# Chemistry

posted by .

a chemical engineer placed 1.520 g of a hydorcarbon in the bomb of a calorimeter. The bomb was immersed in 2.550 L of water and the sample was burned. The water temperature rose from 20.00C to 23.55C. If the calorimeter (excluding the water) had a heat capacity of 403 J/K, what was the heat released per gram of hydrocarbon?

I'm unsure of my work but here it is:

Q(bomb) = 403J/K * 3.55K = 1430.65J
Q(H2O) = 2.550L * (1000g/L) * 3.55K * (4.184J/gK) = 37875.66J
Q(hydrocarbon) = -Q(bomb) -Q(H2O)
Q(hydrocarbon) = -(1430.65J) - (37875.66J) = -39306.31J

1gram hydrocarbon = -39306.31J/1.520g = 25859.41J/g = 25900J/g

Does this seem right?

• Chemistry -

That looks ok to me although I didn't check the math.

## Similar Questions

1. ### chemistry

A hydrocarbon sample was burned in a bomb calorimeter. The temperature of the calorimeter and the 1.00 kg of water rose from 20.45°C to 23.65°C. The heat capacity of the calorimeter, excluding the water, is 2.21 kJ/°C. determine …
2. ### CHEMISTRY

A hydrocarbon sample was burned in a bomb calorimeter. The temperature of the calorimeter and the 1.00 kg of water rose from 20.45 °C to 23.65 °C. The heat capacity of the calorimeter, excluding the water, is 2.21 kJ/°C. Using this …
3. ### AP Chemistry

The heat of reaction for burning 1 mole of a certain compound X is known to be -477.7 kJ. The calorimeter constant of the bomb being used is 2500 j/degree celsius and the initial temperature of the water is 23.2 degrees celsius. a) …
4. ### chemistry

A hydrocarbon sample was burned in a bomb calorimeter. The temperature of the calorimeter and the 1.00 kg of water rose from 20.45 celsius to 23.65 celsius.The heat capacity of the caloimeter, excluding the water, is 2.21 kJ/degree …
5. ### Chemistry

2. When a 1.000 g sample of the rocket fuel hydrazine, N2H4, is burned in a bomb calorimeter which contains 1200g of water, the temperature rises from 24.62C to 28.16C. If the C for the bomb is 840 J/C Calculate: q reaction for combustion …
6. ### Chemistry

A 1.20g sample of benzoic acid is burned in excess of )2 in a bomb calorimeter immersed in 1300 g of water. The temperature of the water rises from 25 to 30.2 degrees C. The heat of combustion of benzoic acid is -26.4 kJ/g. The heat …
7. ### Chemistry

A 5.00g sample of octane is burned in a bomb calorimeter containing 200g of water. How much energy, in cal, is released if the water temperature increases 6.00C
8. ### chemistry

An alternative approach to bomb calorimetry is toestablish the heat capacity of the calorimeter, exclusive of the water it contains. The heat absorbed by the water and by the rest of the calorimeter must be calculated separately and …
9. ### chemistry

15. How much heat energy (in kJ) is evolved by a reaction in a bomb calorimeter in which the temperature of the bomb and water increased from 19.5 to 22.83 ºC?
10. ### chemistry

home / study / questions and answers / science / chemistry / a chemical engineer studying the properties of ... Question A chemical engineer studying the properties of fuels placed 1.760 g of a hydrocarbon in the bomb of a calorimeter …

More Similar Questions