Question detail
A sample of sodium chloride (NaCl) has a mass of 58.5 grams. Calculate the number of moles of NaCl in the sample. The relative formula mass (Mr) of NaCl is 58.5.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Use of amount of substance in relation to masses of pure substances
Question
A sample of sodium chloride (NaCl) has a mass of 58.5 grams. Calculate the number of moles of NaCl in the sample. The relative formula mass (Mr) of NaCl is 58.5.
Answer
1 mol
Explanation
This question assesses the understanding of how to calculate moles from mass using the relative formula mass. The mass of the sample is equal to its Mr, resulting in a clear calculation.
Common mistake
Confusing Avogadro's Constant
Students often forget to express Avogadro's constant in standard form, writing it as 602000000000 instead of 6.02 x 10^23.
Always convert large numbers into standard form when dealing with constants like Avogadro's constant to maintain clarity and accuracy.
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