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Citrus2011 [14]
3 years ago
10

5. If you evaluated 5 solvents as possible recystallization solvents do you think it is generally true that the solvent which ap

pears to dissolve the solute is always the best choice? What about a solvent that does not appear to dissolve the solute at all, should if automatically be eliminated as a potential recrystallization solvent? Give a brief explanation for your reasoning for both the most and least soluble solvent-solute combination of the five solvents.
Chemistry
1 answer:
vesna_86 [32]3 years ago
4 0

Answer:

impurities

Explanation:

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What is the mass of one mole of carbon-12?
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Hello

12 grams

The mass of one mole of carbon-12 atoms is 12 grams.

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Need help ASAP!<br><br> How many moles of sodium nitrate are in 0.25 L of 1.2 M NaNO3 solution?
Setler79 [48]

Answer:

\boxed {\boxed {\sf 0.3 \ mol \ NaNO_3}}

Explanation:

Molarity is a measure of concentration in moles per liter.

molarity= \frac{moles \ of \ solute}{liters \ of \ solution}

The molarity of the solution is 1.2 M NaNO₃ or 1.2 moles NaNO₃ per liter. There are 0.25 liters of the solution. The moles of solute are unknown, so we can use x.

  • molarity= 1.2 mol NaNO₃/L
  • liters of solution=0.25 L
  • moles of solute =x

1.2 \ mol \ NaNO_3/L= \frac{x}{0.25 \ L}

We are solving for x, so we must isolate the variable, x. It is being divided by 0.25 liters. The inverse of division is multiplication, so we multiply both sides by 0.25 L.

0.25 \ L *1.2 \ mol \ NaNO_3/L=\frac{x}{0.25 \ L} *0.25 \ L

0.25 \ L *1.2 \ mol \ NaNO_3/L=x

The units of liters cancel, so we are left with the units moles of sodium nitrate.

0.25  *1.2 \ mol \ NaNO_3=x

0.3 \ mol \ NaNO_3=x

There are 0.3 moles of sodium nitrate.

3 0
2 years ago
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