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Naily [24]
3 years ago
13

When you walk up to any substance, you can categorize the substance as a solid, liquid, or gas. You could further categorize the

substance as being a pure substance or a mixture, which you wouldn't know without more information. Assuming the substance is pure, what are 3 ways you could report the "amount" of substance in front of you
Chemistry
1 answer:
natima [27]3 years ago
8 0

Answer and Explanation:

In Chemistry, the quantity or amount of a pure substance is given by:

  1. <em>mass</em><em> (in grams)</em>
  2. <em>Volume </em><em>(in millilitres or litres)</em>
  3. <em>Moles </em><em>(mol) </em>

Inter-conversion of units is allowed based on defined units and constituent of the substance.

I believe this explanation would be helpful and easy to follow.

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A 3.96x10^-24 M solution of compound A exhibited an absorbance of 0.624 at 238 nm in a 1.000-cm cuvet; a blank solution containi
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Actual question from source:-

A 3.96x10-4 M solution of compound A exhibited an absorbance of 0.624 at 238 nm in a 1.000 cm cuvette.  A blank had an absorbance of 0.029.  The absorbance of an unknown solution of compound A was 0.375.  Find the concentration of A in the unknown.

Answer:

Molar absorptivity of compound A = 1502.53\ {Ms}^{-1}

Explanation:

According to the Lambert's Beer law:-

A=\epsilon l c

Where, A is the absorbance

 l is the path length  

\epsilon is the molar absorptivity

c is the concentration.  

Given that:-

c = 3.96\times 10^{-4}\ M

Path length = 1.000 cm

Absorbance observed = 0.624

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A = 0.624 - 0.029 = 0.595

So, applying the values in the Lambert Beer's law as shown below:-

0.595=\epsilon\times 1.000\ cm\times 3.96\times 10^{-4}\ M

\epsilon=\frac{0.595}{3.96\times 10^{-4}}\ {Ms}^{-1}=1502.53\ {Ms}^{-1}

<u>Molar absorptivity of compound A = 1502.53\ {Ms}^{-1}</u>

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Which of the following statements is true?
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