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The internal energy change in the conver...

The internal energy change in the conversion of `1.0` mole of the calcite form of `CaCO_3` to the aragonite form is `+0.21 KJ`. Calculate the enthalpy change when the pressure is `1.0 `bar, given the densities of the solids are `2.71 gcm^(-3)` and `2.93 gcm^(-3)` respectively.

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