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ValentinkaMS [17]
3 years ago
7

Which of the following statements about moles is correct?

Chemistry
2 answers:
Usimov [2.4K]3 years ago
8 0

Answer: A mole of Cu atoms has the same number of atoms as a mole of He atoms.

Explanation:

In one mole of atoms there are 6.02\times 10^{23} numbers of atoms. Given by Amedeo Avogadro. Also know as Avogadro number. It remain constant for every 1 mole of substance.

N_A=6.02\times 10^{23} atoms

1 mole=6.02\times 10^{23} \text{atoms or molecule or ions or particles}

The correct statement is"A mole of Cu atoms has the same number of atoms as a mole of He atoms."


jasenka [17]3 years ago
5 0
The answer is A. A mole of Cu has the same number of atoms as a mole of He atoms
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Answer:

Cu~+~PtCl_2->Pt~+~CuCl_2

Explanation:

In this case, we can start with the <u>formula of Platinum (II) Chloride</u>. The cation is the atom at the left of the name (in this case Pt^+^2) and the anion is the atom at the right of the name (in this case Cl^-). With this in mind, the <u>formula would be</u> PtCl_2.

Now, if we used <u>metallic copper</u> we have to put in the reaction only the <u>copper atom symbol</u> Cu. So, we have as reagents:

Cu~+~PtCl_2->

The question now is: <u>What would be the products?</u> To answer this, we have to remember <u>"single displacement reactions"</u>. With a general reaction:

A~+~BC->AB~+~C

With this in mind, the reaction would be:

Cu~+~PtCl_2->Pt~+~CuCl_2

I hope it helps!

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