The law of conservation of Matter [HELP]

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SUMMARY

The law of conservation of matter states that the mass of a closed system remains constant, regardless of the processes occurring within it. This principle parallels the law of conservation of energy, emphasizing that matter cannot be created or destroyed, only transformed. For example, in the combustion reaction of ethanol (C2H5OH + 3O2 -> 3H2O + 2CO2), the total mass before and after the reaction remains unchanged when contained in a closed flask. In contrast, an open system allows for the exchange of matter, thereby invalidating this law.

PREREQUISITES
  • Understanding of closed and open systems in physics
  • Basic knowledge of chemical reactions and stoichiometry
  • Familiarity with mass balance concepts
  • Knowledge of combustion reactions and their products
NEXT STEPS
  • Research the implications of the law of conservation of mass in chemical reactions
  • Explore the differences between closed and open systems in thermodynamics
  • Study stoichiometry in detail to understand mass relationships in reactions
  • Examine real-world applications of conservation laws in chemical engineering
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Students of chemistry, educators explaining fundamental concepts, and professionals in fields such as chemical engineering and environmental science will benefit from this discussion.

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The law of conservation of Matter [HELP]!

What does conservation mean inthe context of matter. Explain please~!
 
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Look at the law of conservation of energy. You can't create or destroy energy, only transform it.

This means that the total energy of a system before something happens is the same as the total energy after.

There's a similar idea with respect to matter. Basically the law states that the mass of a closed system will stay constant regardless of what is happening in that system. The significance of the closed system means that nothing can enter or leave. Everything is contained.

So say you have the following reaction taking place inside a closed flask:

C2H5OH + 3O2-> 3H2O + 2CO2

It's a simple combustion reaction where ethanol is burned. If you put that flask on a mass balance and let the reaction happen, the mass would not change at all. Whatever mass of oxygen and ethanol you had (assuming it was all used) is equal to the mass of the water and carbon dioxide.

If the system is open however, then this law does not apply because matter can come and go as it pleases.

Does that help?
 

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