Question

Calculate the formula unit mass of Al2(So4)3.

Answer 1

Given,

The compound Al2(So4)3 is given.

To find,

The formula unit mass of the given compound.

Solution,

The formula unit mass of Al2(So4)3 is 342 gm.

We can simply find the formula unit mass by splitting the elements of the compound. The atomic mass of Al, S, and O is 27,32, and 16 respectively.

2Al +3S +12O

2(27) + 3(32) + 12(16)

342 gm

Hence, the formula unit mass of Al2(So4)3 is 342 gm.

Answer 2

Given :

Al₂(SO₄)₃

To Find :

Formula unit mass of Al₂(SO₄)₃

Solution :

Atomic mass of Aluminum (Al) = 27 u

Atomic mass of Sulphur (S) = 32 u

Atomic mass of Oxygen (O) = 16 u

∴ The formula unit mass of Al₂(SO₄)₃ = 2×27 + 3(32 + 4×16)

                                                             =  54 + 3×96

                                                             =  342 u

Hence, the formula unit mass of Al₂(SO₄)₃ is found to be 342 u