Which of the following is the molecular mass of HNO3?
63 u
The correct answer is option 3 I.e. 63 u.
Thee molecular mass of HNO₃ (Nitric Acid) is indeed 63 u (unified atomic mass units).
Hydrogen (H): Atomic mass = 1 u
Nitrogen (N): Atomic mass = 14 u
Oxygen (O): Atomic mass = 16 u
(There are 3 oxygen atoms in HNO₃) So, the molecular mass is calculated as:
Molecular mass of HNO₃ = (1 × 1 ) + ( 1 × 14 ) + ( 3 × 16 ) = 1 + 14 + 48=63 u
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