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Isobaric means there's no change in pressure. As pressure is constant, use the formula w=-p*deltaV to find the work. Other words include Isochoric, which means there's no change in volume (AKA no work) and isothermic, which means no change in temperature (Delta U = 0).
If there is no change in pressure, as stated as ΔP=0, then there is value for the pressure to be plugged in the equation of w =-PΔV. If the value of pressure or the change in volume are not given, then you can use -Δn*R*T to find work. At a constant pressure,qp equal to ΔH. You can also find q with q=nCpΔT.
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