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4 years ago

What is the molar mass of Al2(SO4)3?150.03 g/mol 278.03 g/mol 342.17 g/mol 450.09 g/mol

2 answers:

6 0

1) we find out the atomic mass of these elements (Al, S, O)

Atomic mass (Al)=27 amu
Atomic mass (S)=32 amu
Atomic mass (O)=16 amu

2)Now, we calculate the molar mass of Al₂(SO₄)₃
molar mass=2(27)+3[32+4(16)]=54+3(32+64)=54+3(96)=54+288=342 g/mol.

answer: 342.17 g/mol.

Triss [41]4 years ago

4 0

Answer:

342.17 g/mol

Explanation:

Molecular formulas is the actual number of atoms of each element in the compound. Molecular mass is the sum of the mass of each element which is present in the molecular formula is multiplied by their subscript which appear in the molecular formula.

Given,

The formula is = $Al_2(SO_4)_3$

Mass from the formula = 2×Molar mass of Aluminium + 3×Molar mass of sulfur + 12×Molar mass of Oxygen

Molar mass of Aluminium = 27.00 g/mol

Molar mass of sulfur = 32.06 g/mol

Molar mass of Oxygen = 15.99 g/mol

So,

Mass from the formula = 2×27.00 + 3×32.06 + 12×15.99 g/mol ≅ 342.17 g/mol

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