Question detail
If 10 grams of NaCl are dissolved in water, how many moles of NaCl are present? (Mr of NaCl = 58.5)
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Use of amount of substance in relation to masses of pure substances
Question
- A. 0.17 moles
- B. 0.25 moles
- C. 0.50 moles
- D. 0.75 moles
Answer
0.17 moles
Explanation
Using the formula moles = mass / Mr, we find that 10 g of NaCl corresponds to approximately 0.17 moles.
Common mistake
Confusing Mole Ratios
Students often confuse mole ratios from coefficients in balanced equations with mass ratios, leading to incorrect calculations.
To fix this, always refer to the coefficients in the balanced equation for mole ratios and ensure you are using moles, not masses, in your calculations.
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