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lapo4ka [179]
3 years ago
7

When 100. mL of 6.00 M HCl is diluted to 300. mL, the final concentration is ________.

Chemistry
2 answers:
Nezavi [6.7K]3 years ago
7 0

Answer:

The final concentration is 2 M

Explanation:

Dilution is the procedure to prepare a less concentrated solution from a more concentrated one. It consists of adding more solvent.

The amount of solute (the solute is the solid, liquid or gaseous substance that dissolves in the solvent to produce a homogeneous mixture known as a solution and is generally found in a smaller proportion) does not vary. The volume of the solvent varies, so that the concentration of the solute decreases, as the volume of the solution increases.

In summary, dilution is a procedure by which the concentration of a solution is decreased, generally with the addition of a diluent.

One way to calculate concentrations or volumes in dilutions is through the expression:

Ci * Vi = Cf * Vf

where

  • Ci = initial concentration
  • Vi = Initial volume
  • Cf = Final concentration
  • Vf = Final volume

In this case:

  • Ci= 6 M
  • Vi= 100 mL= 0.1 L (1 L=1000 mL)
  • Cf= ?
  • Vf= 300 mL= 0.3 L

Replacing:

6 M* 0.1 L= Cf*0.3 L

Solving:

Cf=\frac{6 M* 0.1 L}{0.3 L}

Cf=2 M

<u><em>The final concentration is 2 M</em></u>

Marat540 [252]3 years ago
3 0

Answer:

2.00 M

Explanation:

The concentration of a solution is given by

M=\frac{m}{V}

where

m is the mass of solute

V is the volume of the solution

At the beginning, the solution has:

M = 6.00 M is the concentration

V = 100 mL = 0.1 L is the volume

So the mass of solute (HCl) is

m=MV=(6.00)(0.1)=0.6g

Then, the HCL is diluted into a solution with volume of

V = 300 mL = 0.3 L

Therefore, the final concentration is:

M=\frac{m}{V}=\frac{0.6}{0.3}=2.00 M

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(1 pt) You have 250.0 mL of 0.136 M HCl. Using a volumetric pipet, you take 25.00 mL of that solution, place it in a 100.00 ml v
alexdok [17]

Answer:

0.034M HCl is the concentration of the diluted solution

Explanation:

You take, initially, 25.00mL of the 0.136M HCl. Then, you dilute the solution to 100.00mL. The solution is diluted:

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That means the concentration of the diluted solution is:

0.136M / 4 =

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Answer : The entropy change for the surroundings of the reaction is, -198.3 J/K

Explanation :

We have to calculate the entropy change of reaction (\Delta S^o).

\Delta S^o=S_{product}-S_{reactant}

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where,

\Delta S^o = entropy of reaction = ?

n = number of moles

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\Delta S^0{(H_2)} = standard entropy of H_2

\Delta S^0{(N_2)} = standard entropy of N_2

Now put all the given values in this expression, we get:

\Delta S^o=[2mole\times (192.5J/K.mole)]-[1mole\times (191.5J/K.mole)+3mole\times (130.6J/K.mole)]

\Delta S^o=-198.3J/K

Therefore, the entropy change for the surroundings of the reaction is, -198.3 J/K

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