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3 years ago

When 0.50 liter of a 12m solution is diluted to 1.0 liters, the molarity of the new solution is ____

Chemistry

1 answer:

Akimi4 [234]3 years ago

6 0

Answer:

Final molarity = 6 M

Explanation:

Given data:

Initial volume = 0.50 L

Initial molarity = 12 M

Final volume = 1 L

Final molarity = ?

Solution:

Formula:

M₁V₁ = M₂V₂

M₁ = Initial molarity

V₁ = Initial volume

M₂ = Final molarity

V₂ = Final volume

Now we will put the values.

12 M × 0.50 L = M₂ × 1 L

6 M.L = M₂ × 1 L

M₂ = 6 M.L / 1L

M₂ = 6 M

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Answer:

$CaN_{2} O_{6}$

Explanation:

When calculating an empirical formula from percentages, assume you have a 100g sample. This allows you to convert the percentages directly to grams, because X % of 100g is X grams.

So:

24.42 % = 24.42 g Ca, 17.07% = 17.07g N, 58.5% = 58.5g O

The next step is to divide each mass by their molar mass to convert your grams to moles.

24.42/40.08 = 0.6092 mol

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Then you will divide all of your mol values by the SMALLEST number of moles. This gives you whole numbers that are the mole ratio (subcripts) of the empircal formula.

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In this case, given the masses of copper, zinc and lead, it is possible to compute the moles via their atomic masses first:

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Now, we compute the atomic percentages as shown below:

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