Question detail
How many grams of sodium chloride (NaCl) are in 0.5 moles?
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. 29 g
- B. 58 g
- C. 35 g
- D. 70 g
Answer
29 g
Explanation
The relative formula mass of sodium chloride (NaCl) is 58.5 g/mol. Using the formula mass = moles x Mr, we find mass = 0.5 mol x 58.5 g/mol = 29.25 g, rounded to 29 g.
Common mistake
Misunderstanding Mole Ratios
Students often confuse the coefficients in a balanced equation as mass ratios instead of mole ratios.
Emphasize that coefficients represent the number of moles of each substance, not their masses. Practice interpreting balanced equations to reinforce this concept.
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