1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

    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.

    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

  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


    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+.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook