Calculate the % of oxygen in Al2(SO4)3. (Atomic mass: Al-27, O-16, S -32) - Science

Calculate the % of oxygen in Al₂(SO₄)₃. (Atomic mass: Al-27, O-16, S -32)

Sum

Aluminum Sulphate – Al₂(SO₄)₃

Molar mass of Aluminium Sulphate = (27 × 2) + (32 × 3) + (16 × 12) = 54 + 96 + 192 = 342 g

% of Oxygen = `192/342 × 100` = 56.14%.

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Chapter 7: Atoms and Molecules - Evaluation [Page 104]

Chapter 7 Atoms and Molecules
Evaluation | Q IX. 3. | Page 104

Explain the need for a reference atom for atomic mass. Give some information about two reference atoms.

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Define atomic mass unit.

Choose the correct answer from the option given below.

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An element has atoms with different mass numbers.

Name or state the following:

Atoms of the same element differing in mass number

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