1. Algebra

    Tim works part-time at a retail store. His salary varies directly by the number of hours worked. Last week he earned $99.45 for 13 hours of work. This week he earned $160.65. a. Write and solve an equation that represents this scenario. b. How many hours

    asked by Willy on February 10, 2014
  2. Algebra 2

    A rental car costs a minimum charge plus a fixed charge per mile driven. One customer was charged $60 for 160 miles of use. Another customer drove 280 miles and paid $90. Write an equation relating the total cost, C (in dollars), to the miles driven, x.

    asked by Anonymous on October 14, 2007
  3. Science

    Do you know how big the Sun is? The Sun is 400 times as big as the Moon and 400 times as far away. The Moon: 2.5mm diameter a) How big would the Sun be if the Moon were the size shown above? b) The Sun is actually about 865,000 miles in diameter, so 1 cm

    asked by luca on January 9, 2009
  4. Chem

    Three bulbs are connected by tubing, and the tubing is evacuated. The volume of the tubing is 32.0 mL. The first bulb has a volume of 78.0 mL and contains 2.72 atm of argon, the second bulb has a volume of 250 mL and contains 2.83 atm of neon, and the

    asked by Anonymous on October 10, 2012
  5. Chemistry- Dr.Bob

    1. Oxygen (O2) is about 20% of our air, with about 80% nitrogen and a bunch of minor components. In Colorado Springs, where I grew up, the elevation is ~ 6500 feet and atmospheric pressure is only around 12 psi (vs. 14.7 psi at sea level). Under those

    asked by Sanaya on January 20, 2016
  6. Maths

    Grandpa places money in an account on your first birthday and will place that same amount in the account every year, ending with your 18th birthday. So there is a total of 18 deposits starting on first birthday. He expects to earn 8% interest per year. How

    asked by Sejul on February 12, 2014
  7. Chem

    If you start with 3.500 g of ZnSO4 (Zinc Sulfate) & 7 H2O and heat it for 10+ minutes to remove the water of hydration, what will be the mass of water removed? Hint: Since you know the number of grams of hydrated salt present you then know the number of

    asked by Angie on February 18, 2007
  8. math

    8 basketball players are selected to play in a special game.the players will be selected from a list of 27 players .if the players are selected randomly ,whats the probability that the 8 tallest players will be selected.

    asked by rency on October 27, 2009
  9. physics....

    1) Yellow light that has a wavelength of 560 nm passes through two narrow slits that are 0.300 mm apart. An interference pattern is produced on a screen 160 cm distant. What is the location of the first-order maximum? 2) A communication satellite is

    asked by kennedy on June 12, 2012
  10. Maths

    A pedestal is constructed in the form of frustum of a pyramid, the sides of the square ends of the frustum being 360cm and 160 cm and slant height 260cm. Find volume , lateral surface area including area of the top and the cost of construction @ rs.50

    asked by Chaitanya on February 6, 2016
  11. Chemistry

    If an Alka-Seltzer tablet has a mass of 4.953 g, and an Erlenmeyer flask containing an HCl and water solution weighs 160.351 g, what is the percent by mass of NaHCO3,in the tablet if the Erlenmeyer flask and its contents weigh 164.027 g after reaction?

    asked by Me on January 25, 2011
  12. Math

    An object is projected directly upward from the ground. Its distance in feet from the ground in t seconds is s equals s=112t−16t^2 The object will be 160 feet from the ground after () ​second(s) and after () ​second(s). The object strikes the ground

    asked by Greg on April 18, 2016
  13. chemistry

    6.70 A sample of benzene, C6H6, weighing 3.51g was burned in an excess of oxygen in bomb calorimeter. The temperature of the calorimeter rose from 25.00C to 37.18C. If the heat capacity of the calorimeter and contents was 12.05kJ/C, what is the value of q

    asked by Capacino on June 25, 2009
  14. Chemistry

    Question: At 300 K,Carbon powder and O2 are included in container of 10dm3.When the system is heated well,all the O2 converts into CO2.Then the system is cooled to the initial temperature. The volume of the Carbon powder is negligible. Find the percentage

    asked by Shenaya on June 8, 2017
  15. Physics0

    The currently accepted maximum depth limit for safe scuba diving while breathing air is 50 metres. What is the absolute partial pressure of oxygen at this depth? my solution was as the following, please correct me if I'm wrong: P=F/A Thus the pressure

    asked by Adam on August 14, 2017
  16. Chemistry

    What volume of 0.25 mol L-1 sodium nitrate solution could be prepared using 6.00 moles of compond?

    asked by Jacob Paul on November 27, 2012
  17. chemistry

    Calculate the number of Li atoms in 3.0 moles of Li. Express your answer using two significant figures.

