(Solved): Consider a solution of acetonitrile (molar mass \( 41 \mathrm{~g} \) ) in water (molar mass \( 18 ...

Consider a solution of acetonitrile (molar mass \( 41 \mathrm{~g} \) ) in water (molar mass \( 18 \mathrm{~g} \) ). Which statement about the kinetic energy of these molecules is correct? (Hint: Consider that the typical speed of a molecule decreases with increasing mass, but that the kinetic energy increases with mass.) The lighter molecule (water) has a larger kinetic energy on average. The heavier molecule (acetonitrile) has a larger kinetic energy on average. Both molecules have the same kinetic energy on average.