J 1m0l and that of sucrose is -2226.1 kJ mol-1. (Use H2O(1) in the balanced chem
ID: 706540 • Letter: J
Question
J 1m0l and that of sucrose is -2226.1 kJ mol-1. (Use H2O(1) in the balanced chemical equations because the metab- olism of these compounds produces liquid water.) 104. Hydrogen and methanol have both been proposed as alterna- tives to hydrocarbon fuels. Write balanced reactions for the complete combustion of hydrogen and methanol and use stan- dard enthalpies of formation to calculate the amount of heat released per kilogram of the fuel. Which fuel contains the most energy in the least mass? How does the energy of these fuels compare to that of octane (CgH18)? 105. Dervea,relationship between ?? and ? U for a process in which the temperature of a fixed amount of an ideal gas changes. 106. Under certain nonstandard conditions, oxidation by O2(g) of 1 mol of SO2(8) to SO3(8) absorbs 89.5 kJ. The enthalpy of formation of SO3(g) is-204.2 kJ mol-1 under these conditions. Find the enthalpy of formation of SO2(8). 107. One tablespoon of peanut butter has a mass of 16 g. It is com- busted in a calorimeter whose heat capacity is 120.0 kJoc The temperature of the calorimeter rises from 22.2 °C to 25.4 °C Find the food caloric content of peanut butter. sealed evacuated container made of a perfect insulating materi at 25 °C. The mixture is ignited with a spark and it reacts to for liquid water. Find the temperature of the water. 108. A mixture of 2.0 mol of H2(8) and 1.0 mol of O-(8) is placed inExplanation / Answer
107)
heat released by combusion of butter = heat capacity x temp change
= 120 (kJ/C) x (25.4 - 22.2) C
= 384 kJ
given
mass of peanut butter = 16 g
so
food caloric content = 384 kJ / 16 g
food caloric content = 24 kJ/g
so
the food caloric content is 24 kJ per gram of peanut butter
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