Answer:
An emerald can be described as a pure substance because it is a compound. it's a pure substance because it is an element. It's an impure substance because it is chemically combined, an impure substance because it is a mixture.
Explanation:
The balanced equation of the reaction shows that the mole of atoms on both sides of the reaction are equal.
<h3>What are balanced chemical equations?</h3>
Balanced chemical equations are equations in wgich the moles of each species on both sides of the reaction are equal.
To balance chemical equations, numerical coefficients are placed in front of the species in the reaction.
The balanced equations of the reaction are as follows:



Therefore, the balanced equation of the reaction shows that the mole of atoms on both sides of the reaction are equal.
Learn more about balancing equations at: brainly.com/question/11904811
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Answer: There are 0.0637 moles present in 85.0 mL of 0.750 M KOH.
Explanation:
Given: Volume = 85.0 mL (1 mL = 0.001 L) = 0.085 L
Molarity = 0.750 M
It is known that molarity is the number of moles of solute present in liter of a solution.
Therefore, moles present in given solution are calculated as follows.

Thus, we can conclude that there are 0.0637 moles present in 85.0 mL of 0.750 M KOH.
The surface area is a big help