    asked by rolando on October 18, 2016
  18. science: chemistry

    How many moles of NaOH must be added to 1.0 L of 2.6 M HC3H5O3 to produce a solution buffered at each pH? 1)pH= 4.28 2)pH=pKa

    asked by Julie on July 23, 2015
  19. chemi

    Calculate the moles of Cu in 8.4×1021 atoms of Cu. Express your answer using two significant figures.

    asked by rolando on October 18, 2016
  20. chemistry

    Concentrated sulfuric acid (18.3 M) has a density of 1.84 g/mL. How many moles of H2SO4 are in each milliliter of solution?

    asked by Anonymous on September 29, 2013
  21. chemistry

    A 2.50X102 g sample of an unknown hydrocarbon contains 3.28X101 g of hydrogen. How many moles of carbon does it contain?

    asked by angie on October 20, 2010
  22. college chem

    How many moles of O are needed to combine with 0.223 mole of C to form the following compounds? CO CO2

    asked by tay on September 15, 2011
  23. Chemistry

    How many moles of Carbon dioxide are produced from the decompostion of 1.45 grams of Aluminum Carbonate?

    asked by Barb on February 24, 2008
  24. chemistry

    What is the concentraton of a solution made by dissolving 0.5 moles of solute in 9.0 liters of water?

    asked by Juliettte on March 5, 2011
  25. chemistry

    how many totsl moles of ions are released when 0.83 mol of K3PO4 dissolves in water?

    asked by samm on October 28, 2009
  26. Chemistry

    P4 + 5O2 P4O10 , 1.5 moles of product were made in 30 seconds. What is the rate of reaction?

    asked by Joe on February 19, 2014
  27. science

    If 2.7 moles of copper metal was deposited from a solution of Cu(NO3)2, how many electrons were involved?

    asked by Andrea on April 18, 2013
  28. chem

    How many moles of S are needed to combine with 0.208 mol Al to give Al2S3? break it down thanks

    asked by jack on February 14, 2018
  29. Chemistry

    Calculate the number of moles in these quantities. 1. 25.0 g KNO3 2. 5.4 x 102 g (NH4)2C2O4

    asked by Netta on March 20, 2011
  30. chem

    how many moles of water are present in one mole of zinc sulphate and write the formula for this?

    asked by Anonymous on April 27, 2011
  31. chemistry

    how many moles of butane gas c4h10 react to produce 3.50moles of water?

    asked by tracey on November 4, 2010
  32. Chemistry

    How many moles of Cacl are needed to be dissolved in .500g of H2O to form a 1.5m solution?

    asked by Ty on March 24, 2010
  33. chemistry

    How many moles of sulfate ions are in 100 ml of a solution of .002 M Fe2(SO4)3?

    asked by Moyer on March 19, 2013
  34. chemistry

    Molarity is defined as the number of moles of solute divided by the volume of the solvent

    asked by Anonymous on December 5, 2011
  35. Chemistry

    How many moles of magnesium sulfate are needed to make in a solution of 0.10g Mg2SO4?

    asked by Rena on February 26, 2013
  36. chemistry

    How many moles of Cu2+ ions are present in 1L of .125M CuSO4:5H2O solution?

    asked by sarah on April 24, 2018
  37. Science

    Calculate the number of moles of hydrogen gas that would be displaced from 52grams magnesium

    asked by Faithful on October 10, 2016
  38. chem

    What is the mass in grams in Br in 7.20 moles of FeBr2?7.20 mol FeBr2x215.65=1552.68=1553 g/m

    asked by Claudett2 on September 30, 2014
  39. chemistry

    if 8 moles of fructose are fermented and 320g of ethanol is obtained,what is the yield of the fermentation

    asked by soffy on October 25, 2014
  40. Chemistry

    What do I need from the data i collected from my experiment to get... moles of CaC2O4xH2o (or CaC2O4) percipitated (mol)

    asked by Dana on March 14, 2011
  41. chemistry

    Calculate the number of moles of each ion in 10.5 mL of 0.205 M cadmium phosphate solution.

    asked by student on January 22, 2012
  42. chemistry

    if the molar mass of BaCl2 is 208.3 g/mol, how many grams are present in 0.25 moles?

    asked by sam on March 19, 2013
  43. chemistry

    1.) 1.25 moles of an ideal gas are contained in 8.0L. If the temperature is 33K, what is the volume at STP?

    asked by xx on November 17, 2014
  44. chemistry

    What is the volume, in L, occupied by 3.260 moles of NO2 gas at STP conditions?

    asked by Mindy on July 28, 2015
  45. physical science

    calculate the number of moles of H2SO4 wich were added to the NaOH solution

    asked by gill on September 30, 2013
  46. chemistry

    Calculate the number of moles of each ion in 10.5 mL of 0.205 M cadmium phosphate solution.

