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Some Basic Concepts of Chemistry question

2019 · 10 Jan · Shift 2 · Q16
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Some Basic Concepts of Chemistry question

2019 · 10 Jan · Shift 2 · Q16

JEE MainChemistrySome Basic Concepts of ChemistryMCQ+4 / −1
The amount of sugar (C12H22O11C_{12}H_{22}O_{11}C12​H22​O11​) required to prepare 2L of its 0.1 M aqueous solution is :
  1. A
    17.1 g
  2. B
    34.2 g
  3. C
    68.4 g
  4. D
    136.8 g
View written solutionFree

Correct answer: C

  1. Use the molarity formula

    M=nVM = \frac{n}{V}M=Vn​

    where:

    • M=0.1 MM = 0.1\,\text{M}M=0.1M
    • V=2 LV = 2\,\text{L}V=2L
    • nnn = number of moles

  2. Calculate moles of sugar required

    n=M×V=0.1×2=0.2 moln = M \times V = 0.1 \times 2 = 0.2\,\text{mol}n=M×V=0.1×2=0.2mol

  3. Find molar mass of sugar C12H22O11C_{12}H_{22}O_{11}C12​H22​O11​

    12×12+22×1+11×1612 \times 12 + 22 \times 1 + 11 \times 1612×12+22×1+11×16

    =144+22+176=342 g mol−1= 144 + 22 + 176 = 342\,\text{g mol}^{-1}=144+22+176=342g mol−1

  4. Calculate required mass

    mass=n×molar mass\text{mass} = n \times \text{molar mass}mass=n×molar mass

    =0.2×342=68.4 g= 0.2 \times 342 = 68.4\,\text{g}=0.2×342=68.4g

  5. Match with options

    68.4 g68.4\,\text{g}68.4g corresponds to Option C.

Final Answer: C. 68.4 g68.4\,\text{g}68.4g

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