1. Math

    neha scored 75% in science,95% in maths and 70% in english. If the max. marks in these subjects were 80,100and 70,respectively. find her aggregate percentage.

    asked by Simran kaur on November 18, 2012
  2. math

    The length and breadth of a rectangular paper were measured to be the nearest centimeter and found to be 18 cm and 12 cm respectively. Find the percentage error in its perimeter.

    asked by kudu on February 21, 2015
  3. chemistry

    how does band gap energy work? when dealing with voltages and color change from LEDs[depends on phosphorous percentage]

    asked by sara on April 26, 2008
  4. Statistics

    Given that a sample is approximately bell-shaped with a mean of 60 and a standard deviation of 3, the approximate percentage of data values that is expected to fall between 54 and 66 is

    asked by Dawn on January 22, 2012
  5. MATH

    Money in a bank account that compounds interest by some percentage acts _______.? A.linearly B.exponentially C.negatively D.like a fraction Is it B?

    asked by Meredith Grey on March 9, 2015
  6. math

    a new physician saw 841 clients during the first year of her practice and 1,072 the second. which represents the percentage increase in client volume? a. 22% b. 27% c. 78% d. 127%

    asked by mary on March 12, 2013
  7. science

    a can potatoes has the following data: recall 4-9system carbs=22 fat is 10 grams and protien is 13 find the percentage of each if the calories = 275

    asked by paul on October 4, 2011
  8. Us History

    please help me! what was the percentage of african slaves in the north, south,east, and west in the years of 1820,1835,1845, and 1860??

    asked by Keyshia on January 20, 2010
  9. Math

    The length and breadth of a rectangular paper were measured to be the nearest centimeter and found to be 18 cm and 12 cm respectively. Find the percentage error in its perimeter.

    asked by John on March 7, 2015
  10. microeconomics

    Question 7 of 20 5.0 Points Suppose that the elasticity of demand for a product is 0.5 and quantity demanded increases by 20%. What must the percentage decrease in price have been?

    asked by tg on August 14, 2013
  11. Math Lit

    A second hand car was put up for sale for R65000.After 2 months it had not sold,and the shop marked it down to R58000. What was the percentage decrease?

    asked by Thabo on February 5, 2012
  12. Finance

    I need help computing the Annual percentage yield (APY) for a savings account that earned $56 in interest on $800 over 365 days? HELP PLEASE!

    asked by Haley on May 14, 2011
  13. computer

    Write an algorithm to enter marks of three subject for 100 students and find average and percentage if age is greater than 20 and less than 25

    asked by shahab on November 21, 2016
  14. statistics

    CALCULATE THE PERCENTAGE OF CASES THAT FALL BETWEEN THE SCORES 120 AND 110 ON A NORMALLY DISTRIBUTED iq TEST WITH A MEAN OF 100 AND A STANDARD DEVIATION OF 10

    asked by ROXIE on December 1, 2010
  15. Chemistry

    What is the percentage of gas (C2H2) formed when 2.66g of calcium carbide (CaC2) reacts completely with 50g water?

    asked by Bill on January 26, 2016
  16. Chemistry+Percentage

    Calculate the percentage of water in each of the following hydrates. Aluminum bromide hexahydrate I just need help setting this up. I can work it from there Would it be: AlBr * 6H2O Did I write it right?

    asked by Chopsticks on January 14, 2009
  17. Science physics

    The least count of a screw gauge is 0.001cm the diameter of a wire measured by it is 0.225cm. Find out the percentage error in this measurement

    asked by Kanika on June 18, 2016
  18. statistics

    Given that a sample is approximately bell-shaped with a mean of 60 and a standard deviation of 3, the approximate percentage of data values that is expected to fall between 54 and 66 is

    asked by Anonymous on August 23, 2010
  19. math

    The length and breadth of a rectangular paper were measured to be the nearest centimeter and found to be 18 cm and 12 cm respectively. Find the percentage error in its perimeter

    asked by kud on April 15, 2018
  20. Finance

    I need help computing the Annual percentage yield (APY) for a savings account that earned $56 in interest on $800 over 365 days? HELP PLEASE!

