In which sample do molecules have the greatest average kinetic energy? a.) he at 100 k. b.) h2 at 200 k. c.) o2 at 300 k. d.) h2o at 400 k.

D.) at 400 K.

Explanation:

Kinetic energy is the energy possessed by an object by virtue of its motion.

Average kinetic energy is defined as the average of the kinetic energies of all the particles present in a system. It is determined by the equation:

K= kinetic energy

R= gas constant

T= temperature in Kelvin

From above, it is visible that kinetic energy is directly related to the temperature of the system. So, if temperature is more, average kinetic energy of the system is more.

Thus at 400 K will have greatest average kinetic energy.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer