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Mothballs are composed primarily of the hydrocarbon naphthalene (C10H8). When 1.025 g of naphthalene burns in a bomb calorimeter, the temperature rises from 24.25 C to 32.33 C. Find Erxn for the combustion of naphthalene. The heat capacity of the calorimeter, determined in a separate experiment, is 5.11 kJ> C.
$$\begin{array}{l}{=\frac{-41.29 \mathrm{kJ}}{1.025 \mathrm{g} \mathrm{C}_{10} H_{8}} \times \frac{128 \mathrm{gC}_{10} H_{8}}{1.0 \mathrm{mol} \mathrm{C}_{10} H_{8}}} \\ {=-5156 \mathrm{kJ} / \mathrm{mol}} \\ {=-5.2 \times 10^{3} \mathrm{kJ} / \mathrm{mol}}\end{array}$$
Chemistry 102
Chemistry 101
Chapter 9
Thermochemistry
Thermodynamics
Chemical reactions and Stoichiometry
Drexel University
Brown University
University of Toronto
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So in this problem we have one point zero two five grams of napfa lean burning in a calorie meter. And we want to determine what the energy of this is of the combustion off Napfa lean. And so the first thing we want to do is find the amount of moles of naphthalene. So we just divide by the Mueller Mass. One twenty eight point one seven zero five grams per mole and that'LL give us that. We have zero point zero zero seven nine nine seven moles. So now that we have the mole's, we want to find the amount of heat. And so in order to do that we take the ah specific heat of the calorie meter, which is five point one one killer Jules per degrees Celsius. And we multiply that by our delta T. And since we go from twenty four point two five to thirty two point three three, subtracting those two numbers will give us our change in temperature. And so when we multiply these together we get that we have forty one point two eight eight eight killer jewels of heat. And so now, to find Delta e of reaction, we just want to take our amount of heat divided by our number of malls to get what the doctor he is. And so this is going to be negative, since it's a combustion which is always extra thermic. And then we take our killer, Jules, forty one point two eight eight eight and divide that buyer zero point zero zero seven nine nine seven moles. And that will give us that We have negative five thousand one hundred sixty three killer Jules per mall, and that is our final answer for lt.
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