ababaseball3793 ababaseball3793 19-03-2024 Chemistry contestada A gas expands isothermally against a constant external pressure of 1 atm from a volume of 10 dm³ to a volume of 20 dm³. It absorbs 300 J of thermal energy from its surrounding. The △U is:A. −312 JB. +123 JC. −213 JD. +231 J