Answer:
17000 joules
Explanation:
With knowledge of the specific heat capacity of a substance, its mass, and the temperature change, we can convert this to the energy required for this temperature change using:
<span>ΔH=mCΔT</span>, where
<span>ΔH=</span>change in enthalpy (J)
<span>m=</span> mass of substance being heated (g) i.e. water in this question
<span>C=</span> specific heat capacity (J/g°C)
<span>ΔT=</span> change in temperature (°C)
We know mass<span>=65g</span> and <span>ΔT=76°C−12°C=64°C</span>
The specific heat capacity of water is 4.18J/g°C
Therefore, <span>ΔH=65g⋅<span><span>4.18J</span><span>g°C</span></span>⋅64<span>°C</span></span>
<span>=17388.8J</span>
<span>=17000J</span> (2 significant figures)
