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ChemistryNEET 2024Mole concept and molar mass

Some Basic Concepts of Chemistry

A compound X contains 32% of A, 20% of B and the remaining percentage of C. Then the empirical formula of X is (given atomic masses A = 64, B = 40, C = 32 u):

  1. A.ABC3\mathrm{ABC_3}✓
  2. B.AB2C2\mathrm{AB_2C_2}
  3. C.ABC4\mathrm{ABC_4}
  4. D.A2BC2\mathrm{A_2BC_2}

Solution

Moles per 100 g: A 3264=0.5\frac{32}{64} = 0.5, B 2040=0.5\frac{20}{40} = 0.5, C 4832=1.5\frac{48}{32} = 1.5. Ratio 1:1:31 : 1 : 3, so ABC3\mathrm{ABC_3}.

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