An athlete is given 100g of glucose (C6H12O6) for energy, which is equivalent to 1800kJ of energy. If 50% of this energy is utilized for activities, the weight of extra water needed to perspire is _____ g. (Nearest integer)
Given: Enthalpy of evaporation of water = 45kJ/mol; molar masses: C=12g/mol, H=1g/mol, O=16g/mol.