    asked by diana on January 22, 2012
  47. Chemistry

    How many moles of NH4Cl must be added to 1.5L of 0.2 M solution of NH3 to form a buffer whose PH is 9.(Kb=1.8x10^-5)

    asked by Zekariyas on December 7, 2017
  48. Organic Chemistry

    How many moles of hypochlorous acid are needed to react with 0.621 mol of 9-fluorenol? please help

    asked by Timmy on February 1, 2012
  49. Chemistry

    2.01 g of sodium sulfate How would I figure out the number of moles of sulfure atoms in that sample?

    asked by TAG on February 23, 2008
  50. Chemistry

    how can i find out how many moles of oxygen are in 9.85g of (NH4)2CO3 ? i want to know what steps to take and in what order.. please help

    asked by michelle on June 24, 2011
  51. Chemistry

    If a solution contains 0.65mol of OH−, how many moles of H+ would be required to reach the equivalence point in a titration?

    asked by Will on November 16, 2014
  52. Chemistry

    How much H3PO4 is needed to neutralize 1 liter of a 0.75M solution of NaOH? (in moles)

    asked by Damon on July 26, 2016
  53. Chemistry

    What mass of carbon dioxide is released by heating 2 moles of calcium carbonate?

    asked by Apphia Lord on May 30, 2015
  54. Physiological Chemestry

    How many grams of ethanol(C2H60) are formed from .550 moles of sucrose(C12H22O11)?

    asked by Lyndsie on November 10, 2014
  55. chemisty

    Calculate the moles of Cu in 8.4×1021 atoms of Cu. Express your answer using two significant figures.

    asked by rolando on October 18, 2016
  56. chemistry

    how many moles of ions are released when 1.6 mol of ammonium phosphate is dissolved in water?

    asked by Amber on October 10, 2010
  57. Chemistry

    How many moles of chlorine atoms are present in 4.8x10^20 molecules of carbon tetrachloride?

    asked by Anonymous on September 2, 2014
  58. chemistry

    what is the minimum of amount of KCN in moles needed to extract 29 grams of gold

    asked by Anonymous on November 5, 2012
  59. chemistry

    How do i find the change in the moles gas for a reaction? example MgCO3 = MgO +CO2

    asked by Shea on November 1, 2010
  60. Chemistry

    Calculate ΔGo (in J) for 2 moles of electron(s) in each half-reaction and a standard potential of 0.57 V.

    asked by JUNDY on April 12, 2015
  61. science

    How do you find the total kinetic energy...What formula do I use. I am given moles, volume, and temp.

    asked by Nisha on October 21, 2009
  62. chemistry

    Suppose you have 19.2 g of Cu. What number of moles of Cu is present? Report your answer to 3 signifiant figures.

    asked by kenya on March 22, 2013
  63. Chemistry

    How many moles of oxygen will occupy a volume of 2.5 liters at 1.2 atm and 25 degrees celcius

    asked by Cecilia on February 28, 2010
  64. chemistry

    How many moles of O are needed to combine with 0.223 mole of C to form the following compounds? CO CO2

    asked by tay on September 15, 2011
  65. Chemistry

    Calculate Keq for 2 moles of electron(s) in each half-reaction and a standard potential of 0.55 V.

    asked by JUNDY on April 12, 2015
  66. chemistry

    The formula for rust can be represented by Fe2O3. How many moles of Fe are present in 24.6 g of the compound? Please guide me through it thank you!

    asked by Michelle on July 28, 2015
  67. chemistry

    You need to find the number of moles in 5mL of a substance given the density and the molecular weight. How do you do this?

    asked by Max on April 15, 2010
  68. chemistry

    Calculate the number of moles of FeSO4 in 25cm3 of a 0.2mol dm3 solution

    asked by Richard on June 21, 2011
  69. chem

    How many moles of CoCO3 are there if sample has 2.84 times 10 to the 16th power carbonate particles

    asked by punkin on November 29, 2012
  70. chemistry

    How many moles of ammonia gas can be produced from the reaction of 3.0L of N2 and 3.0L of H2 according to the following equation: N2(g) + 3H2(g)---> 2NH3(g)?

    asked by jerome on March 8, 2011
  71. chemistry

    How many moles are contained in 3.25 L sample of an ideal gas at 25oC and 204 kPa?

    asked by linda on May 5, 2015
  72. Chemistry

    What is the pH of a one liter auqueous solution to which has been added 0.2 moles of acetic acid (CH3COOH)?

    asked by Chris on January 23, 2011
  73. chemistry

    1.) 1.25 moles of an ideal gas are contained in 8.0L. If the temperature is 33K, what is the volume at STP?

    asked by xx on November 19, 2014
  74. chemisty

    calculate the molarity of a solution with .2 moles of sodim hydroxide dissolved in .5L of water

    asked by Anonymous on April 27, 2011
  75. chemistry

    How many moles of HNO3 are present if 0.236mol of Ba(OH)2 was needed to neutralize the acid solution?

