of HCl is mixed with of NaOH. The temperature rises by . Assuming and , what is the enthalpy change of neutralisation?

Answer and explanation

Correct answer: C.

  1. Step 1: Mass of solution g, so J.
  2. Step 2: Moles of water formed mol.
  3. Step 3: (exothermic).
Answer
.
Why not the others: : has the wrong sign: a temperature rise means the reaction is exothermic. : divides by mol instead of mol of water formed. : gives the heat transferred and does not divide by moles.

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