Butane is a volatile liquid fuel that can be used in camping stoves. If you are planning a wilderness trek, you might need to assess how much butane you need to transport. How much butane should a backpacker carry to boil 1 L of water? Calculate the mass of butane that you would need to burn to obtain 350. kJ of heat, which is just enough energy to heat 1 L of water from 17 °C to boiling at sea level (if all heat losses are ignored). The thermochemical equation is

ANTICIPATE From experience, you might suspect that only a few grams of fuel will be required.

PLAN The first step is to convert heat output required into moles of fuel molecules by using the thermochemical equation. Then use the molar mass of the fuel to convert from moles of fuel molecules into a mass in grams.

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2 C4H1₁0 (g) 13 O₂(g) 8 CO₂(g) + 10 H₂O(1) AH° : = -5756 kJ