Which of the following describes what occurs as a solid becomes a liquid?
a) chemical change occurs; the particles of the solid vibrate more slowly and their kinetic energy decreases.
b) chemical change occurs; the particles of the solid vibrate faster and their kinetic energy increases.
c) physical change occurs; the particles of the solid vibrate more slowly and their kinetic energy decreases.
d) physical change occurs; the particles of the solid vibrate faster and their kinetic energy increases.

samuel de champlain. in 1608, king henry iv sponsored pierre dugua, sieur de mons and samuel de champlain as founders of the city of quebec with 28 men. this was the second permanent french settlement in the colony of canada.

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.