What changes would occur at a molecular level if a liquid is placed in cool conditions?

a. the motion of the molecules would remain the same.
b. the motion of the molecules would increase.
c. the motion of the molecules would decrease.
d. the motion of the molecules would stop.

I believe the answer is option c. The motion of the molecules would decrease.

The motion of molecules would decrease at a molecular level if a liquid is placed in cool conditions.

C. The motion of the molecules would decrease.

Explanation:

For the change in the state of matter in a substance, particle movements are responsible. Thus, an increase in motion means high kinetic energy and vice versa. Also, kinetic energy and temperature are directly proportional to each other.  

When a liquid is placed in colder conditions, the particles in it come closer because the motion among molecules decreases at a molecular level. This leads to low kinetic energy among molecules because the temperature is a measure of kinetic energy.

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm