In CHCl₃, bond length of C-Cl is 176.7 pm and covalent radius of Cl atom is 99.4 pm, the covalent radius of carbon atom is:
Correct answer: C. 77.3 pm
- A. 66.3 pm
- B. 276.1 pm
- C. 77.3 pm
- D. 175.4 pm
Explanation
The covalent radius of an atom is half the distance between two identical atoms joined by a single covalent bond. In a molecule with different atoms, like CHCl₃, the bond length between the atoms is approximately the sum of their covalent radii. CalculationGiven:Bond length of C-Cl = 176.7 pmCovalent radius of Cl = 99.4 pmWe can use the following formula:Bond length (C-Cl) = Covalent radius (C) + Covalent radius (Cl)Rearranging the formula to solve for the covalent radius of carbon:Covalent radius (C) = Bond length (C-Cl) - Covalent radius (Cl)Plugging in the given values:Covalent radius (C) = 176.7 pm - 99.4 pm = 77.3 pmTherefore, the covalent radius of the carbon atom in CHCl₃ is approximately 77.3 pm.
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About Bond Energy
Bond energy is the energy needed to break one mole of a particular covalent bond in gaseous molecules, while bond formation releases energy. Reaction enthalpy is estimated by subtracting the total energy of bonds formed from bonds broken, with attention to average bond energies and their limitations for specific molecules.
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