Moles are the base unit of a substance, which is equal to the 6.022×10²³ molecular entities. The 1 mole of a substance is equivalent to the molecular weight of the substance.
The mass of magnesium sulphate is 54.2 grams.
The moles and molar mass exhibit a relationship, such that the number of moles in a substance is equivalent to the ratio of mass and molecular mass.
The molar mass of magneisum sulphate is:
Magnesium = 24
Oxygen = 16 x 4 = 64
Sulphate = 32
Thus, the mass of magnesium sulphate is = 24 + 64 + 32 = 120 grams.
Now, moles is equal to:
[tex]\text {moles} &= \dfrac{\text{given mass}} {\text{molecular mass}}[/tex]
Putting the values:
[tex]\text {moles} &= \dfrac{\text{given mass}} {120}\\\\ 0.450 \times 120 &= {\text{given mass}[/tex]
Thus, the given mass of the magnesium sulphate is 54 g.
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