This question-specific review guide is tied to the answer reasoning for a PracticeTestVault item. Use it after you answer the question so the review stays focused on what the prompt actually tested.
What this question is testing
Objective: Calculate molarity of a solution
Prompt focus: What is the molarity of a solution made by dissolving 0.50 mol of solute in enough water to make 2.0 L of solution?
Why the correct answer works
0.25 M
0.50 mol divided by 2.0 L gives a molarity of 0.25 M.
Why the tempting wrong answer fails
The tempting wrong answer usually loses because it skips the key condition, priority, or evidence in the prompt.
Plain-language takeaway
Molarity equals moles of solute divided by liters of solution. Dividing 0.50 mol of solute by 2.0 L of solution yields a concentration of 0.25 M.
Simple analogy
Think of calculate molarity of a solution like following a short checklist: identify the clue, confirm the rule, and then make the move that fits this exact scenario.
How to review it before a retake
- Underline the command word and name what the question is asking before rereading the choices.
- Compare the correct answer against the closest distractor and write the exact detail that separates them.
- Retest this objective with a fresh question without looking at the rationale first.