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

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The discussion focuses on the chemical reactions involving manganese compounds, specifically Mn(NO3)2 and MnO2. When Mn(NO3)2 is heated, it decomposes to produce MnO2 and nitrogen dioxide (NO2), which can dimerize to form dinitrogen tetroxide (N2O4). Additionally, when MnO2 is mixed with hydrogen peroxide (H2O2), oxygen gas (O2) is released, and the balanced equation for this reaction is MnO2 + 2H2O2 → 2H2O + O2, with MnO2 acting as a catalyst and remaining unchanged.

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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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