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Hydrogen has atomic mass 1 u and oxygen 16 u. The molecular mass of water is:
A16 u
B19 u
C18 u
D17 u
Answer & Solution
Correct answer: C. 18 u
1. Water has two hydrogen atoms and one oxygen atom.
2. Two times one plus sixteen is eighteen.
3. So the molecular mass is 18 u.
_Source: syllabus Science Class IX, Chapter 3, Atoms and Molecules._
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