A 1.0 mol sample of He(g) at 25°C is mixed with a 1.0 mol sample of Xe(g) at 50°C. Which of the following correctly predicts the changes in average kinetic energy and the average speed of the Xe(g) atoms that will occur as the mixture approaches thermal equilibrium? Average Speed of Xe Atoms Average Kinetic Energy of Xe Atoms
(A) Will increase Will increase
(B) Will increase Will decrease
(C) Will decrease Will increase
(D) Will decrease Will decrease

option D.

Both the average kinetic energy and the average speed of the Xe(g) atoms that will occur as the mixture approaches thermal equilibrium will decrease.

Explanation:

Kinetic Energy is simply said to be the energy of motion, that is when an object moved from one position to another the energy that it gains is called the kinetic energy. It is represented mathematically by 1/2mv². Where m is the mass of the object and v is the velocity of the object.

The average Kinetic energy is the average of all kinetic energies of a particle. The average Kinetic energy is represented mathematically by 3/2RT.  

The temperature of Xe which is at 50°C is greater that the temperature of He which is at  at 25°C will decrease when it reaches equilibrium after mixing. Hence,  the average kinetic energy and the average speed of the Xe(g) atoms that will occur as the mixture approaches thermal equilibrium will decrease.

THE GUILDING PRINCIPLE: We have that the average speed and KE decreases with temperature and vice versa for real gases.

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.