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Some Basic Concepts of Chemistry question

2023 · Q91
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Some Basic Concepts of Chemistry question

2023 · Q91

NEETChemistrySome Basic Concepts of ChemistryMCQ+4 / −1

The density of 1 M solution of a compound 'X' is 1.25 g mL−1^{-1}−1. The correct option for the molality of solution is (Molar mass of compound X = 85 g):

  1. A
    0.705 m
  2. B
    1.208 m
  3. C
    1.165 m
  4. D
    0.858 m
View written solutionFree

Correct answer: D

$$\begin{aligned} & \mathrm{m}=\frac{1000 \times \mathrm{M}}{1000 \times \mathrm{d}-\mathrm{MM}_{\mathrm{w}}} \\ & \mathrm{m}=\frac{1000 \times 1}{1000 \times 1.25-1 \times 85} \\ & \mathrm{~m}=\frac{1000}{1165}=0.858\end{aligned}$$

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