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Ronch [10]
3 years ago
6

How many moles of KBr are present in 8.96 x 10^21

Chemistry
1 answer:
Gelneren [198K]3 years ago
6 0

Answer:

0.015 moles

Explanation:

  • One mole of a compound contains molecules equivalent to the Avogadro's constant, 6.022 × 10^23.
  • That is, 1 mole of a compound will have 6.022 × 10^23 molecules.

In our case, We are given 8.96 x 10^21 molecules of KBr

We need to find the number of moles in 8.96 x 10^21 molecules

1 mole of KBr = 6.022 × 10^23 molecules.

8.96 x 10^21 molecules = ?

Therefore;

(1 × 8.96 x 10^21 molecules ) ÷ 6.022 × 10^23 molecules.

 = 1.488 × 10^-2 moles

 = 0.01488 moles

= 0.015 moles

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There are several information's already given in the question. Based on the information's provided, the answer can be easily deduced.
V1 = 25 ml
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M2 = 1.0 M
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Then
M1V1 = M2V2
M1 = M2V2/V1
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From the above deduction, it can be easily concluded that the correct option among all the options that are given in the question is the first option or option "A". I hope that this is the answer that has actually come to your help.
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What is the substance called that is being dissolved in a solution?
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Solute - The solute is the substance that is being dissolved by another substance. In the example above, the salt is the solute. Solvent - The solvent is the substance that dissolves the other substance. In the example above, the water is the solvent.

Explanation:

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The 225 g FeCl2 is about 1.8 moles.
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4 \frac{mol}{l}

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From the question, we have been asked to find the molarity of FeCl2 having a volume of 450 mL,

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We know that molarity of any solution should be in mol/L.

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Let's convert 450 mL to Litres which is,

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x moles are contained in 0.450 L

Hence,

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See figure 1

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