Answered

When water evaporates at constant pressure, the sign of the change in enthalpy

Ais negative.
Bis positive.
Cdepends on the temperature.
Ddepends on the volume of the container.
Edoes not exist; that is, the enthalpy change is zero.

Verified Answer :

Bis positive
H20 (l)--> H20 (g)
when that happens, the heat is absorbed into the liquid to change the state of the liquid to gas; therefore, in order to change to a gaseous state, heat must be a reactant. and so enthalpy is increasing

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