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18 April, 02:17

A sample of benzene was vaporized at 25◦C. When 37.5 kJ of heat was supplied, 95.0 g of the liquid benzene vaporized. What is the enthalpy of vaporization of benzene at 25◦C?

1. 30.8 kJ/mol

2. 13.4 kJ/mol

3. 43.0 kJ/mol

4. 6.09 kJ/mol

5. 25.6 kJ/mol

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Answers (1)
  1. 18 April, 02:51
    0
    Enthalpy of vaporization = 30.8 kj/mol

    Explanation:

    Given dа ta:

    Mass of benzene = 95.0 g

    Heat evolved = 37.5 KJ

    Enthalpy of vaporization = ?

    Solution:

    Molar mass of benzene = 78 g/mol

    Number of moles = mass / molar mass

    Number of moles = 95 g / 78 g/mol

    Number of moles = 1.218 mol

    Enthalpy of vaporization = 37.5 KJ/1.218 mol

    Enthalpy of vaporization = 30.8 kj/mol
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