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3 years ago

Pllllllllzzzz help I really need it

Chemistry

1 answer:

Oksana_A [137]3 years ago

5 0

Solid to gas sublimation
Gas to solid deposition
Liquid to gas Evaporation
Gas to liquid Condensation
Liquid to Solid Freezing
Solid to liquid Melting

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Express the concentration of a 0.0320 M aqueous solution of fluoride, F−, in mass percentage and in parts per million (ppm). Ass

denis23 [38]

Answer:

607 ppm

Explanation:

In this case we can start with the ppm formula:

$ppm=\frac{mg~of~solute}{Litters~of~solution}$

If we have a solution of 0.0320 M, we can say that in 1 L we have 0.032 mol of $F^-$ , because the molarity formula is:

$M=\frac{mol}{L}$

In other words:

$0.0320~M=\frac{mol}{1~L}$

$mol=0.032~M*1~L=0.032~mol$

$1~L~of~Solution=0.0320~mol~of~solute$

If we use the atomic mass of $F$ (19 g/mol) we can convert from mol to g:

$0.0320~mol~F^-\frac{19~g~F^-}{1~mol~F^-}~=~0.607~g$

Now we can convert from g to mg (1 g= 1000 mg), so:

$0.607~g\frac{1000~mg}{1~g}=607~mg$

Finally we can divide by 1 L to find the ppm:

$ppm=\frac{607~mg}{1~L}=~607~ppm$

We will have a concentration of 607 ppm.

I hope it helps!

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3 years ago

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djyliett [7]

Did you mean why? not where?

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Jlenok [28]

Answer: 90.3

Explanation:

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2 years ago

In large generators in power plants, ___________ rotate inside a coil of wire to produce an electric current

lapo4ka [179]

<h3>Answer;</h3>

Magnets

In large generators in power plants, magnets rotate inside a coil of wire to produce an electric current.

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