what is the significance of partial molar enthalpy of mixing? I tried to search the net but I did not get anything. I also tried to look at our textbook, which by the way, is by Peter Atkins but I find it insufficient. Please help me...

Do a Google search using as your search phrase:

partial molar enthalpy of solutions. The very first result will be a PDF file that will addresses your topic. I hope you are familiar with partial derivatives and the laws of thermodynamics sufficiently to understand this file. My search turned out quite a few other references that are even more advanced mathematically. It is difficult to impossible to define "partial molar enthalpy" non-mathematically. If DrBob or one of the other tutors can give you a "down to earth" answer I would welcome it.

waht is their impact polyethlyene on human?

The partial molar enthalpy of mixing is a thermodynamic concept used to understand the role of enthalpy in the process of mixing two or more substances. It represents the change in enthalpy when a small amount of a component is added to a mixture while keeping the temperature and pressure constant.

To understand the significance of partial molar enthalpy of mixing, let's consider an example of mixing two ideal gases. Each gas molecule has an individual enthalpy associated with it, which is due to factors such as intermolecular forces and bonding. When the two gases are mixed together, the intermolecular interactions change, leading to changes in the total enthalpy of the mixture.

The partial molar enthalpy of mixing allows us to examine the change in enthalpy as we add small amounts of one component to the mixture. It provides insight into the energy changes associated with mixing and helps us understand the thermodynamic processes occurring at the molecular level. By calculating the partial molar enthalpy, we can determine whether the mixing process is exothermic (releasing heat) or endothermic (absorbing heat).

Unfortunately, if you didn't find satisfactory information on the topic online or in your textbook, there are a few other strategies you can try:

1. Consult additional textbooks or scientific references: Look for resources specifically focused on thermodynamics or physical chemistry. These sources might provide a more detailed explanation of the concept.

2. Academic journals: Search for research articles or review papers on partial molar enthalpy of mixing. These articles often provide comprehensive analysis and discussions on the topic.

3. University or research institute websites: Check the websites of reputable universities or research institutes that have departments or groups specializing in thermodynamics or related fields. They may have educational materials or lecture notes available for public access.

4. Reach out to experts: If you have access to an academic community or a professor in the field, consider reaching out to them for guidance. They may be able to recommend additional resources or provide further explanations.

Remember, when conducting research, it's essential to evaluate the credibility and reliability of the sources you find.