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 student must apply the correct formula and perform the calculation accurately.
Common mistake
Common Mistake in Substituting Values
Students often forget to include the correct units when substituting numerical values into algebraic equations.
Always ensure to write the units next to each numerical value during substitution to maintain clarity and accuracy.
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