Hello there!
Here is the solution regarding your question.
Given,
Vi = 1.2 litres
T = 37°C [ and that is equal to 310 K ].
Pi = 10 dyne / cm²
Vf = 3 x Vi
The process mentioned in the question is Isothermal. So,
PV = constant
PiVi= PfVf
Pf = PiVi / Vf
Pf = 10 x 1.2 / 1.2 x 3
Pf = 0.33 x 10 dyne / cm²
Hence, the final pressure is 0.33 x 10 dyne / cm².
I hope you got your answer.
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