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# When an open vessel is heated, which of the following holds true for the ideal gas inside the vessel?

(A) "n" is constant (B) "nT" is constant (C) "PT" is constant (D) None of the above

For an open vessel, the volume is constant for the gas inside.
Also, the pressure is the same (or equal) to the pressure of the surroundings.
So, P & V are constant which imples that nT = constant because PV = nRT.