How many waters of hydration are present in one molecule of MgSO4 x 7H2O?

In the compound magnesium sulfate heptahydrate, represented as MgSO4 x 7H2O, the notation indicates that each formula unit of magnesium sulfate is associated with seven water molecules. This is a characteristic property of hydrate compounds, where the "x" denotes that the substance forms a crystalline structure incorporating a specific number of water molecules.

In this case, "7H2O" signifies that there are seven waters of hydration for each formula unit of magnesium sulfate (MgSO4). These water molecules are integral to the solid structure of the hydrate, influencing its physical properties, such as color, solubility, and stability under certain conditions. Thus, the answer indicating the presence of seven water molecules in one molecule of MgSO4 is indeed accurate and reflects the chemical composition of the hydrate.