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.

-5.16 × 10³ kJ/mol

Explanation:

According to the law of conservation of the energy, the sum of the heat released by the combustion and the heat absorbed by the bomb calorimeter is zero.

Qcomb + Qcal = 0

Qcomb = - Qcal   [1]

The heat absorbed by the calorimeter (Qcal) can be calculated using the following expression.

Qcal = Ccal . ΔT

where,

Ccal is the heat capacity of the bomb calorimeter

ΔT is the change in the temperature

From [1],

Qcomb = -Qcal = -(5.11 kJ/°C) × (32.33°C - 24.25°C) = -41.3 kJ

Let's consider the molar mass of naphthalene to be 128.17 g/mol. The change in the internal energy (∆Erxn) for the combustion of naphthalene is:

okay i have so many questions. but the big one here is: um wt..f is this mess? ?

u can delete ur account.

1. go on google and write

2 open this and click on your profile pic and if your profile is not appearing, then u have to log in.

3. when u click on your profile pic, there appears four options on the top.

4. click on the 1st option and scroll down and go at the bottom.

5. click on edit profile.

6. there appears a option 'prefernces' and at that option at the right side , 'edit' is written.

7. click on the edit option.

8. there is a option " i want to delete my account" and click on that.

hope this u

and ur welcm

: )