Question detail
Calculate the number of moles in 50 grams of water (H2O). The relative formula mass (Mr) of water is 18 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
Calculate the number of moles in 50 grams of water (H2O). The relative formula mass (Mr) of water is 18 g/mol.
Answer
2.78 mol
Explanation
This question tests the ability to use the formula for calculating moles from mass. The calculation shows how to apply the relative formula mass to find the number of moles in a given mass of a substance.
Common mistake
Confusing Mass and Moles
Students often confuse mass (in grams) with the number of moles when calculating the amount of substance.
Always remember to use the formula: moles = mass / relative formula mass, ensuring you convert mass to the correct unit before calculation.
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