Q 9. What is the mass of:
(b) 0.5 mole of water molecules?
The mass of 1 mole of water molecules = 18 g
Thus,
the mass of 0.5 mole of water molecules = 18 x 0.5
= 9.0 g
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CBSE Class 10 exams twice a year from 2026; 64.4% students in favor, second attempt optional
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