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Homework Help: Help with balancing equations.

  1. Sep 24, 2008 #1
    I completed these, and I wanted to check if I did them correctly.

    A)Write and balance equations for these reactions:
    1.zinc + mercurous nitrate -->
    Zn + 2HgNO3 -> Zn(NO3)2 + 2Hg

    OR
    2Zn + Hg2(NO3)2 -> 2Hg + ZnNO3

    2.tin + antimony (V) chloride -->
    Sn + SbCl4 -> Sb + SnCl4

    3.calcium carbonate + hydrobromic acid -->
    CaCO3 + 2HBr -> CaBr2 + CO2 + H2O
    I had alot of difficulty with this one, not sure if I am close.


    B)
    1. How many grams of sulphuric acid will neutralize 10.0g of sodium hydroxide?
    I figured out the answer for this as 12.3 g of sulphuric acid but im having problems with part 2.

    2. What volume of water vapour at 100 'C and 110kPa would also be produced?
    p = 110000 / 101325 = 1.09 atm
    V = nRT / p
    = 0.25 x 0.0821 x 373 K/ 1.09
    = 7.02 L

    Thanks.
     
  2. jcsd
  3. Sep 24, 2008 #2
    Except for a mistake on the second look at the first one (how many zincs are on the LHS compared to the RHS?), everything seems okay to me.
     
  4. Sep 24, 2008 #3
    Thanks. So would this be correct?
    Zn + 2HgNO3 -> Zn(NO3)2 + 2Hg
     
  5. Sep 25, 2008 #4

    Borek

    User Avatar

    Staff: Mentor

    This is correctly balanced, but I would write mercury (I) nitrate as Hg2(NO3)2. Mercury (I) comes as diatomic cation Hg22+.
     
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