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ghostanime2001
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Homework Statement
An aluminum engine block has a mass of 110 kg. If only 20% of the heat produced in the engine is available to heat the block, what mass of octane is required to raise the temperature of this block from 15 celcius to 85 degrees celcius? c(Al) = 0.9 kJ/(kg . degrees celcius)
Homework Equations
[tex]\Delta[/tex]H=mc[tex]\Delta[/tex]T
The Attempt at a Solution
[tex]\Delta[/tex]H=(110kg)(0.9)(85-15)=(110kg)(0.9)(70)=6930 kJ x 0.2 % = 1386 kJ
Im clueless as to find the mass of octane after this step :(