Question

A 0.373-g sample of naphthalene (C10H8) is burned in a bomb calorimeter and the temperature increases...

A 0.373-g sample of naphthalene (C10H8) is burned in a bomb calorimeter and the temperature increases from 24.90 °C to 27.80 °C. The calorimeter contains 1.05E3 g of water and the bomb has a heat capacity of 836 J/°C. Based on this experiment, calculate ΔE for the combustion reaction per mole of naphthalene burned (kJ/mol).

Homework Answers

Answer #1

C10H8 (s) + 12 O2 (g) ---> 10 CO2 (g) + 4 H2O (g) + heat

From the data, the number of moles of Naphthalene used is:

Molar mass of C10H8 = 128.2g/mol

Moles of C10H8 = 0.373 g / 128.2 g/mol = 2.90 * 10-3mol

The change in temperature is:

27.80 °C - 24.90 °C = 2.9 °C

If only the calorimeter changed temperature (no outside loss or water jacket), then the change in heat energy is: (1KJ = 1000J)

ΔE = 2.9 °C * 836 J/°C = 2424.4 J/°C = 2.42 KJ

To get the ΔErxn (per mole) for the combustion, divide the ΔE above by the moles of C10H8 used.

As heat of combustion is negative,Therefore

ΔErxn (per mole) for the combustion = - (2.42 KJ ) / (2.90 * 10-3mol) = -8.36*10-4 KJ/mol

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A 0.287-g sample of bianthracene (C28H18) is burned in a bomb calorimeter and the temperature increases...
A 0.287-g sample of bianthracene (C28H18) is burned in a bomb calorimeter and the temperature increases from 25.30 °C to 27.50 °C. The calorimeter contains 1.03E3 g of water and the bomb has a heat capacity of 856 J/°C. Based on this experiment, calculate ΔE for the combustion reaction per mole of bianthracene burned (kJ/mol).
. A 0.500 g sample of naphthalene (C10H8) is burned in a bomb calorimeter containing 650...
. A 0.500 g sample of naphthalene (C10H8) is burned in a bomb calorimeter containing 650 grams of water at an initial temperature of 20.00 oC. After the reaction, the final temperature of the water is 26.4ºC. The heat capacity of the calorimeter is 420 J/oC. Using these data, calculate the heat of combustion of naphthalene in kJ/mol.
A 0.553-g sample of diphenyl phthalate (C20H14O4) is burned in a bomb calorimeter and the temperature...
A 0.553-g sample of diphenyl phthalate (C20H14O4) is burned in a bomb calorimeter and the temperature increases from 24.40 °C to 27.57 °C. The calorimeter contains 1.08×103 g of water and the bomb has a heat capacity of 877 J/°C. The heat capacity of water is 4.184 J g-1°C-1. Based on this experiment, calculate ΔE for the combustion reaction per mole of diphenyl phthalate burned. ______ kJ/mol
A 12.8 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter with a heat...
A 12.8 g sample of ethanol (C2H5OH) is burned in a bomb calorimeter with a heat capacity of 5.65 kJ/°C. The temperature of the calorimeter and the contents increases from 25°C to 35°C. What is the heat of combustion per mole of ethanol? The molar mass of ethanol is 46.07 g/mol. C2H5OH (l) + 3 O2 (g) -----> 2 CO2 (g) + 3 H2O (g) ΔE = ?
A 1.000 g sample of octane (C8H18) is burned in a bomb calorimeter containing 1200 grams...
A 1.000 g sample of octane (C8H18) is burned in a bomb calorimeter containing 1200 grams of water at an initial temperature of 25.00ºC. After the reaction, the final temperature of the water is 33.20ºC. The heat capacity of the calorimeter (also known as the “calorimeter constant”) is 837 J/ºC. The specific heat of water is 4.184 J/g ºC. Calculate the heat of combustion of octane in kJ/mol.
1. A bomb calorimeter, or a constant volume calorimeter, is a device often used to determine...
1. A bomb calorimeter, or a constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods. In an experiment, a 0.4137 g sample of bianthracene (C28H18) is burned completely in a bomb calorimeter. The calorimeter is surrounded by 1.361×103 g of water. During the combustion the temperature increases from 24.82 to 27.25 °C. The heat capacity of water is 4.184 J g-1°C-1. The heat capacity of the calorimeter...
The combustion of 0.1567 g benzoic acid increases the temperature of a bomb calorimeter by 2.57°C....
The combustion of 0.1567 g benzoic acid increases the temperature of a bomb calorimeter by 2.57°C. Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic acid is 26.42 kJ/g.)A 0.2156-g sample of vanillin (C8H8O3) is then burned in the same calorimeter, and the temperature increases by 3.28°C. What is the energy of combustion per gram of vanillin? Per mole?
A bomb calorimeter, or a constant volume calorimeter, is a device often used to determine the...
A bomb calorimeter, or a constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods. In an experiment, a 1.4170 g sample of L-ascorbic acid (C6H8O6) is burned completely in a bomb calorimeter. The calorimeter is surrounded by 1.354×103 g of water. During the combustion the temperature increases from 24.92 to 27.68 °C. The heat capacity of water is 4.184 J g-1°C-1. The heat capacity of the calorimeter...
If 4.40 g of glucose are burned in a bomb calorimeter, the temperature of the 800...
If 4.40 g of glucose are burned in a bomb calorimeter, the temperature of the 800 g of water in the calorimeter increases from 15.0∘C to 18.7∘C. If the heat capacity of the calorimeter is 550J∘C, what is the value of q for the combustion of the glucose sample?
A sample of solid azulene (C10H8) that weighs 0.4925 g is burned in an excess of...
A sample of solid azulene (C10H8) that weighs 0.4925 g is burned in an excess of oxygen to CO2(g) and H2O() in a constant-volume calorimeter at 25.00 °C. The temperature rise is observed to be 2.150 °C. The heat capacity of the calorimeter and its contents is known to be 9.455×103 J K-1. (a) Write and balance the chemical equation for the combustion reaction. Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (aq) or...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT