Concept:The relationship between moles and physical substance depends on the fundamental stoichiometric equation relating amount, mass, and molar mass.
Formula:$$ n = \frac{m}{M} $$
Solution:- In the equation \( n = m / M \), \( n \) represents the number of moles, \( m \) represents the physical given mass, and \( M \) represents the constant molar mass.
- Since \( M \) (molar mass) is a constant for any specific element, \( n \) is positioned in the numerator with respect to \( m \).
- Therefore, as the physical mass (\( m \)) increases, the number of moles (\( n \)) increases in direct proportion.
Why other options are incorrect:- Molar mass of an element: Moles are inversely proportional to molar mass (it is in the denominator). A heavier element yields fewer moles for the same mass.
- Empirical / Formula mass: These relate to compounds, not pure elements, and would also be inversely proportional regardless.
Quality & Fidelity Assurance:
Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.