Four gases were combined in a glass cylinder with these partial pressures:3.5 atm N2,2.8 atm ,0.25 atm At and 0.15 atm He. What is the mole fraction in the mixture? What is the mole fraction of Ar in the mixture?

Which sentence best describes the formation of igneous rock? a- lava on the surface dries up and makes arock b_melted rocks cools and forms crystals c_rocks under tremendous heat and pressure d_magma is melted rock underground

What does the process of natural selection involve

Predict whether the changes in enthalpy, entropy, and free energy will be positive or negative for the boiling of water, and explain your predictions. how does temperature affect the spontaneity of this process?