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Ksivusya [100]
3 years ago
7

A copper wire is made of copper (Cu) atoms. Which of the following best describes the copper atoms?

Chemistry
2 answers:
Maslowich3 years ago
4 0

Answer: They are all basically the same, but the number of neutrons could vary.

Explanation: The atoms of an element are basically alike. However, atoms of the same element can have different numbers of neutrons and electrons. The number of protons is always the same for atoms of the same element.

Evgesh-ka [11]3 years ago
3 0

Answer: Option (A) is the correct answer.

Explanation:

An element is defined as a substance that contains atoms of same type.

As copper wire is a substance that is made up of only atoms of copper. And, all these atoms of copper will be the same. Hence, it is an element.

This means that all the atoms of copper will have same number of protons, neutrons and electrons.

Thus, we can conclude that the statement they are all exactly the same best describes the copper atoms.

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0.26g of NaCl is the maximum mass that could be produced

Explanation:

Based on the reaction:

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<em>Where 1 mol of HCl reacts per mol of NaOH to produce 1 mol of NaCl</em>

<em />

To solve this question we need to find <em>limiting reactant. </em>The moles of limiting reactant = Moles of NaCl produced:

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0.365g HCl * (1mol / 36.46g) = 0.010 moles HCl

<em>Moles NaOH -Molar mass: 40g/mol-:</em>

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As the reaction is 1:1 and moles NaOH < moles HCl, limiting reactant is NaOH and maximum moles produced of NaCl are 0.0045 moles.

The mass of NaCl is:

<em>Mass NaCl -Molar mass: 58.44g/mol-:</em>

0.0045 moles * (58.44g/mol) =

<h3>0.26g of NaCl is the maximum mass that could be produced</h3>
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