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Question

Chemistry Question on Thermodynamics

An athlete is given 100g100\, g of glucose (C6H12O6)\left( C _6 H _{12} O _6\right) for energy This is equivalent to 1800kJ1800\, kJ of energy The 50%50 \% of this energy gained is utilized by the athlete for sports activities at the event In order to avoid storage of energy, the weight of extra water he would need to perspire is ___ gg (Nearest integer) Assume that there is no other way of consuming stored energy Given: The enthalpy of evaporation of water is 45kJmol145 \,kJ \,m o l^{-1} Molar mass of CH&OC H\, \&\, O are 12,1 and 16gmol116\, g \,mol ^{-1}

Answer

The correct answer is 360.
C6​H12​O6​(s)+6O2​→6CO2​(g)+6H2​O(l)
Extra energy used to convert H2​O(l) into H2​O(l) into H2​O(g)
=21800​=900kJ
⇒900=nH2​O​×45
nH2​O​=45900​=20 mole
WH2​O​=20×18=360g