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Natali [406]
3 years ago
7

425 mL of neon gas at -12°C and 788 mmHg

Chemistry
1 answer:
pashok25 [27]3 years ago
8 0

Answer:

The final temperature is 806.226 degrees celcius.

Explanation:

It is given that initial conditions are as follows,

<em>Initial volume = 425 ml</em>

<em>Initial temperature =- 12 degrees celcius = 261 K</em>

<em>Initial pressure =788 mmHg</em>

The final conditions are as follows,

<em>Final volume = 2.4 liters</em>

<em>Final pressure = 577 mmHg</em>

<em>Final temperature = "T"</em>

<em>Let R be universal gas constant, n be number of moles..</em>

The ideal gas equation, is as follows,

(pressure)(volume) = (number of moles)(R)(temperature)

The number of moles remain constant in the process,

so equating <em>initial number of moles = final number of moles</em> , we get

\frac{(788)(425)(10^{-3}}{261} = \frac{(577)(2.4)}{T}

T = 1079.226 K = 806.226 degrees celcius

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Answer:

The molarity of the solution is 1,03 M.

Explanation:

Molarity is a concentration measure that expresses the moles of solute (in this case HBR) in 1 liter of solution (1000ml). First we calculate the mass of 1 mol of HBr, to calculate the moles that are in 50 g of said compound:

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80,91 g ----1 mol HBr

50,0 g------x= (50,0 g x1 mol HBr)/80,91 g= 0,62 mol HBr

600 ml solution-----0,62 mol HBr

1000ml solution------x= (1000ml solution x 0,62 mol HBr)/600 ml solution

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3 years ago
Question 3) A 1.00 L buffer solution is 0.250 M in HF and 0.250 M in LiF. Calculate the pH of the solution after the addition of
Masja [62]

The pH of the solution after adding 0.150 moles of solid LiF is 3.84

<u>Explanation:</u>

We have the chemical equation,

HF (aq)+NaOH(aq)->NaF(aq)+H2O

To find how many moles have been used in this

c= n/V=> n= c.V

nHF=0.250 M⋅1.5 L=0.375 moles HF

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nF=0.250 M⋅1.5 L=0.375 moles F

nHF=0.375 moles - 0.250 moles=0.125 moles

nF=0.375 moles+0.250 moles=0.625 moles

[HF]=0.125 moles/1.5 L=0.0834 M

[F−]=0.625 moles/1.5 L=0.4167 M

To determine the problem using the Henderson - Hasselbalch equation

pH=pKa+log ([conjugate base/[weak acid])

Find the value of Ka

pKa=−log(Ka)

pH=−log(Ka) +log([F−]/[HF]

pH= -log(3.5 x 10 ^4)+log(0.4167 M/0.0834 M)

pH=-log(3.5 x 10 ^4)+log(4.996)

pH= -4.54+0.698

pH=-(-3.84)

pH=3.84

The pH of the solution after adding 0.150 moles of solid LiF is 3.84

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