Calorimeter calibration

A 100.0 g sample of glycerol is put into the calorimeter calibrated in Problem 6, and its temperature is observed to be 20.5°C. Then 45.7 g of iron at 165.0°C are added to the glycerol, giving a resultant temperature of 37.4°C. Calculate the specific heat of the glycerol. (Use the approximate specific heat of iron.)... 

Calculate the following quantities, using the calorimeter calibrated in Problem 8. 

The thermal behavior of pantoprazole sodium was examined by DSC, using a TA Instrument model 91 OS differential scanning calorimeter calibrated with indium. Pantoprazole sodium samples ranging from 5 to 10 mg were run at a heating rate of 5°C/min over a temperature range of 50°C to 179°C. 

Dry the Styrofoam cups used for the calorimeter calibration. Reassemble the apparatus as in Fig. 11.1. 

A 100 -g sample of food is placed in a bomb calorimeter calibrated at 7.23 kJ/°C. When the food is burned, the calorimeter gains 512 kj of heat. If the initial temperature of the calorimeter was 19°C, what is the final temperature of the calorimeter and its contents ... 

A continuously operating mechanical stirrer ensured quick mixing of material inside the calorimeter. Similar to the location of the thermistor, a calibrating resistance coil protected with glass was kept inside the calorimeter for measuring the water equivalent of the calorimeter. Calibrated current was passed for specified time and the temperature rise was monitored for calculating the water equivalent. 

A, B, and C Gas compositions selected by IGT for the forthcoming new calorimeter calibration standards. 

Rangeabihtv. For this test, gas chromatographs A, B, and C, and a calorimeter were compared to the laboratory GC at different heating value levels. The calorimeter was calibrated using the standard calorimeter calibration gas from IGT. 

The experiments were performed in a graphite crucible and the calorimeter calibration was obtained with samples of platinum. 

With most non-isothemial calorimeters, it is necessary to relate the temperature rise to the quantity of energy released in the process by determining the calorimeter constant, which is the amount of energy required to increase the temperature of the calorimeter by one degree. This value can be detemiined by electrical calibration using a resistance heater or by measurements on well-defined reference materials [1], For example, in bomb calorimetry, the calorimeter constant is often detemiined from the temperature rise that occurs when a known mass of a highly pure standard sample of, for example, benzoic acid is burnt in oxygen. 

Experiments were performed in tlie SIMULAR calorimeter using the power compensation method of calorimetry (note that it can also be used in the heat flow mode). In this case, the jacket temperature was held at conditions, which always maintain a temperature difference ( 20°C) below the reactor solution. A calibration heater was used to... 

There are two steps in the calculation. First, calibrate the calorimeter by calculating its heat capacity from the information on the first reaction, Cca) = qc, /AT. Second, use that value of Cc-1 to find the energy change of the neutralization reaction. For the second step, use the same equation rearranged to gcal = Cca AT, but with AT now the change in temperature observed during the reaction. Note that the calorimeter contains the same volume of liquid in both cases. Because dilute aqueous solutions have approximately the same heat capacities as pure water, assume that the heat capacity is the... 

Self-Tfst 6.4B A calorimeter was calibrated by mixing two aqueous solutions together, each of volume 0.100 L. The heat output of the reaction that took place was known to be 4.16 kj, and the temperature of the calorimeter rose by 3.24°C. 

The heat capacity of an object is the ratio of the heat supplied to the temperature rise produced. Heat transfers are measured by using a calibrated calorimeter. 

When 0.113 g of benzene, C6H6, burns in excess oxygen in a calibrated constant-pressure calorimeter with a heat capacity of 551 J-(°C) I, the temperature of the calorimeter rises by 8.60°C. Write the thermochemical equation for... 

A calorimeter was calibrated with an electric heater, which supplied 22.5 kj of energy to the calorimeter and increased the temperature of the calorimeter and its water bath from 22.45°C to 23.97°C. What is the heat capacity of the calorimeter ... 

A calorimeter is calibrated with an electrical heater. Before the heater is turned on, the calorimeter temperature is 23.6 °C. The addition of 2.02 X 10 J of electrical energy from the heater raises the temperature to 27.6 °C. Determine the total heat capacity of this calorimeter. 

C06-0017.A coffee-cup calorimeter is calibrated using a small electrical heater. The addition of 3.45 kJ of electrical energy raises the calorimeter temperature from 21.65 °C to 28.25 °C. Calculate the heat capacity of the calorimeter. 

C06-0068. Constant-volume calorimeters are sometimes calibrated by ranning a combustion reaction of known A E and measuring the change in temperature. For example, the combustion energy of... 

C06-0069. Constant-pressure calorimeters can be calibrated by electrical heating. When a calorimeter... 

Landau et al. (1994) studied the reaction between a cyclic sulphite and sodium cyanide (Fig. 5.4-33) using an RCl calorimeter. All components were loaded into the reactor at ambient temperature. Then the temperature was raised to 90 C at 1.5 C/min. After 15 min at 90°C the temperature was ramped to 100 C at 1.5 C/min. The same procedure was repeated to raise the temperature to 110 °C. The reactor was maintained at that temperature until heat evolution had ceased. Calibrations were performed prior to reaction and after reaction was completed. 

Thermal Properties. The glass transition temperature (Tg) and the decomposition temperature (Td) were measured with a DuPont 910 Differential Scanning Calorimeter (DSC) calibrated with indium. The standard heating rate for all polymers was 10 °C/min. Thermogravimetric analysis (TGA) was performed on a DuPont 951 Thermogravimetric Analyzer at a heating rate of 20 °C/min. 

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