Which of the following are considered pure substances?
2 answers:
Answer: Option (A) is the correct answer.
Explanation:
A pure substance is defined a substance that contains atoms of same element and it has constant composition throughout the sample.
For example, sulfur, , nitrogen etc are all pure substances.
Whereas a compound is a substance that contains two or more substances which are combined together in a fixed composition.
For example, NaCl is a compound.
When components of solute are uniformly distributed in a solvent then the solution is known as homogeneous solution.
When components of solute are non-uniformly distributed in a solvent then the solution is known as heterogeneous solution.
Thus, we can conclude that elements are considered pure substances.
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Answer:
1: At temperatures below 542.55 K
2: At temperatures above 660 K
Explanation:
Hello there!
In this case, according to the thermodynamic definition of the Gibbs free energy, it is possible to write the following expression:
Whereas ΔG=0 for the spontaneous transition. In such a way, we proceed as follows:
1:
It means that at temperatures lower than 542.55 K the reaction will be spontaneous.
2:
It means that at temperatures higher than 660 K the reaction will be spontaneous.
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