Question

suppose the brain needs to metabolize about 4g of glucose(C₆H ₁₂O₆ )per hour. assuming glucose metabolism can approximated by the reaction below, how much energy does the brain uses per day C₆H ₁₂O₆   +O₆ = 6CO₂ + 6HO ₂O. DH_COMb -2808KJ/MOL

Answer 1

moles of glucose = 4 / 180 = 0.022

C₆H ₁₂O₆   + 6 O2 ------------------> 6CO₂ + 6H2O

1 mol of glucose ----------------- delta H comb = -2808 kJ/mol

0.022 mol of glucose --------------- ??

delta H = 0.022 x - 2808 / 1

             = 62.4 kJ/mol

62.4 kJ/mol ---------------- for 1 hour = 1/24 day

       ?? kJ /mol ---------------- 1 day

energy used = 1497.6 kJ/mol