Help with Chemical Equations - Mn(NO3)2, MnO2, H2O2, O2

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Discussion Overview

The discussion revolves around the chemical reactions involving manganese compounds, specifically Mn(NO3)2 and MnO2, in the context of decomposition and reactions with hydrogen peroxide (H2O2). Participants seek clarification on the products formed and the balanced equations for these reactions.

Discussion Character

  • Debate/contested
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant questions the identity of gas J produced from the decomposition of Mn(NO3)2, suggesting it could be either N2O4 or 2NO2.
  • Another participant asserts that gas J is indeed NO2, mentioning its potential dimerization to N2O4.
  • There is uncertainty regarding the products of the reaction between MnO2 and H2O2, with one participant proposing Mn(OH)2 might be formed, while another insists that water is produced instead.
  • One participant clarifies that MnO2 acts as a catalyst and does not change during the reaction.
  • Participants discuss the balanced equation for the reaction involving MnO2 and H2O2, with suggestions for different formulations, including the presence of MnO2 as a catalyst in the equation.
  • Another participant provides a simplified equation for the decomposition of hydrogen peroxide, indicating the formation of water and oxygen.

Areas of Agreement / Disagreement

Participants express differing views on the products of the reactions and the correct balanced equations, indicating that multiple competing perspectives remain without consensus.

Contextual Notes

There are unresolved questions regarding the exact products formed in the reactions, the role of MnO2, and the correct balanced equations, which depend on the interpretations of the chemical processes involved.

DarylMBCP
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Hey guys, I nd sme help with sme chemical equations that I hve. I've tried different sources but they seem to be contradicting each other. Please help.

1. When Mn(NO3)2 is heated, MnO2 and a brown gas J are formed through decomposition. What is gas J?

I tried to cancel out the similar element that were in MnO2 from Mn(NO3)2 to get N2O4. However, is that gas J or is it 2NO2?

2. MnO2 is added to H2O2. A colourless gas P was released and was found to rekindle a glowing splinter. What is gas P and construct a balanced equation to show the chemical reaction.

I knw that gas P is Oxygen but I'm not sure abt the other products so I'm not rlly sure abt the balanced equation. I think this is it though;
MnO2 + 2H2O2 --> 2O2 + 2H2O + Mn

It shld be correct. Any help is rlly appreciated.
 
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1) J is indeed NO2. (NO2 can dimerise to give N2O4, but that's besides the point)

2) I think you'll actually be getting Mn(OH)2 out of it, but I could be wrong.
 
Hey there, I don't rlly think Mn(OH)2 is formed cos. I'm quite sure that H2O is formed. However, I'm not rlly sure. Thnks for the help though.
 
MnO2 just catalyze the reaction - it doesn't change.
 
Wait a minute, so MnO2 remains as a product? Pls be clearer, by possibly suggesting another balanced equation if mine is wrong. Thanks.
 
Hydrogen peroxide decomposes to water and oxygen.
 
Woah, so the balanced eqn. is actually;

MnO2 + 2H2O2 --> O2 + 2H2O + MnO2 ?
 
Just 2H2O2 -> 2H2O + O2

You may put MnO2 over reaction arrow, to signal catalyst presence.
 
K, thnks vey much for the help.
 

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