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Hello, I'm trying to work out the following - Q - The butane cylinder contains 7.0 kg of liquefied gas, Calculate the mass of wood

Hello, I'm trying to work out the following - Q - The butane cylinder contains 7.0 kg of liquefied gas, Calculate the mass of wood that would be needed to provide the same amount of useful heating energy as the butane cylinder

Butane = 45 MJ kg ^-1 - Efficiency of butane stove = 45%

Wood (air-dry, 20% moisture) = 15 MJ kg^-1- Efficiency of wood fire = 15%

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