If \(0.125\) mol of a solute has a mass of \(5\,\mathrm{g}\), what is its molar mass?
Answer and explanation
Correct answer: \(40\,\mathrm{g\,mol^{-1}}\)
Molar mass is the mass of one mole and is calculated using \(M=m/n\), where \(m\) is the sample mass and \(n\) is the amount in moles. Substituting the given values gives \(M=5\,\mathrm{g}/0.125\,\mathrm{mol}=40\,\mathrm{g\,mol^{-1}}\). The units are grams per mole, as required. Therefore, option B is correct.
Frequently asked questions
What is the correct answer to this question?
\(40\,\mathrm{g\,mol^{-1}}\)
Why is this the correct answer?
Molar mass is the mass of one mole and is calculated using \(M=m/n\), where \(m\) is the sample mass and \(n\) is the amount in moles. Substituting the given values gives \(M=5\,\mathrm{g}/0.125\,\mathrm{mol}=40\,\mathrm{g\,mol^{-1}}\). The units are grams per mole, as required. Therefore, option B is correct.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Some Basic Concepts of Chemistry. Topic: Mole concept and molar mass.
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