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The formula shown below is used to calculate the energy released when a specific quantity of fuel is burned. Calculate the energy released by a burning sample of fuel if the temperature of 100g of water was raised by 20 °C. (Specific heat capacity of water = 4200J/kg °C)

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cryssatemp

Answer: 8400 J

Explanation:

The formula referenced in the question is:

[tex]Q=m. c. \Delta T[/tex]  

Where:

[tex]Q[/tex]  is the thermal energy

[tex]m=100g \frac{1 kg}{1000 g}=0.1 kg[/tex] is the mass  of the water sample

[tex]c=4200 \frac{J}{kg\°C}[/tex]  is the specific heat capacity of  water

[tex]\Delta T=20\°C[/tex]  is the variation in temperature

Solving:

[tex]Q=(0.1 kg)(4200 \frac{J}{kg\°C})(20\°C)[/tex]  

[tex]Q=8400 J[/tex]  This is the thermal energy released

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