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Chemistry Level 2

$\large \ce{X + Y + CO_2} {\ce{->}} \ce{Z + MgCl_2} \quad (\text{temperature at 273 K})$

Above shows an "Engel and Precht's process. It is found that $$\ce Z$$ is a double salt. Find the number of water molecules of crystallisation in $$\ce Z$$.

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