Enthalpy

Abstract The purpose of this experiment was to evaluate magnesium chloride as a deicer. To be a good deicer, a salt must be able to lower the enthalpy when is mixed with water. This will cause an exothermic reaction and release heat. This experiment had three tests performed within it, The freezing point depression, the enthalpy of dissolution, and finding the calorimeter constant. Even though, the results in this lab had a high present of error it was found that magnesium chloride…

trial, in order to calculate the change in energy (∆U) and the change of enthalpy (∆H). The accepted value for the change in enthalpy of naphthalene is equal to -5157 kJ/mol. The computed value from the experiment is equal to -3076 kJ/mol, which means that the percent error in the experiment is equal to 40.35%. INTRODUCTION In this laboratory report, the method to calculate the change in energy (∆U) and the change in enthalpy (∆H) of a sample can be seen and followed. This method or…

the $2^{nd}$ law efficiency varied from 19.34\% to its first maximum value of 24.05\% at 14:00 hr. The change in enthalpy ($vartriangle$h) and entropy ($vartriangle$S) with respect to time for both the SAHs tested under two different mass-flow rates are calculated and presented in the graphs, cref{fig:Graph-Enthalpy-Jun2} and cref{fig:Graph-Enthalpy-Jun3}. The change in enthalpy helps in understanding the amount of heat energy evolved from the heat exchange process whereas change in entropy…

hydroxide and the y-intercept of the line acts as our enthalpy. Based upon literature values, entropy for calcium hydroxide is 83.4 J/K mol and if entropy is converted to the correct units, this displays a value of 119.3 J/K mol (Thermodynamic quantities for substances and ions at 25˚C). Possible explanations for a greater experimental data value than true value will be discussed the Conclusions section of this report. Based on the literature values, enthalpy for calcium hydroxide is -986.1 KJ/…

QUESTION How does the length of carbon chains, specifically those related to alkanols, namely ethanol 1- propanol and 1- butanol, affect the heat of combustion? AIM To investigate how the length of carbon chains affect the heat of combustion and enthalpy, in order to determine which fuel would be the safest and most efficient to take on a camping trip. HYPOTHESIS If the number of carbon atoms in an alkanol is increased, then the alkanol containing the longest carbon chain will have a higher…

remain constant or Ksp; which stands for the equilibrium concentration for the solubility product. The solubility of a compound changes with temperature, so Ksp changes too. Thermodynamics focuses on three large areas; which are enthalpy, entropy, and free energy. Enthalpy change or ΔH, for KNO3 dissolving…

The alcohol Ethanol a chemical compound that is made up of hydrogen, carbon and oxygen and is produced by a fermentation process, this means that this type of alcohol is renewable, although there are non-renewable ways in which to produce this type of alcohol. This alcohol is often mixed into materials such as gasoline, this helps to allow it to be used as a fuel, and help preserve non-renewable materials that could be put to use in more important ways. The mixture of this is often only at a…

pyro-oxidation zone. (Barman, Ghosh, and De) also considered the formation of tar and methane reforming reaction in the pyro-Oxidation zone. The adiabatic reaction temperature is found out by considering heat balance in the zone. Enthalpy of reactants + Heat loss=Enthalpy of products = The heat loss from the oxidation zone was found to be around 10% by Chern(cite). TO is the temperature of biomass fed to the gasifier and Ta is the temperature of air fed to gasifier. Solving the…

Surface and center temperature of the mushroom, ambient humidity and temperature of vacuum chamber have been measured and recorded by the data logger inside the vacuum chamber (see Fig. 1). On the other hand, the control unit that records the pressure data is located outside the vacuum chamber (see Fig. 1). The measured data saved for each 10 seconds. Before starting the cooling, vacuum pump runs half an hour for stabilizing the system. Experiments carried out for three replicates and the…

Summary: This lab involves three separate experiments. Before you conduct any of them, however, you should put on goggles and aprons, as well as gloves. For the first part, place the FeCl3 solution into the watch glass, and add a few drops of KSCN. Record any changes you might see. Then, ask Dr. Karraker to add a KSCN crystal to the watch glass, and again record any changes. Add drops of Na3PO3 and record any changes, then add FeCl3 and record those changes too. After you are done, dump the…