Question

What is the mass of: (a) 0.2 mole of oxygen atoms? (b) 0.5 mole of water molecules?

  • atoms and molecules CBSE Class 9
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Answer

(a) Mass of one mole of oxygen atoms = 16g

Then, mass of 0.2 mole of oxygen atoms = 0.2 × 16g = 3.2g

(b) Mass of one mole of water molecule = 18g

Then, mass of 0.5 mole of water molecules = 0.5 × 18g = 9g

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