Question detail
A reaction produces 10 grams of sodium chloride (NaCl). Calculate the number of moles of NaCl produced. 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
Question
Type
exam_style
Style
Topic
Use of amount of substance in relation to masses of pure substances
Question
A reaction produces 10 grams of sodium chloride (NaCl). Calculate the number of moles of NaCl produced. The relative formula mass (Mr) of NaCl is 58.5 g/mol.
Answer
0.171 mol
Explanation
This question assesses the ability to calculate moles from mass using the formula moles = mass / Mr. It reinforces understanding of stoichiometry in chemical reactions.
Common mistake
Confusing Mole Symbol
Students often write 'M' instead of 'mol' when stating the unit for moles.
Remember that the correct symbol for the unit mole is 'mol', not 'M'. Keep the correction anchored to Moles (HT only); check formula, substitution, calculation, final answer, and unit where relevant.
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