    asked by Haley on May 14, 2011
  21. Stats

    Given that a sample is approximately bell-shaped with a mean of 60 and a standard deviation of 3, the approximate percentage of data values that is expected to fall between 54 and 66 is 75% 95% 68% 99.7%

    asked by Ashley on March 4, 2012
  22. Physics

    If the length of pendulum is 0.8+/-0.01m and time peroid is 2.5+/-0.012 sec. Then percentage error in acceleration due to gravity will be

    asked by Anonymous on March 13, 2016
  23. Physics

    Two pans of a balance are 50cm apart. If the fulcrum is displaced by 1cm what percentage is the true weight marked up? the answer i got was 1.3%, please help if wrong (which it probably is).

    asked by ralph on December 10, 2010
  24. science

    The least count of a screw gauge is 0.001cm.the diameter of wire measured by it is 0.225cm.find out percentage error in the measurement.

    asked by Anonymous on June 30, 2016
  25. Accounting

    What impact does amt have on the decision to whether to use either the percentage of completion method or completed contract for reporting profit on longterm contracts?

    asked by Marie on November 28, 2011
  26. chemistry

    how many grams of solid magnesium nitrate should be added to 5.0 grams of solid sodium nitrate in a 500 mL volumetric flask in order to produce an aqueous 0.25M solution of NO3- ions (once the flask is filled to the 500mL volume line)? No idea where to

    asked by alex on May 25, 2015
  27. statitics

    Assume the body temperatures of healthy adults are normally distributed with a mean of 98.20 °F and a standard deviation of 0.62 °F (based on data from the University of Maryland researchers). a. If you have a body temperature of 99.00 °F, what is your

    asked by ann on August 20, 2011
  28. 12th grade

    2. Assume the body temperatures of healthy adults are normally distributed with a mean of 98.20 °F and a standard deviation of 0.62 °F (based on data from the University of Maryland researchers). a. If you have a body temperature of 99.00 °F, what is

    asked by Anonymous on June 15, 2010
  29. statistics

    Assume the body temperatures of healthy adults are normally distributed with a mean of 98.20 °F and a standard deviation of 0.62 °F (based on data from the University of Maryland researchers). a. If you have a body temperature of 99.00 °F, what is your

    asked by sweet on August 16, 2010
  30. Statistics

    Assume the body temperatures of healthy adults are normally distributed with a mean of 98.20 °F and a standard deviation of 0.62 °F (based on data from the University of Maryland researchers). a. If you have a body temperature of 99.00 °F, what is your

    asked by Sasha on April 19, 2010
  31. Chemistry

    The Solvay process for the manufacture of sodium carbonate begins by passing ammonia and carbon dioxide through a solution of sodium chloride to make sodium bicarbonate and ammonium chloride. The equation for this reaction is H2O + NaCl + NH3 + CO2 →

    asked by David on April 3, 2010
  32. Chemistry--Quick Question

    Which of the following are LAWS according to the Scientific Method? It is possible for more than one answer. a. The volume of a gas is inversely proportional to its pressure. b. A solid has a mass of 100.0 grams and a volume of 11.1 mL. c. When a piece of

    asked by Kathryn on January 18, 2011
  33. chemistry

    Nitric acid, a very important industrial chemical, is made by dissolving the gas nitrogen dioxide (NO2) in water. Calculate the moles of gas produced in 2 L volume container, 736 torr and 50 ºC if the gas behaves as ideal:

    asked by aaloy on April 16, 2008
  34. chemistry

    Nitric acid, a very important industrial chemical, is made by dissolving the gas nitrogen dioxide (NO2) in water. Calculate the moles of gas produced in 2 L volume container, 736 torr and 50 ºC if the gas behaves as ideal

    asked by SAARA on April 18, 2008
  35. chemistry

    A 250 L vessel is evacuated and then connected to a 50.0 L bulb with compressed nitrogen. The pressure in the combined containers is 1672 mm Hg. If the temperature remained at 20 °C throughout the process, what was the initial pressure in the 50.0 L bulb?

