Problem- when backpacking in the wilderness hikers often, Ask an Expert

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Problem- When backpacking in the wilderness, hikers often boil water to sterilize it for drinking. Suppose that you are planning a backpacking trip and will need to boil 31L of water for your group.

What volume of fuel should you bring? Assume each of the following: the fuel has an average formula of C7H16; 15% of the heat generated from combustion goes to heat the water (the rest is lost to the surroundings); the density of the fuel is 0.78 g/mL; the initial temperature of the water is 25.0 ?C; and the standard enthalpy of formation of C7H16 is -224.4 kJ/mol.

I just need a general explanation of it please- Thanks!

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