Answer:
The dot between KAl(SO4)2 and 12 H2O in the formula indicates that twelve moles of water are associated with every mole of KAl(SO4)2. Therefore, the mass of the twelve water molecules, called the waters of hydration, must be included in the molecular weight of the compound.
Explanation:
The mass of the twelve water molecules are included in the molecular weight of the compound ,therefore the given statement is true.
Molecular weight is the sum of all atoms in a molecule. Molecular weight is represented in the atomic mass unit . It tells us the number of grams of a substance is present in one mole of that compound.
Molecular weight is based on the molecular formula of a compound.
According to the question, the dot between K Al(SO4)2 and 12 H2O in the formula indicates that twelve moles of water are associated with every mole of K Al(SO4)2.
And because of this the mass of the twelve water molecules, called the waters of hydration, must be included in the molecular weight of the compound.
The twelve hydrated water molecules of alum are included in the molecular weight, hence the given statement is true.
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