    asked by Anonymous on November 6, 2011
  36. chemistry

    You have a metal tank containing 74.0 moles of nitrogen gas at a pressure of 15.0 atm. If the pressure is measured at a temperature of 25.0 °C, then the volume of the tank must be ___ liters. (Round your answer to one decimal place and do not include

    asked by Kala on September 8, 2014
  37. chemistry

    Under SATP, magnesium was reacted with acid and 500 ml of hydrogen gas was collected over water. A) what is the vapor pressure of water? B) What is the pressure of the hydrogen gas? C) What amount of hydrogen was produced? I only know how to do the law of

    asked by kiersten on January 18, 2015
  38. Computer programming

    Submit pseudocode for the following programming exercise: Fat Gram Calculator Design a program that asks for the number of fat grams and calories in a food item. Validate the input as follows: - Make sure the number of fat grams and calories are not less

    asked by Viper on April 5, 2011
  39. CHEMISTRY

    A gaseous mixture was prepared by taking equal mole of CO and N2 .if the total pressure of the mixture was found 1 atmosphere ,the partial pressure of nitrogen (N2) in the mixture is.

    asked by Tanya on March 22, 2015
  40. science chemistry

    N2 (g) + 3H2 (g) -> 2NH3 (g) assume 4 molecules of nitrogen and 9 molecules of hydrogen are present. after complete reaction, how many molecules of ammonia are produced. do i go from N to NH3 or H to NH3?

    asked by cook on October 5, 2011
  41. Chemistry

    Given the chemical reaction: N2+3H2--->2NH3 If 20 molecules of nitrogen react with 30 molecules of hydrogen to from ammonia, what is the total number of molecules present after the reaction goes to completion?

    asked by Songyi on October 31, 2008
  42. Chemistry

    5.88 moles of nitrogen and 16.2 moles of oxygen are mixed and heated at 2000C° until equilibrium is established ,11,28 moles of nitric oxide are formed . Calculate the value of equilibrium constant?

    asked by Anonymous on October 28, 2018
  43. Chemistry

    When sulfuric acid is added to magnesium nitrate, is the resulting product soluble or insoluble in water? Does a precipitate form? I think that the product is insoluble, and no precipitate forms. Is this right? The part I'm most unsure about is whether or

    asked by Anonymous on December 3, 2008
  44. Chemistry

    What do I do when writing the net ionic equation for Magnesium nitrate reacted with sodium chloride? I've wrote out the molecular equation and the total ionic equation. Everything cancels out....under my total ionic equation do i just write no reaction?

    asked by Jack on January 19, 2011
  45. Physics

    The masses of 1 mole of various gases are as follows: hydrogen about 2 grams, helium about 4 grams, nitrogen about 28 grams, oxygen about 32 grams and carbon dioxide about 44 grams. On the average how fast does a molecule of each gas move at 333 Celsius?

    asked by Benny on April 6, 2010
  46. physics

    The masses of 1 mole of various gases are as follows: hydrogen about 2 grams, helium about 4 grams, nitrogen about 28 grams, oxygen about 32 grams and carbon dioxide about 44 grams. On the average how fast does a molecule of each gas move at 333 Celsius?

    asked by Plaster on April 7, 2010
  47. Programming

    Submit pseudocode and a flowchart for the following programming exercise: Fat Gram Calculator Design a program that asks for the number of fat grams and calories in a food item. Validate the input as follows: - Make sure the number of fat grams and

    asked by johnny on August 20, 2010
  48. Chemistry

    Elemental analysis of a compound, once used as a pesticide, was found to be 74.2% carbon, 8.64% hydrogen, and 17.2% nitrogen. This compound has a molecular mass of 162.23g/mol, what is the molecular formula for this compound?

    asked by Joe on November 16, 2016
  49. Science (check my answers)

    11. How do fossil fuels contribute to air pollution? A. By releasing carbon dioxide into the air*** B. By recycling oxygen C. By reversing the greenhouse affect D. By releasing nitrogen into the air

    asked by EmberShy on March 9, 2017
  50. chemistry

    A metal tank contains three gases: oxygen, helium, and nitrogen. If the partial pressu of the three gases in the tank are 5 atm of O2, 900 mm Hg of N2, and 1.4 kPa of He what total pressure inside of the tank?

    asked by karen on February 1, 2016
  51. Chemistry

    Calculate the moles of oxygen gas needed t burn 1.22 moles of ammonia, NH3(g). Find the moles of nitrogen dioxide gas and gaseous water produced.

