Homework Help Forum: Chemistry

Posted by Alex on Thursday, June 4, 2009 at 10:36pm.

1.The Volume of oxygen required for the complete combustion of 500ML of ethyne at STP..A)2.00ML B)1.25 C)1.71 D)1.00 2.A Chemical Engineer finds that 250ml CuSO4 reacts with excess NaOH to create 2.37g of precipitate.Calculate the Concentration of copper(II) Sulphate solution. 3.Propane is a useful fuel for camping.If 50.0L of propane undergoes complete combustion at STP.Calculate the volume of water vapour produced at STP. 4.How many grams of calcium chloride can be prepared if a student uses 500g if calcium carbonate and 2.00L of a 4.00 Mol/L sodium chloride solution in the reaction. 5. 2KMnoO4 + 5 H2C2O4<----need to use this Concentration of 0.24L KMnO4 solution required to oxidize 2.7g of Oxalic Acid??? 6.What volume of 0.100mol/L aqueous sodium hydroxide(NaOH) is neutralized by 500ml of 0.200mol/L hydrochloric acid(HCI) 7.When 10.0g of potassium chlorate,KCIO3,decomposes,what volume of oxygen is obtained(at 18C and 750 mm HG pressure) 8. 2(NH4)3PO4-->3N2+O2+12H2+2PO3 a)name products b)Name the reactant c)type of reaction

• Chemistry - Alex, Thursday, June 4, 2009 at 11:41pm

  Someone plz help..i have been working on it for 2 hours..i dont get this..HELP

  
  

• Chemistry - MathMate, Friday, June 5, 2009 at 12:25am

  1.The Volume of oxygen required for the complete combustion of 500ML of ethylene at STP..A)2.00ML B)1.25 C)1.71 D)1.00 The balanced equation of the combustion: 2C2H2 + 5O2 -> 4CO2 + 2H20 tell us that 2 volumes of ethylene reacts with 5 volumes of oxygen. Answer : B. 1.25 litre 2.A Chemical Engineer finds that 250ml CuSO4 reacts with excess NaOH to create 2.37g of precipitate.Calculate the Concentration of copper(II) Sulphate solution. CuSO4 + 2NaOH -> Na2SO4 + Cu(OH)2 Molecular weight of CuSO4 = 159.546 THerefore there are 2.37g/159.546=0.1485 mol in 500 ml. Thus the concentration of CuSO4 is 0.0297 mol/litre.

  
  

• Chemistry - MathMate, Friday, June 5, 2009 at 12:33am

  3.Propane is a useful fuel for camping.If 50.0L of propane at STP undergoes complete combustion.Calculate the volume of water vapour produced at STP (?). NOTE: water vapour condenses below 100 deg. The volume calculated is the converted equivalent of water vapour at STP. C2H8 + 7O2 -> 3CO2 + 4H2O Thus each volume of C2H8 produces 4 volumes of water vapour. So 50 litres of propane produces 200 l. of water vapour.

  
  

• Chemistry - Alex, Friday, June 5, 2009 at 1:27am

  Thank you sooooo much MathMate your the best!!!!if u have time can u help me out on #4 and 5 too////Thanks man

  
  

• Chemistry - MathMate, Friday, June 5, 2009 at 7:50am

  Glad to help, but it would be easier for me if you show me some of your work so I can better help you!

  
  

• Chemistry - Alex, Friday, June 5, 2009 at 3:42pm

  for #3.Do u suppose to use STP????

  
  

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