The answer to your question:
1.88 moles Na is 43.22 grams
The decomposition reaction for hydrogen peroxide is given below:
2
→ 2
O + 
This is a decomposition reaction.
Reactions in which a reactant breaks into two or more products are known as Decomposition reactions.
AB → A + B
here, AB represents the reactant that begins the reaction, and A and B represent the products of the reaction
The decomposition reaction of decomposing hydrogen peroxide is exothermic. When the hydrogen peroxide undergoes a decomposition reaction, heat is also released along with water and oxygen.
Hence the reaction for decomposing hydrogen peroxide is :
2
→ 2
O + 
If you need to learn more about Decomposition reaction, click here
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Nuclear fission is used enable to release energy in power plants. The constant collision of particles within the reactor, create most of the plants energy.
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