    asked by franci on March 20, 2011
  52. Chemistry

    The hybridization of nitrogen in FNO3 (or FONO2) I cannot for the life of me draw the spin diagram for the NO single bonds and NO double bonds. Sp2 hybridization?? I think? N is forming 3 sigma bonds and one Pi.

    asked by Jen on April 20, 2018
  53. Chemistry

    In an experiment 2.750 g of magnesium is reacted with 2.571 g of oxygen gas according to the equation: Mg + O2 ==> MgO. What mass of the other reactant is in exess? You need equal number of moles of each. Which has the excess? moles Mg=2.750/molmassMg

    asked by Ashley on June 3, 2007
  54. Chemistry

    At what temp do hydrogen molecules, H2, have the same rms speed as nitrogen molecules, N2, at 455 C? At what temperature do hydrogen molecules have the same average kinetic energy?

    asked by Ted on October 23, 2012
  55. CHEMISTRY

    At what temp do hydrogen molecules, H2, have the same rms speed as nitrogen molecules, N2, at 455 C? At what temperature do hydrogen molecules have the same average kinetic energy?

    asked by Ted on October 23, 2012
  56. chemistry

    When 6 liter of nitrogen gas reacts with 18 liters of hydrogen gas at constant temperature and pressure, how many liters of ammonia gas will be produced?

    asked by braeden on April 19, 2015
  57. Chemistry Heat Capacity

    Is ΔCP for the reaction > 0 or < 0? Would an atmosphere of 20% carbon dioxide, 5% carbon monoxide, and 75% nitrogen oxidize nickel at 1000K? It is given that ΔG° = -66.62 KJ/mol, ΔH° = -48.93 kJ/mol, and ΔS = 17.69 J/ mol K

    asked by Joesph on November 17, 2016
  58. Chemistry

    5.88 moles of nitrogen and 16.2 moles of oxygen are mixed until the equilibrium is established, 11.28 moles of nitric oxide are formed calculate the value of equilibrium constant

    asked by Anon on May 11, 2016
  59. Chemistry

    5.88 moles of nitrogen and 16.2 moles of oxygen are mixed until the equilibrium is established 11.28 moles of nitric acid are formed calculate the value of equilibrium constant

    asked by Mohammad on April 4, 2016
  60. microeconimics

    one type of systematic error arises because people tend to think of benefits in percentage term rather than in absolute dollar amounts. as an example, samir is wiling to drive 20 minutes out of his way to save $4 on grocery item that cost $10 at local

    asked by lucy on July 10, 2015
  61. Biology

    I feel stupid, but seriously, I used to be better at Science than Math. Now it's the other way around. Bacterial DNA is (a) a closed loop (b) encased in a capsule (c) linear (d) found in the nucleus. The glycocalyx helps bacteria (a) survive unfavorable

    asked by Roslyn on April 8, 2010
  62. science

    Granite is an intrusive, felsic rock, which may be produced by partial melting or fractional crystillisation. Explain how these processes can produce felsic magmas from more mafic parent magmas. any ideas please Wouldn't the presence of magnesium and iron

    asked by Charley on April 10, 2007
  63. Chemistry

    My question is very simple Why do metals when react with oxygen are called oxides like " magnesium oxide" whereas non metals reacting with oxygen become dioxides like "carbon dioxides" , note that the two react with oxygen which has 2 molecules

    asked by Gap on October 1, 2007
  64. math

    The following table gives the free throws attempted (FTA) and the free throws made (FTM) for the top five players in the NBA for a recent season. Calculate the free throw percentage for each player by writing the FTM over the FTA and converting this

    asked by Danielle on February 20, 2008
  65. Chemistry

    A compound contains only hydrogen and nitrogen and is 12.6% hydrogen by mass. A gaseous sample of the compound has density of 0.925g/L at 690 torr and 110 degree Celsius. What is the molecular formula of the compound?

    asked by K on February 3, 2011
  66. chemistry

    do hydrogen bonds form between methanol (CH3OH) molecules? no, because methanol does not contain fluorine or nitrogen atoms yes, because methanol has a hydrogen attached to an oxygen atom may vary depending on the temperature

    asked by krystal on March 2, 2012
  67. chemistry

    A tank contains a mixture of 3.0 mol of nitrogen 2.0 mol of oxygen and 1 mol of carbon dioxide at 25 degrees and a total pressure of 10 ATM calculate the partial pressure in torr of each gas?

    asked by Lisa on January 20, 2012
  68. Chemistry

    Benzene, C6H6, reacts with nitric acid, HNO3. Two products are formed, one of which is water. The second product has a molar mass of 213 grams. The second product is composed of 33.8% carbon, 1.42% hydrogen, 19.7% nitrogen, and 45.1% oxygen. Write a

    asked by Melissa on April 18, 2015
  69. Chem Help Please!!!

