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Katarina [22]
3 years ago
5

Help and explain step by step if you can!

Chemistry
1 answer:
Leona [35]3 years ago
4 0

Answer:

the third one

Explanation:

if you look at it mathematically its the one that makes the most sense

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Justify air is a mixture not a compound
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A compound has to be chemically bonded, however, air is not chemically bonded.
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Hope this helps :)
4 0
3 years ago
Read 2 more answers
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natulia [17]

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3 years ago
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A hypothetical element consists of two isotopes of masses 86.95amu and 88.95amu with abundances of 35.5% and 64.5% respectively.
Art [367]

Answer: The average atomic mass of the element = 88.242amu

Explanation:

The abundance of the first isotope is =35.5%

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The abundance of the second isotope =64.5%

Atomic mass of the second isotope =88.95amu

The average atomic mass of second isotope =88.95amu x 64.5% = 88.95amu x 0.645= 57.37275 amu

Now the average atomic mass =30.8725 +57.37275 = 88.242amu

OR using the formulae

Average atomic mass = [mass of isotope× its abundance] + [mass of isotope× its abundance] +...[ ] / 100

{(86.95amu X 35.5 )+(88.95amu x 64.5)}/100

8,824/100

=88.24amu

5 0
3 years ago
What is the effect of an insoluble impurity, such as sand, on the observed melting point of a compound?]?
Taya2010 [7]
The effect of an insoluble impurity, such as sand, on the observed melting point of a compound would be none. It will not depress or elevate the melting point of the compound. Instead, it would affect the reading if you are trying to determine the melting point of the compound. This is because you might be missing  the actual melting point of the compound since you will be waiting for the whole sample to liquify. You would not be able to determine exactly that temperature because of the insoluble impurity would have a different melting point than that of the compound.
7 0
3 years ago
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