Whenever an acid is neutralized by a base, the net reaction is
`H^(o+) (aq) + bar(O)H(aq) to H_(2)O(l) (l) , Delta H = -57.1 kJ`.
Calculate the heat evolved for the following experiment?
100 mL of 0.2 M HCl is mixed with 100 mL of 0.3 M NaOH solution.

Explanation

To calculate the heat evolved when 100 mL of 0.2 M HCl is mixed with 100 mL of 0.3 M NaOH, we can follow these steps:

### Step 1: Calculate the number of millimoles of HCl and NaOH
- **HCl**:
\[ \text{Number of millimoles of HCl} = \text{Volume (mL)} \times \text{Molarity (M)} = 100 \, \text{mL} \times 0.2 \, \text{M} = 20 \, \text{mmol} \]

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