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ΔH = ΔU + PΔV... (Definition of Enthalpy change)
At constant pressure (for isobaric process)
ΔH = q….
Hence, ΔU = q - PΔV (1st law of thermodynamics)
ΔU = 800 - 0.5*101325 *(0.006–0.002)
ΔU = -602.65 J
All the sign conventions were considered and pressure and volume were converted to their respective SI units.
1 atm pressure = 101325 Pa
1 liter volume = 0.001 cubic m.
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