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Ratling [72]
3 years ago
15

How many moles of Oxygen atoms are in a sample of 3.98 x 10^23 atoms?

Chemistry
2 answers:
Tatiana [17]3 years ago
8 0
1mol\ \ \ \ \rightarrow \ \ \ 6,02*10^{23}\\
x \ \ \ \ \ \ \ \ \ \rightarrow \ \ \ 3,98*10^{23}\\\\
x=\frac{3,98*10^{23}*1mol}{6,02*10^{23}}\approx0,66mol
san4es73 [151]3 years ago
7 0

Explanation:

As per the mole concept, there are 6.022 \times 10^{23} atoms present in 1 mole of a substance.

Mathematically,    1 mole = 6.022 \times 10^{23} atoms or molecules

Therefore, number of moles of oxygen atoms present in 3.98 \times 10^{23} atoms are calculated as follows.

                 \frac{3.98 \times 10^{23} atoms}{6.022 \times 10^{23}atoms/mol}

                  = 0.66 mol

Thus, we can conclude that there are 0.66 moles of oxygen atoms are in a sample of 3.98 \times 10^{23} atoms.

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What does the author predict about the future of the Earth's mantle? Do you support his educated guess? Use complete sentences t
Masja [62]

The earth's mantle will not change in the future because this region is safe from the intervention of human beings.

<h3>What happens in the Earth's mantle?</h3>

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So we can conclude that the earth's mantle will not change in the future because this region is safe from the intervention of human beings.

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7 0
1 year ago
How many molecules are there in 42 grams of AIF3
Sever21 [200]

Answer:

The correct answer is - 3.012×10^23  molecules

Explanation:

The number of molecules is present in any mole of an element or compound are the same. To find the molecules you need to multiply the number of the moles of the compound by Avogadro's number:

Moles are calculated from the molecular weight, for AlF3

= 26.98 + 3×19

= 26.98 + 57

= 83.98

Then moles in 42 grams:

= 42/83.98

= 0.5001190 moles

Now the number of molecules = moles*Avogadro's number

= 0.500110×6.022×10^23

= 3.011×10^23  molecules

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3 years ago
Consider this reaction: Upper K Upper O Upper H + Upper H Upper B 4 right arrow Upper K Upper B r + Upper H Subscript 2 Baseline
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Hbr is the answer when I work it out that’s what I got.
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The moving of molecules from areas of high concentration to that of low concentration to gain energy is best described as passive transport

<h3>What is passive transport?</h3>

Passive transport is a type of membrane transport in which chemicals are moved across cell membranes without using energy. Unlike active transport, which uses cellular energy, passive transport uses the second law of thermodynamics to cause the movement of substances across cell membranes.

<h3>Why is passive transport important?</h3>

Passive transport processes are critical to homeostasis. They maintain proper conditions inside the cell and the organism as a whole by letting chemicals to pass into and out of the cell.

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1 year ago
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