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ehidna [41]
3 years ago
8

Iron fluoride (FeF2) dissociates according to the following equation: FeF2(s) ⇌ Fe2+(aq) + 2 F–(aq) A sample of iron fluoride (F

eF2) is dissolved in water, and a saturated solution is obtained. The [Fe2+] is measured to be 2.05 × 10–4 mol/L. What is the concentration of fluoride (F–) ions?
Chemistry
1 answer:
Anastasy [175]3 years ago
6 0

Answer:

4.1 x 10^-4 mol/L

Explanation:

For the equation

FeF2(s)  --> Fe2+(aq) + 2F- (aq)

We have that for every mole of FeF2 we have a mole of Fe2+ and 2 moles of F-

FeF2(s)  --> Fe2+(aq) + 2F- (aq)

   1                  1                 2

If we have 2.05 x 10^-4 moles of Fe2+

FeF2(s)  --> Fe2+(aq) +      2F- (aq)

                2.05 x 10^-4         2 x 2.05 x 10^-4  

2 x 2.05 X 10^-4 = 5.1 x 10^-4 moles

So if in the solution is measured 2.05 x 10^-4 mol/L of [Fe2+] we have 5.1 x 10^-4 mol/L of [F-]

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A sample of helium occupies a volume of 180.0 ml at a pressure of 0.800 atm and a temperature of 29°C. What will be the
Brrunno [24]

Answer:

If the volume of the container is decreased to  90.0 ml and the pressure is increased to 1.60 atm the temperature will be 302 °K

Explanation:

Boyle's law says that "The volume occupied by a given gas mass at constant temperature is inversely proportional to the pressure", which is expressed mathematically as:  

P * V = k

Charles's Law consists of the relationship between the volume and temperature of a certain amount of ideal gas, which is maintained at a constant pressure, by means of a proportionality constant that is applied directly. In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio between volume and temperature will always have the same value:

\frac{V}{T} =k

Finally, Gay Lussac's law establishes that as the temperature increases, the gas molecules move more quickly and therefore the number of collisions against the walls increases, that is, the pressure increases since the container is of fixed walls and its volume can not change. Therefore, the ratio of pressure to temperature always has the same value (it is constant).

\frac{P}{T}=k

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

\frac{P*V}{T}=k

Having a state 1 at the beginning and a state 2 at the end is fulfilled:

\frac{P1*V1}{T1}=\frac{P2*V2}{T2}

In this case, you know:

  • P1= 0.800 atm
  • V1= 180 mL= 0.180 L (being 1 L=1000 mL)
  • T1= 29 °C= 302 °K
  • P2= 1.60 atm
  • V2= 90 mL= 0.09 L
  • T2=?

Replacing:

\frac{0.800 atm*0.180L}{302 K}=\frac{1.60 atm*0.09L}{T2}

Solving:

T2*\frac{0.800 atm*0.180L}{302 K}=1.60 atm*0.09L

T2=\frac{1.60 atm*0.09L}{\frac{0.800 atm*0.180L}{302 K}}

T2= 302 °K

<em><u>If the volume of the container is decreased to  90.0 ml and the pressure is increased to 1.60 atm the temperature will be 302 °K</u></em>

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Calculate the pH of a 3.58x10^-9 M Nitric acid (a strong acid) solution
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Answer:

pH= 8.45

Explanation:

when working with strong accids pH = -log(Concentration)

so -log(3.58e-9) = 8.446

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3 years ago
If an endothermic reaction begins at 26 degrees celsius and decreases by 2 degrees Celsius per minute, how long would it take to
Natalija [7]

Answer:

It would take 13 minutes.

Explanation:

The temperature decreases at a linear rate, meaning that we can describe the process by using the following formula:

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Where T₂ is the final temperature, T₀ is the initial temperature; and t is the elapsed time in minutes.

We input the data given by the problem:

  • 0 °C = 26 °C - 2°C/min * t

And solve for t:

  • t = 13 min
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How can gravity's role in tectonic plate motion be described
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