3. Nitrogen in an amount of 10 m3 (reduced to normal conditions) was placed in a hermetically sealed vessel and heated to a temperature t1 = 1450 C. The pressure p1 became equal to 3.8 MPa. Then the gas was cooled to a temperature t2=47 C. What was the pressure after cooling and how much heat was removed? Solve the problem, considering the heat capacity independent of temperature.

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