A piston-cylinder, initially containing 200 mol of helium at 300 K and 0.1 m3 , is expanded to 5 times its original volume by applying 1.5 MJ of heat from a hot reservoir at 400 K. Assuming helium is a van der Waals fluid and with C ∗ P = 29 J/(mol·K), determine the maximum work that can be produced from this process. What is the final temperature of the gas?

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

What is one real world example of a colligative property?