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solong [7]
3 years ago
5

A chemist prepares a solution of iron(III) bromide (FeBr3) by measuring out 41.1 mg of FeBr3 into a 50. mL volumetric flask and

filling to the mark with
distilled water.

Calculate the molarity of Br- anions in the chemist's solution

Be sure your answer is rounded to 2 significant digits.
Chemistry
1 answer:
allsm [11]3 years ago
5 0

Answer: The molarity of Br^- anions in the chemist's solution is 0.0084 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

Molarity=\frac{n\times 1000}{V_s}

where,

n = moles of solute

V_s = volume of solution in ml

moles of FeBr_3 = \frac{\text {given mass}}{\text {Molar mass}}=\frac{0.0411g}{295.6g/mol}=0.00014mol

Now put all the given values in the formula of molality, we get

Molarity=\frac{0.00014\times 1000}{50}=0.0028

As 1 mole of FeBr_3 gives = 3 moles of Br^-

0.0028 moles of FeBr_3 gives = \frac{3}{1}\times 0.0028=0.0084 moles of Br^-

Thus the molarity of Br^- anions in the chemist's solution is 0.0084 M

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Y = 57.15 − 0.5 X If Y equals 5 , what is X ?<br><br> Then is Y=3, what is X?
Fiesta28 [93]

When y equals 5, x is 104.3

When y equals 3 then x is 108.3

<em><u>Solution:</u></em>

<em><u>Given expression is:</u></em>

y = 57.15 - 0.5x

<h3><u>If y equals 5 what is x ?</u></h3>

Substitute y = 5 in given expression

5 = 57.15 - 0.5(x)

5 = 57.15 - 0.5x

0.5x = 57.15 - 5

0.5x = 52.15

Divide both sides by 0.5

x = 104.3

Thus when y equals 5, x is 104.3

<h3><u>If y = 3 what is x ?</u></h3>

Substitute y = 3 in given expression

3 = 57.15 - 0.5(x)

3 = 57.15 - 0.5x

0.5x = 57.15 - 3

0.5x = 54.15

Divide both sides by 0.5

x = 108.3

Thus when y equals 3 then x is 108.3

7 0
4 years ago
Calculate the mass of water if the densityis 1.02 g/mL and the volume is 62 ml. M = (D(V)
schepotkina [342]

Answer:

<h2>The answer is 63.24 g</h2>

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

<h3>mass = Density × volume</h3>

From the question

volume = 62 mL

density = 1.02 g/mL

The mass of the water is

mass = 1.02 × 62

We have the final answer as

<h3>63.24 g</h3>

Hope this helps you

7 0
3 years ago
1
WINSTONCH [101]

Answer:

The new substance will need more energy to form its chemical bonds than the old substance will release. ... More energy will be released from the old substance than the new substance will need to form its chemical bonds.

Explanation:

This is the answer I got. Hope it's really helpful

5 0
3 years ago
Explain how you would calculate the density of a substance. Include a solution map in your explanation.
horrorfan [7]
Density = mass/volume again, density is the ratio of mass to volume.
8 0
2 years ago
Consider the following reaction taking place in a voltaic cell:
klasskru [66]

Answer:

Option C. Cu is oxidized at the anode and Ag+ is reduced at the cathode.

Explanation:

The reaction that is taking place in the voltaic cell is:

Cu(s) + 2Ag⁺(aq)  →  Cu²⁺(aq) + 2Ag(s)

A voltaic cell is an electrochemical cell that uses spontaneous redox reactions, like the above, to generate electricity.

In the rection above, the electrode of the anode is Cu, and the electrode of the cathode is Ag. In the cell, the solution of Ag⁺ produces the oxidation of the Cu(s) which results in Cu²⁺ and Ag(s) (since the Ag⁺ is being reduced). In a voltaic cell, the anode is the electrode at which the oxidation reaction occurs and the cathode is the electrode at which the reduction reaction takes place.   

The redox reactions in this system release energy, so a wire connects the two reactions and allows electrons to flow from one side to the other, forming the Voltaic (or Galvanic) Cell.

From all of the above, the correct option is c: Cu is oxidized at the anode, and Ag+ is reduced at the cathode.

I hope it helps you!

4 0
3 years ago
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