    For each of the pairs of elements below give the formula for the simplest compound to be formed from them and explain the basis of your decision and note if the bond(s) formed are ionic or covalent. a) sodium and fluorine b) nitrogen and hydrogen c)

    asked by Kim on August 26, 2014
  70. Science (Chemistry)

    An organic compound contains 49.2% Carbon, and 9.68% Hydrogen and 19.19% Nitrogen. If Molecular Mass of compound is 146. Calculate the Molecular Formula of compound.

    asked by Sushant on July 27, 2017
  71. physic II

    Two liters of a perfect gas are at 0 degree C and 1 atm.If the gas is nitrogen, N2. Determine the number of moles? Determine the mass of the gas?

    asked by 34 on April 15, 2014
  72. science

    Burning fossil fuels like natural gas and coal releases___. a.)trapped air layers b.) nitrogen, oxygen, and carbon compounds c.)sulfurous smog d.) ultraviolet radiation confused a little... do not understand what Sulfurous smog is? thank you

    asked by Science finial study guide on May 18, 2009
  73. Chemistry

    N2 + O2 -> 2NO enthalpy change = +180.6kJ c) what is the enthalpy change for the formation of one mole of nitrogen monoxide? Okay, I know this question is super easy, but I don't know how to do it; if someone could please give me a detailed explaination on

    asked by A Canadian on February 6, 2013
  74. math (statistics)

    The following table shows the percentage of individuals in each age group who use an online tax program to prepare their federal income tax return. AGE ONLINE TAX PROGRAM (%) 18-34 16 35-44 12 45-54 10 55-64 8 65+ 2 Suppose a follow-up study consisting of

    asked by sarah on February 10, 2015
  75. physics

    If one proton and one neutron are added to the nucleus of a nitrogen atom, which atom will the new nucleus look like

    asked by Anonymous on March 3, 2012
  76. applying stoichiometry

    nitrogen + hydrogen----------> ammonia How many grams of ammonia can produced from 3.47 moles of hydrogen?

    asked by danielle on February 5, 2012
  77. Statistics

    Suppose that you are designing an instrument panel for a large industrial machine. The machine requires the person using it to reach 2 feet from a particular position. The reach from this position for adult women is known to have a mean of 2.8 feet with a

    asked by Lamont Sanford on August 5, 2014
  78. Chemistry

    Calculate the molar concentration for each of the following. a)The concentration of a brine solution containing 225 g for pure sodium chloride dissolved in 4.00 L of solution. b)The volume that must be added to 4.2 mol of magnesium chloride to make a 0.045

    asked by Lyn on November 22, 2015
  79. chemistry

    a compound contains 5.2% by mass Nitrogen. It also contains carbon, hydrogen and oxygen. Combustion of 0.085g of the compound produced 0.224g of carbon dioxide and 0.0372g of water. Calculate the empirical formula of the compound.

    asked by martina on October 8, 2013
  80. chemistry

    A) what is the molar fraction of each gas in a mixture of 6g of hydrogen H2 and 7g of nitrogen N2 ? B) what is the total pressurd exerted by the above mixture in a volume of 15 l at a temperature of 0ºc ? C) what is the partial pressure of each gas in the

    asked by angy on May 30, 2016
  81. Physics

    31m/s is a typical highway speed for a car. At what temperature do the molecules of nitrogen gas have an rms speed of 31m/s? T=[(x^2)*m]/3k so x=31m/s m=N2=2*14=28g=.028kg k=1.38e^-23..I'm keep getting 6.333651477e^10...which is incorrect. What am I

    asked by ana on November 20, 2009
  82. Chemistry

    Under SATP, magnesium was reacted with acid and 500mL of hydrogen gas was collected over water a) What is the vapour pressure of water? b) What is the pressure of hydrogen gas? c) What amount of hydrogen was produced?

