Did I Balance These Chemical Equations Correctly?

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Discussion Overview

The discussion revolves around the balancing of chemical equations and the calculations related to neutralization reactions. Participants evaluate the correctness of balanced equations for various chemical reactions and address related stoichiometric calculations.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • Post 1 presents several chemical reactions to balance, including reactions involving zinc, tin, and calcium carbonate.
  • Participants question the balancing of the first equation, specifically the number of zinc atoms on the left-hand side compared to the right-hand side.
  • One participant suggests that the balanced equation for the first reaction should be written as Zn + 2HgNO3 -> Zn(NO3)2 + 2Hg.
  • Another participant points out that mercury (I) nitrate should be represented as Hg2(NO3)2 due to the diatomic nature of the mercury (I) cation.

Areas of Agreement / Disagreement

There is some agreement on the correctness of the balanced equations, but there are also corrections and clarifications regarding the representation of certain compounds. The discussion remains somewhat unresolved regarding the initial balancing of the first equation.

Contextual Notes

Participants express uncertainty about the balancing of specific equations and the stoichiometric calculations, particularly in the context of the first reaction involving zinc.

Who May Find This Useful

This discussion may be useful for students or individuals interested in chemistry, particularly those learning about balancing chemical equations and stoichiometry.

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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.
 
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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.
 
Mindscrape said:
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
 
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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