NEET Chemistry Atomic & Molecular Mass MCQ Question
Which of the following statements about atomic and molecular mass is correct?
The atomic mass of an element is defined as the weighted average mass of its isotopes based on their natural abundance.
Molecular mass is always a whole number and does not include any decimal points.
One mole of any substance contains exactly 6.022 × 10^23 molecules, regardless of the substance's mass.
The empirical formula of a compound is determined solely by the atomic mass of its constituent elements.
Correct Answer
Detailed Explanation
The atomic mass of an element is indeed the weighted average of the masses of its isotopes, taking into account their natural abundances, as mentioned in the context. Option B is incorrect because molecular mass can be a decimal. Option C is misleading as it does not mention the mass of the substance. Option D is incorrect since the empirical formula is based on the simplest ratio of atoms, not just atomic mass.
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