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NTA Abhyas JEE Main2020ChemistryThermodynamics (C)Practice

The molar heat capacity of water at constant pressure, C P is 75 J K - 1 m o l - 1 . When 10 kJ of heat is supplied to 1 kg water which is free to expand, the increase in temperature of water is

Options

  1. A2.4 K
  2. B4.8 K
  3. C3.3 K
  4. D7.2 K

Correct answer

A. 2.4 K

Step-by-step solution

q m = mc ΔT q m = 10 kJ or 10000 J, m = 1000 g c = 75 J K - 1 m o l - 1 . Number of moles = 1000 18 = 55.5 m o l ΔT = 10000 55 .5 × 75 = 2 .4 K

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