Coffee Cup Calorimeter Equation
The coffee cup calorimeter cant be used for high-temperature reactions either because they would melt the cup.
Coffee cup calorimeter equation. A coffee cup calorimeter is great for measuring heat flow in a solution but it cant be used for reactions that involve gases since they would escape from the cup. A coffee cup calorimeter is a constant pressure calorimeter. The absolute enthalpy of a system H cannot be measured directly.
One kind of calorimeter known as a coffee cup calorimeter is shown at left. Coffee cup calorimeters are usually used to measure changes that take place in solution. In the laboratory we often use a simple device that is called the coffee cup calorimeter.
Here the calorimeter as in the Q calorimeter term is considered to be the water in the coffee cup. 100 grams of ice at 00 o C is added to a coffee-cup-calorimeter containing 1000 grams of water at 300 o C. The heat capacity of the apparatus is 100 JK.
Since the mass of this water and its temperature change are known the value of Q calorimeter can be determined. Coffee cup calorimeter is usually filled with water and used as a common calorimeter. Instead of bomb a styrofoam cup is used in this calorimeter.
Q calorimeter mCDT Q calorimeter 1000 g418 JgC181C - 354C Q calorimeter -72314 J. Another common heat unit is the calorie cal. That is the system is the reaction.
A simple calorimeter can be constructed from two polystyrene cups. Coffee cup calorimeter A styrofoam cup with an inserted thermometer can be used as a calorimeter in order to measure the change in enthalpyheat of reaction at constant pressure. A student wishes to determine the heat capacity of a coffee-cup calorimeter.