A bicyclist consumes 9.0 L of water over the span of 3.5 hours during a race. Making

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A bicyclist consumes 9.0 L of water over the span of 3.5 hours during a race. Making the approximation that 80% of the cyclist's energy goes into evaporating this water (at 20°C) as sweat, how much energy in kcal did the rider use during the ride?
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