Question

A camper stranded in snowy weather loses heat by wind convection. The camper is packing emergency rations consisting of 55 % sucrose, 31 % fat, and 14 % protein by weight. Assume that the enthalpies for combustion of fat and protein are −39.13kJ⋅g−1 and −22.0kJ⋅g−1, respectively. The enthalpy for combustion of sucrose is −5643kJ⋅mol−1.

What mass of emergency rations must the camper consume in order to compensate for a reduction in body temperature of 4.5 K? Assume the heat capacity of the body equals that of water (75.3 J⋅mol−1⋅K−1), and assume the camper weighs 80 kg.

Express your answer to two significant figures and include the appropriate units.

Answer 1

255/Sun s Rain-042) 308t Amownt Heal Releanel 12363--90741 Mf 564 3r/. Fat 6.91/-9.) Fp3k,i Hont lna b 342 3 907-1213-308--2428k some OHeit Lot due tRduction inmntna K Uaing 9-sat ormul 80xI03 (80-10753x 5S06 kJ

So, the Camper needs (1506÷24.28)= 62.03 grams of Emergency Rations in order to compensate the Body Temperature Reduction of 4.5K