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 formula correctly to find the number of moles in a given mass of a substance.
Common mistake
Changing the Subject of Equations
Students often forget to correctly rearrange the equation when changing the subject, leading to incorrect calculations.
Practice rearranging equations step-by-step, ensuring to isolate the variable of interest while maintaining the equality.
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