Answer:

Explanation:
Consider that, as the system is adiabatic,
where U1 and U2 are the internal energies before the process and after that respectively.
Consider that:
, and that the internal energy of the first state is the sum of the internal energy of each tank.
So, 
Where A y B are the tanks. The enthalpy for an ideal gas is only function of the temperature, as the internal energy is too; so it is possible to assume: 
So, 
Isolating
,


So,

Answer:
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In a double-replacement reaction, the _____.?
There are many more interesting things to ask about double replacement reactions than are contained in the list given here. But the only correct choice is:
C.reactants are two ionic compounds
Salt hydrates are an important class of PCMs. An inorganic salt hydrate (hydrated salt or hydrate) is an ionic compound in which the ions attract a number of water molecules, which are then trapped inside the crystal lattice. A hydrated salt has the generic formula MxNy. nH2O.