Question detail
What is the mass of 3 moles of sodium chloride (NaCl)? The relative formula mass (Mr) of NaCl is 58.5 g/mol.
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. 175.5 g
- B. 58.5 g
- C. 3 g
- D. 174 g
Answer
175.5 g
Explanation
To find the mass, multiply the number of moles by the relative formula mass. 3 mol x 58.5 g/mol = 175.5 g.
Common mistake
Rearranging the Equation
Students often confuse the rearrangement of the equation linking mass, relative formula mass, and moles, leading to incorrect formulas.
To rearrange the equation correctly, remember that mass = moles x relative formula mass. Ensure you isolate the variable you need by performing inverse operations.
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