What External Pressure Is This Gas Expanding Against?

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The discussion revolves around calculating the external pressure against which nitrogen gas is expanding in a piston setup. Key data includes the mass of nitrogen, initial volume, heat added, temperature change, and volume change. The total energy change (ΔE) during the expansion process is provided, along with the specific heat of nitrogen. Participants are seeking guidance on the necessary equations and steps to determine the external pressure and the energy consumed by the two processes involved. The conversation emphasizes the need for clarity in thermodynamic calculations related to gas expansion.
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Can someone help me with this problem? Even if you could just tell me the steps I'd need to take.. or even just an equation. Something please?

A piston filled with 21.9 of N2 g (MW = 28.02 g/mol) has an initial volume of 7.27 L. 849.5 J of heat were added to the piston, which increased the temperature of the gas by 37.3 °C, leading to a volume change of 0.839 L. The value of ΔE for this expansion process was 607.2 J. What external pressure is this gas expanding against? (The specific heat of N2 g is 1.04 J/g °C)
 
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Added heat was consumed by two processes. Can you name them? Calculate how much energy each of the processes used?
 
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