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Digiron [165]
3 years ago
9

Question 4 A mixture of xenon and oxygen gas is compressed from a volume of to a volume of , while the pressure is held constant

at . Calculate the work done on the gas mixture. Round your answer to significant digits, and be sure it has the correct sign (positive or negative).
Chemistry
1 answer:
Misha Larkins [42]3 years ago
8 0

Answer:

W = - 1218 atm L

Explanation:

Complete question

A mixture of krypton and oxygen gas is expanded from a volume of 23.0L to a volume of 81.0L, while the pressure is held constant at 21.0atm. Calculate the work done on the gas mixture. Be sure your answer has the correct sign (positive or negative) and the correct number of significant digits.

Solution

As we know that -

Work done is equal to the product of pressure applied and change in the difference of volume of two liquids.

This can be represented mathematically as follows -

W = -P*(V_2-V_1)\\

Where W represents the work done

P represents the change in pressure

V_2 is the final volume  and

V_1 is the initial volume

Substituting the given values in above equation, we get -

W = - 21 * (81 -23)\\

W = - 1218 atm L

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Answer : The acid dissociation constant Ka of the acid is, 8.7\times 10^{-5}

Explanation :

First we have to calculate the concentration of hydrogen ion.

pH=-\log [H^+]

Given: pH = 4.06

4.06=-\log [H^+]

[H^+]=8.71\times 10^{-5}M

The dissociation of acid reaction is:

                         HA\rightarrow H^++A^-

Initial conc.      c        0         0

At eqm.           c-cα    cα       cα

Given:

Degree of dissociation = α = 0.10 % = 0.001

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8.71\times 10^{-5}=c\times 0.001

c=0.0871M

The expression of dissociation constant of acid is:

K_a=\frac{[H^+][A^-]}{[HA]}

K_a=\frac{(c\times \alpha)\times (c\times \alpha)}{(c-c\alpha)}

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

K_a=\frac{(0.0871\times 0.001)\times (0.0871\times 0.001)}{(0.0871-0.0871\times 0.001)}

K_a=8.7\times 10^{-5}

Thus, the acid dissociation constant Ka of the acid is, 8.7\times 10^{-5}

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Explanation:

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