Answer:
18,8kg of wood
Explanation:
The energy you need to to raise the temperature of 1000 kg of water from 25.0 to 100.0 °C is:
q = C×m×ΔT
Where: q is heat, C is specific heat of water (4,184J/g°C), m is mass in grams (1000x10³g), and ΔT is 100,0°C - 25,0°C = 75,0°C
Replacing:
q = 4,184J/g°C×1000x10³g×75,0°C
<u><em>q = 3,14x10⁸ J of heat are required</em></u>
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Now, if the heating value of dry wood is 16,72 MJ/kg = 16,72x10⁶ J/kg, mass of wood required is:
3,14x10⁸J × (1kg / 16,72x10⁶ J) = <em>18,8 kg of wood are required</em>
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I hope it helps!
