Answer
$6.0\times10^6J$
Work Step by Step
Use equation 14–2. One liter of water has a mass of 1 kg.
$$Q=mc\Delta T=(18kg)(\frac{4186J}{kg\cdot C^{\circ}})(95^{\circ}C-15^{\circ}C)=6.0\times10^6J$$
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