Difficulty: Easy
Correct Answer: molarity
Explanation:
Introduction / Context:
Different analytical and process problems call for different concentration measures. Molarity is ubiquitous in laboratory work and reaction-rate expressions because it references the actual solution volume at the condition of interest.
Given Data / Assumptions:
Concept / Approach:
Identify the unit that matches “gram-moles per litre of solution.” This maps directly to molarity. Molality uses kilograms of solvent; normality uses equivalents per litre; equivalent weight is not a concentration unit.
Step-by-Step Clarification:
Verification / Alternative check:
Check typical notations: 1.0 M HCl means 1 mole HCl in each litre of final solution volume, consistent with the definition.
Why Other Options Are Wrong:
Common Pitfalls:
Interchanging molarity and molality; ignoring temperature effects on solution volume when high precision is needed.
Final Answer:
molarity
Discussion & Comments