons are gained or lost by each species?

    asked by cathy on April 11, 2010
  88. 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 μm in diameter. Assume that the total number of ions inside and

    asked by Anna on January 29, 2007
  89. 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

    asked by Ann on January 30, 2007
  90. Physics - Torque

    Consider a rectangular block of mass 30kg, height= 3m, length = 2m. A force F is applied horizontally at the upper edge. The acceleration of gravity is 9.8 m/s^2. 1)What is the minimum force required to start to TIP the block? 2)What is the minimum

    asked by Belle on April 22, 2007
  91. math

    6.6*10^-4 --------- = ? 9.54*10^-7 in scientific notation form 3-4 digit answer is required

    asked by waffles on September 13, 2012
  92. Chemistry

    Calculate the ratio of NaF to HF required to create a buffer with a pH of 4.00.

    asked by Cooper on March 28, 2012
  93. math

    To increase the temperature of 100.0g of H20 from -50.0C to -10.0C how much energy is required?

    asked by Jamal Campbell on February 17, 2016
  94. science

    How much work is required to lift a 3.3-kg concrete block to a height of 1.2 m?

    asked by vanessa on February 4, 2012
  95. science

    how many grams of nacl are required to neutralize 100 ml of 1M h2so4???

    asked by Chemistry on March 15, 2017
  96. Ap Chemistry

    HOw much energy is required to ionize a mole of Hydrogen atoms?

    asked by Ivy on September 8, 2011
  97. math

    (3.845*10^-4)(3.67*10^6) in scientific notation 3-4 digit answer required

    asked by waffles on September 12, 2012
  98. Science

    How many ml of .150 M Na2CrO4 will be required to oxidise 40 ml of .05M Na2S2O3

    asked by Kirti on November 25, 2017
  99. Chemistry

    How many photons with a wavelength of 450 nm is required to have mass of 1.25 micrograms?

    asked by Michelle on October 15, 2012
  100. Chem

    How many grams of O2 are required to burn13.0g of acetylene? The answer I got is 40gO2 is this right.

    asked by Kelsey on April 25, 2011