Homework Answers
1. This is in order to determine the calorimeter constant necessary to determine the heat of combustion of the substance you need to find.
The equation used is: Enthalpy of combustion * moles of benzoic acid = calorimeter constant * Temperature Change
2. Enthalpy of combustion = Heat of combustion / moles of substance
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1. Why is it necessary to use benzoic acid, considered as a compound with a known...
Bomb calorimetry is a technique used to determine the enthalpy of combustion, usually in O2, of...
Bomb calorimetry is a technique used to determine the enthalpy of combustion, usually in O2, of a chemical species. A known amount of compound is placed inside a fixed volume container that is, in turn, filled with oxygen at a high enough pressure to ensure complete combustion. The fixed-volume container (the 'bomb') is then inserted into a bucket containing a precisely known volume of water. The oxygen and compound are ignited, and the temperature change in the water is recorded....
(1) (3 points ) A 1.21 g sample of benzoic acid, C7H602, is combusted in a...
(1) (3 points ) A 1.21 g sample of benzoic acid, C7H602, is combusted in a bomb calorimeter in an oxygen rich environment. The calorimeter has a heat capacity of 1365 J/°C, and additionally contains 1.30 kg of water surrounding the bomb. The heat of combustion for benzoic acid is AH° = -3227 kJ per mole of benzoic acid. The initial temperature of the calorimeter and water is 22.5 °C. a. (1 point) What is the balanced chemical reaction that...
Benzoic acid is used to determine the heat capacity of bomb calorimeters because it can be...
Benzoic acid is used to determine the heat capacity of bomb calorimeters because it can be obtained in pure form and its enthalpy of combustion is known very accurately (-26.43 KJ/g). Determine the heat capacity of a calorimeter that had a temperature increase of 7.250°C when 2.500 g of benzoic acid was used. Select one: a.-9.114 kJ/°C b.-18.23 kJ°C c. 18.23 kJ°C d. 4.557 kJ/°C e. 9.114 kJ°C
The enthalpy of combustion of benzoic acid ( CH2COOH) is commonly used as the standard for...
The enthalpy of combustion of benzoic acid ( CH2COOH) is commonly used as the standard for calibrating constant-volume bomb calorimeters; its value has been accurately determined to be -3226.7 kJ/mol. When 3.2157 g of benzoic acid are burned in a calorimeter, the temperature rises from 21.84°C to 24.67°C. What is the heat capacity of the bomb? (Assume that the quantity of water surrounding the bomb is exactly 2250 g.) kJ/°C
The enthalpy of combustion of benzoic acid (CH-COOH) is commonly used as the standard for calibrating...
The enthalpy of combustion of benzoic acid (CH-COOH) is commonly used as the standard for calibrating constant-volume bomb calorimeters, its value has been accurately determined to be -3226.7 kJ mol! (a) When 0.9862 g of benzoic acid was oxidized, the temperature rose from 21.84°C to 25.67°C. What is the heat capacity of the calorimeter? (b) In a separate experiment, 0.4654 g of glucose (C6H120) was oxidized in the same calorimeter, and the temperature rose from 21.22°C to 22.28°C. Calculate the...
Enter your answer in the provided box. The enthalpy of combustion of benzoic acid (CH COOH)...
Enter your answer in the provided box. The enthalpy of combustion of benzoic acid (CH COOH) is commonly used as the standard for calibrating constant-volume bomb calorimeters; its value has been accurately determined to be -3226.7 kJ/mol. When 3.0653 g of benzoic acid are burned in a calorimeter, the temperature rises from 21.84°C to 24.67°C. What is the heat capacity of the bomb? (Assume that the quantity of water surrounding the bomb is exactly 2250 g.) kJ/°C
A 1.9862-g sample of benzoic acid burns in an excess of oxygen, in a bomb calorimeter. The temperature of the calorimet...
A 1.9862-g sample of benzoic acid burns in an excess of oxygen, in a bomb calorimeter. The temperature of the calorimeter rises from 24.94 C to 28.77 C. The calorimeter contains 2000.0 g of H2O, and the heat capacity of the calorimeter (excluding the water, but including the bomb, thermometer, and all mechanical parts) has the value C(cal) = 5.35 kJ/C. Use the given information to find the molar heat of combustion of benzoic acid (M(benzoic acid) = 122.1 g/mol).
Under constant-volume conditions the heat of combustion of benzoic acid (C6H5COOH) is 26.38 kJ/g. A 2.790...
