Maharashtra BoardEnglish MediumSTD 9ScienceMeasurement of Matter1 Mark
Question
Explain with examples what is meant by a ‘mole’ of a substance.
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Answer
A mole is that quantity of a substance whose mass in grams is equal in magnitude to the molecular mass of that substance in Daltons.
For example: Atomic mass of oxygen atom ( O $)$ is 16 u . Thus, the molecular mass of oxygen molecule $\left( O _2\right)$ is $16 \times 2=32 u$. Therefore, 32 g of oxygen is 1 mole of oxygen.
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