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Some Basic Concepts of Chemistry — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistrySome Basic Concepts of Chemistry1 Mark
MCQ
Which of the following terms are unitless?
  • A
    Molality.
  • B
    Molarity.
  • C
    Mole fraction.
  • D
    Mass percent.
✓

Answer

  1. Mole fraction.
  2. Mass percent.

Explanation:

Mole fraction,

$\text{x}_\text{A}=\frac{\text{n}_\text{A}}{\text{n}_\text{A}+\text{n}_\text{B}}=\frac{\text{Mole of component}}{\text{Total number of moles}}\text{(unitless)}$

Mass percentage $\frac{\text{Mass of component}}{\text{Total mass}}\times100\text{(unitless)}$

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