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Introduction to Enthalpy of Reaction

AP Chemistry· difficulty 4/5

Burning 0.10 mol of fuel raises 500 g water by 20 °C (c = 4.18 J/g·°C). ΔH (kJ/mol) ≈

  • A

    −418 kJ/mol

    check_circle
  • B

    −21 kJ/mol

  • C

    −4180 kJ/mol

  • D

    −210 kJ/mol

Explanation

q_water = 500·4.18·20 = 41,800 J = 41.8 kJ. Per 0.10 mol → −418 kJ/mol.

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