A 4.00L flask containing Ne at 25 C and 6.00 atm is joined by a valve to an 8.00 L flask Ar at 25 C and 2.00 atm.
The valve is opened and the gases mix. If the temperature is constant, what is the (total) pressure in the connected flasks after mixing?
answer: ? atm

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Irenecarolhernandez2idn Irenecarolhernandez2idn

06-03-2021
Chemistry

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A 4.00L flask containing Ne at 25 C and 6.00 atm is joined by a valve to an 8.00 L flask Ar at 25 C and 2.00 atm.
The valve is opened and the gases mix. If the temperature is constant, what is the (total) pressure in the connected flasks after mixing?
answer: ? atm

Sagot :

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Sebassandinidn Sebassandinidn · Answer 1 · 2021-03-10T19:42:09-05:00

Answer:

[tex]P=3.33atm[/tex]

Explanation:

Hello!

In this case, since know the volume, temperature and pressure of the initial containers, we can compute the moles of each gas prior to the opening of the valve as shown below:

[tex]n_{Ne}=\frac{6atm*4L}{0.08206\frac{atm*L}{mol*K}*298.15K} =0.981molNe\\\\n_{Ar}=\frac{2atm*8L}{0.08206\frac{atm*L}{mol*K}*298.15K} =0.654molAr[/tex]

Next, we add them up to obtain the total moles:

[tex]n_T=0.981mol+0.654mol=1.635mol[/tex]

Now, the total volume:

[tex]V_T=4.00L+8.00L=12.00L[/tex]

Finally, the total pressure is computed by using the ideal gas equation:

[tex]P=\frac{1.635mol*0.08206\frac{atm*L}{mol*K}*298.15K}{12.00L}\\\\P=3.33atm[/tex]

Best regards!

Sagot :

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