One mole of CCl₄ contains 4 moles of Cl atoms. Thus 0.5 mol contains 2 mol Cl atoms.
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The mass of one atom of an element is 2.66 × 10⁻²³ g. The atomic mass of the element is approximately
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During the reaction 2H₂S + SO₂ → 3S + 2H₂O, sulphur produced from 1 mole of H₂S has a mass of