Post-Laboratory Questions
Use the spaces provided for the answers and additional paper if necessary.
1. Although the composition of peanuts is complex, one of the primary components is peanut oil,
which has the chemical formula $C_{57}H_{104}O_6$. Balance the following equation for the combustion of pea-
nut oil.
$C_{57}H_{104}O_6(l) + O_2(g) \rightarrow CO_2(g) + H_2O(g)$
2. Now that you have completed the experiment, think back on the experimental setup, and suggest
two changes you could make to improve the accuracy of your determination. Briefly explain the basis
for each change.
(a)
(b)
3. In this experiment, it is impossible to transfer all of the energy released by the combustion reaction
to the water in the calorimeter. Some energy will be lost to the surroundings, no matter how careful we
are. Assume for a moment, however, that your experimental setup was perfect, that the peanut half
burned completely, and that all of the energy released by the combustion reaction was transferred to
the water in the can. Given these conditions, should your determination of the number of Calories per
gram of peanut be identical to the number printed on the peanut container label? Briefly explain.