    asked by Anon on August 6, 2012
  76. Chemistry

    How would I find the volume occupied by 3 moles of N2 at zero degrees and 101.325 kPa?

    asked by anonymous on December 10, 2007
  77. Chemistry

    I am trying to find th e# of moles of NaCl but I am not sure of the units. For my answer I get 0.0669. Should I leave it like this or do 6.69e-2?

    asked by Hannah on February 20, 2012
  78. Physics

    A gas initially occupies 4.5L at 350k and 22kPa. How many moles and molecules are present?

    asked by Simmo on May 9, 2017
  79. Chemistry

    the molar mass of triolein is 885 g/mol, how may moles of CO2 molecules do i have

    asked by Bren on December 21, 2014
  80. chemistry

    if 4.4 moles of copper metal was deposited from a solution of Cu(NO3)2, how many electrons were involved?

    asked by scott on November 21, 2011
  81. chemistry

    2NaClO2---> 2NaCl + 3O2 if 3.85 grams of NaClO3 react, how many moles of O2 are created?

    asked by Kai on December 11, 2012
  82. Chemistry

    Calculate the number of moles of solute in 497.2 L of 0.815 M sodium cyanide?

    asked by Aly on June 29, 2017
  83. chemistry

    How many moles of ammonium chloride could be found in 100g of water at 70 degrees celsius?

    asked by Sarah on November 21, 2011
  84. Chemistry

    Zinc - .5 grams HCl- .2 moles Find the Mass of ZnCl2 [How would you solve this?]

    asked by Derrick on November 19, 2015
  85. chemistry

    if the concentration of NO3- in the water is uniformly 5 microMolar, how many moles of N are there per square meter?

    asked by lizzy on September 9, 2008
  86. chemistry

    if the concentration of NO3- in the water is uniformly 5 microMolar, how many moles of N are there per square meter?

    asked by Nelly on September 8, 2008
  87. chemistry

    if+all+nitrogen+atoms+from+.1+mole+No2+and+.2+N2o4+are+removed+then+how+many+moles+of+n2+can+be+prepared+from+it

    asked by sonu on June 5, 2014
  88. CHEMISTRY

    If a tablet contains 129 mg of Mg(OH)2 and 505 mg of CaCO3, how many moles of HCl would theoretically be neutralized?

    asked by Jo on April 22, 2013
  89. Chemistry

    DrBobb22 Calcule the concentrations of Cd^+2 , [Cd(CN)4^-2] and CN^- at equilibrium, when 0.42 moles of Cd(NO3)2 dissolves in 1 L of 2.50 M NaCN Kf for Cd(CN)4^-2 Help!

    asked by David on May 5, 2016
  90. Chemistry

    If 355 g Al(NO3)3 reacts with an excess of K2CrO4, how many moles of KNO3 would be produced?

    asked by Michelle on December 12, 2012
  91. science

    decomposing 0.00153 moles cholesterol will release what volume of hydrogen atoms?

    asked by cris on October 12, 2012
  92. Chemistry

    2C2H6 + 7O2 → 4CO2 + 6H2O what equivalences can you write in terms of moles and why ?

    asked by TRH on October 19, 2017
  93. Chemistry

    How many moles of oxygen molecules would be produced from the decomposition of 25moles of potassium trioxochlorate (v) ?

    asked by Mikeshontel on March 27, 2012
  94. Chemistry

    What is the concentration when each of the following is dissolved in 1.50 L of water: a) 3.00 moles of NaCl b) 10 g of KCl c) 110 mg of NaCO3

    asked by Melanie on September 24, 2015
  95. chemistry

    calculate the moles of solute present in 1.25 centimeter cube of 0.5 M h3po4 solution

    asked by hifsa on June 19, 2014
  96. Chemistry

    How many moles of CaCl2 are produced when this reaction is started with 4.70 grams of chlorine gas?

    asked by Elizabeth on November 19, 2013
  97. Chemistry

    how many moles of iron would have been used up if 45.0g of copper were to be produced? is it # mols Fe = 45.0gCu x 1mol/63.5g = 0.709molFe ?

    asked by Lily on December 10, 2008
  98. Chemistry

    give a formula you can use to calculate the number of moles of H+ ions used at the equivalence point.

    asked by Emma on October 26, 2011
  99. chemistry

    if all the oxygen from 1.8 gram glucose and 9.8 H2So4 are removed and converted to o2 how many moles are prepared?

    asked by tanvir on June 5, 2014
  100. chemistry

    How many moles of hydrogen would be obtained if 2.7g of aluminium reacts with excess hydrochloric acid?

    asked by Serena on March 5, 2015