    asked by Anonymous on June 5, 2018
  83. math

    Kara was interested in going to the mall to buy some new clothes. Once she got there she purchased two shirts that cost $13.42 total. If she started out with $40.00, what percentage of her money did she spend

    asked by jason on February 28, 2018
  84. History

    1. Though they are a small religious group in India, they control a large percentage of their economy. A. Hindus B. Sufis C. Christians D. Parsis E. Jews A?

    asked by Anonymous on January 7, 2016
  85. Algebra

    Need help with this: 39. Money in a bank account that compounds interest by some percentage acts _____ a. linearly b. exponentially c. negatively d. like a fraction I'm stuck between A or B... Thanks -MC

    asked by mysterychicken on June 19, 2010
  86. modern physics

    Supersonic jets are able to achieve maximum speeds of up to 3.0 × 10-6c. Calculate the percentage contraction in the length of a jet plane travelling at this speed.

    asked by gourav on March 21, 2017
  87. physical chemistry

    This question is about a lab called Heats of Ionic Reaction in my Physical Chemistry class. I need to know why there should be a large percentage error in deltaH4

    asked by shelby on March 5, 2013
  88. Child care

    After establishment of your child care center, equipment and supplies will comprise what percentage of your annual operating budget? A .5% to 1.5% B 1.5% to 3% C 3% to 5.5% D 5.5% to 7% The correct answer is C

    asked by Rosa on November 16, 2009
  89. modern physics

    Supersonic jets are able to achieve maximum speeds of up to 3.0 × 10-6c. Calculate the percentage contraction in the length of a jet plane travelling at this speed.

    asked by gourav on March 19, 2017
  90. chemistry

    the half time of a radioisotope is found to be 4.55 minutes. if the decay follow first order kinetics. what percentage of isotope will remain after 2.00 hours?

    asked by Linda Nnenna on March 28, 2017
  91. Math

    Create a graph from this research In a recent article, the author states that 71% of adults do not use sunscreen. Although 71% is a large percentage, explain why it could be misleading.

    asked by Linda on February 23, 2012
  92. Physics

    A monoatomic gas expands isobarically.What will be the percentage of heat supplied that increases the thermal energy and that involved in doing work for expansion?

    asked by Tulika on April 9, 2012
  93. chemistry

    The atomic mass of chlorine is listed as 35.454 amu on the periodic table. It has two naturally occurring isotopes, CI-35 and CI-37. What are the approximate percentage of each?

    asked by Sara on September 20, 2012
  94. science grade 9

    If humans and all other animals are constantly producing carbon dioxide, and is a very stable gas, why does it make up only a tiny percentage of the earths atmosphere?

    asked by Jalen on November 27, 2009
  95. SCIENCE

    3) You add 36 g of MgSO4 to pure water to a final volume of 200 mL. What concentration of solution did you make ? Express the results as percentage, % (w/v).

    asked by LIN on February 5, 2017
  96. Business Math

    What is the annual percentage yield of a $10,000 investment for 1 year at 12% interest compounded monthly? (Round APY to the nearest hundredth.)

    asked by Tee on July 3, 2013
  97. chemistry

    If a reaction has a percentage yield of 83.0%, what mass of methane can be obtained from 1150 g of carbon? 2 C(s) + 2 H2O(l) CH4(g) + CO2(g) *Answer in grams*

    asked by Jagoda on February 16, 2015
  98. chemistry

    describe how you can prepare 500cm of0.1m of standard hydrochloric acid from commercial concentrated HCL of density 1.18g/cm and percentage by 37%

    asked by Anonymous on March 13, 2015
  99. Chemistry

    Each Rolaid tablet contains 550mg of calcium carbonate and 110mg of magnesium hydroxide. Kroger Extra Strength antacid tablets contain 750mg of calcium carbonate per tablet. What is the neutralizing ability per gram for each tablet? Your answer should be

    asked by Anonymous on March 15, 2010
  100. Math

    Please help The following table gives the free throws attempted (FTA) and the free throws made (FTM) for the top five players in the NBA for a recent season. Calculate the free throw percentage for each player by writing the FTM over the FTA and converting

    asked by Trina on February 20, 2008