Did I Balance These Chemical Equations Correctly?

[greg153]

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 a lot 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 I am 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.

 

[Mindscrape]

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.

 

[greg153]

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.

Thanks. So would this be correct?
Zn + 2HgNO3 -> Zn(NO3)2 + 2Hg

 

[Borek]

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