Bomb Calorimeter
Abstract
The aim of this experiment is to determine the heat of combustion for naphthalene. This is the some basic bomb procedures. In this experiment, we us naphthalene as a fuel in bomb calorimeter which naphthalene powder is turned to pellet using pellet press. The fuel is burnt at constant volume condition in a high pressure container (the bomb). The whole bomb, pressurized with excess of oxygen. The mass of iron wire, ma =0.02g. The mass of naphthalene pellet with iron wire, mb =0.38g. The bomb is submerged in 850g of water and the initial temperature of calorimeter state temperature of calorimeter water before burning the fuel, Ti is recorded and also steady state temperature of calorimeter water after burning the fuel, Tf. Water equivalent (effective heat capacity) of the calorimeter is calculated using the following heat balance equation: mn cn=W x cw x ∆T. Objective
To determine the water equivalent of the bomb calorimeter using naphthalene.
Introduction
Bomb calorimeter is an apparatus in which a small quantity of a fuel is burnt at constant volume condition in a high-pressure container (the bomb). High-pressure oxygen is admitted into the bomb so that the fuel burns completely. The bomb dips in a calorimeter filled with water. When the fuel burns, heat is released. Apart from the water, the calorimeter also absorbs heat from the burning. The temperature rise of the water is therefore not accurate if it is used to determine the amount of heat released due to the burning. In order to overcome this problem, we must determine how much heat is absorbed by the calorimeter, using a standard fuel where its calorific value is known. In this experiment, the fuel is naphthalene. We express this value in terms of the water equivalent of the calorimeter, which means that the heat absorbed by the calorimeter is equivalent to an amount of water absorbing the same amount of heat. Therefore, the objective of this experiment is to determine the amount of
The aim of this experiment is to determine the heat of combustion for naphthalene. This is the some basic bomb procedures. In this experiment, we us naphthalene as a fuel in bomb calorimeter which naphthalene powder is turned to pellet using pellet press. The fuel is burnt at constant volume condition in a high pressure container (the bomb). The whole bomb, pressurized with excess of oxygen. The mass of iron wire, ma =0.02g. The mass of naphthalene pellet with iron wire, mb =0.38g. The bomb is submerged in 850g of water and the initial temperature of calorimeter state temperature of calorimeter water before burning the fuel, Ti is recorded and also steady state temperature of calorimeter water after burning the fuel, Tf. Water equivalent (effective heat capacity) of the calorimeter is calculated using the following heat balance equation: mn cn=W x cw x ∆T. Objective
To determine the water equivalent of the bomb calorimeter using naphthalene.
Introduction
Bomb calorimeter is an apparatus in which a small quantity of a fuel is burnt at constant volume condition in a high-pressure container (the bomb). High-pressure oxygen is admitted into the bomb so that the fuel burns completely. The bomb dips in a calorimeter filled with water. When the fuel burns, heat is released. Apart from the water, the calorimeter also absorbs heat from the burning. The temperature rise of the water is therefore not accurate if it is used to determine the amount of heat released due to the burning. In order to overcome this problem, we must determine how much heat is absorbed by the calorimeter, using a standard fuel where its calorific value is known. In this experiment, the fuel is naphthalene. We express this value in terms of the water equivalent of the calorimeter, which means that the heat absorbed by the calorimeter is equivalent to an amount of water absorbing the same amount of heat. Therefore, the objective of this experiment is to determine the amount of