AP EAMCET · Chemistry · Some Basic Concepts of Chemistry
If the density of a \(5 \mathrm{M}\) solution of \(\mathrm{KCl}\) is \(1.26 \mathrm{~g} \mathrm{~mL}^{-1}\), then find the molality of the solution. (molecular mass of \(\mathrm{KCl}\) \(=74.55 \mathrm{~g} \mathrm{~mol}^{-1}\) )
- A \(0.74 \mathrm{~m}\)
- B \(1.26 \mathrm{~m}\)
- C \(7.45 \mathrm{~m}\)
- D \(3.38 \mathrm{~m}\)
Answer & Solution
Correct Answer
(D) \(3.38 \mathrm{~m}\)
Step-by-step Solution
Detailed explanation
5 molar solution means there are 5 moles of \(\mathrm{KCl}\) salt in \(1 \mathrm{~L}\). Molecular weight of \(\mathrm{KCl}=74.55 \mathrm{~g} \mathrm{~mol}^{-1}\) Hence, there are \(5 \times 74.55 \mathrm{~g}\) in \(1 \mathrm{~L}\) of water…
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