Under constant-volume conditions the heat of combustion of benzoic acid (C6H5COOH) is 26.38 kJ/g. A 2.790 −g sample of benzoic acid is burned in a bomb calorimeter. The temperature of the calorimeter increases from 21.60 ∘C to 29.95 ∘C. A. What is the total heat capacity of the calorimeter? B. A 1.460 −g sample of a new organic substance is combusted in the same calorimeter. The temperature of the calorimeter increases from 22.14 ∘C to 27.09 ∘C. What is the...
The heat of combustion of benzoic acid, C&H$CO2H is -32.22 kJ/g. You place 2.85 g of...
The heat of combustion of benzoic acid, C&H$CO2H is -32.22 kJ/g. You place 2.85 g of it into a bomb calorimeter and combust the solid, forming carbon dioxide gas and liquid water. How many kJ of energy are released (assume a 100 % yield)? The calorimeter changes in temperature from 19.50°C to 22.70°C. What is the heat capacity of the calorimeter? 3.2C
Benzoic acid, C7H6O2, occurs naturally in many berries. A 1.50-g sample of benzoic acid is combusted in a bomb calorimet...
Benzoic acid, C7H6O2, occurs naturally in many berries. A 1.50-g sample of benzoic acid is combusted in a bomb calorimeter. The temperature of the calorimeter increases from 22.50 0C to 31.69 0C. The calorimeter contains 775 g water and has a heat capacity of 893 J/0C. Based on this information, how much energy (in kJ) is released when you metabolize 1.50 g of benzoic acid? The specific heat capacity of water is 4.184 J/(g⋅0C).
Bomb calorimetry is a technique used to determine the enthalpy of combustion, usually in O2, of a chemical species. A known amount of compound is placed inside a fixed volume container that is, in turn, filled with oxygen at a high enough pressure to ensure complete combustion. The fixed-volume container (the 'bomb') is then inserted into a bucket containing a precisely known volume of water. The oxygen and compound are ignited, and the temperature change in the water is recorded....
(1) (3 points ) A 1.21 g sample of benzoic acid, C7H602, is combusted in a bomb calorimeter in an oxygen rich environment. The calorimeter has a heat capacity of 1365 J/°C, and additionally contains 1.30 kg of water surrounding the bomb. The heat of combustion for benzoic acid is AH° = -3227 kJ per mole of benzoic acid. The initial temperature of the calorimeter and water is 22.5 °C. a. (1 point) What is the balanced chemical reaction that...
Benzoic acid is used to determine the heat capacity of bomb calorimeters because it can be obtained in pure form and its enthalpy of combustion is known very accurately (-26.43 KJ/g). Determine the heat capacity of a calorimeter that had a temperature increase of 7.250°C when 2.500 g of benzoic acid was used. Select one: a.-9.114 kJ/°C b.-18.23 kJ°C c. 18.23 kJ°C d. 4.557 kJ/°C e. 9.114 kJ°C
The enthalpy of combustion of benzoic acid ( CH2COOH) is commonly used as the standard for calibrating constant-volume bomb calorimeters; its value has been accurately determined to be -3226.7 kJ/mol. When 3.2157 g of benzoic acid are burned in a calorimeter, the temperature rises from 21.84°C to 24.67°C. What is the heat capacity of the bomb? (Assume that the quantity of water surrounding the bomb is exactly 2250 g.) kJ/°C
The enthalpy of combustion of benzoic acid (CH-COOH) is commonly used as the standard for calibrating constant-volume bomb calorimeters, its value has been accurately determined to be -3226.7 kJ mol! (a) When 0.9862 g of benzoic acid was oxidized, the temperature rose from 21.84°C to 25.67°C. What is the heat capacity of the calorimeter? (b) In a separate experiment, 0.4654 g of glucose (C6H120) was oxidized in the same calorimeter, and the temperature rose from 21.22°C to 22.28°C. Calculate the...
Enter your answer in the provided box. The enthalpy of combustion of benzoic acid (CH COOH) is commonly used as the standard for calibrating constant-volume bomb calorimeters; its value has been accurately determined to be -3226.7 kJ/mol. When 3.0653 g of benzoic acid are burned in a calorimeter, the temperature rises from 21.84°C to 24.67°C. What is the heat capacity of the bomb? (Assume that the quantity of water surrounding the bomb is exactly 2250 g.) kJ/°C
The heat of combustion of benzoic acid, C&H$CO2H is -32.22 kJ/g. You place 2.85 g of it into a bomb calorimeter and combust the solid, forming carbon dioxide gas and liquid water. How many kJ of energy are released (assume a 100 % yield)? The calorimeter changes in temperature from 19.50°C to 22.70°C. What is the heat capacity of the calorimeter? 3.2C
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