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: The concentartion of solution will be 0.224 M
Explanation:
Molarity : It is defined as the number of moles of solute present per liter of the solution.
Formula used :
where,
n= moles of solute =
= volume of solution in ml = 275 ml
Now put all the given values in the formula of molarity, we get
Therefore, the concentration of solution will be 0.224 M