No it doesn’t change in size and shape but the mass does change.
Hope this helps some
"In chemistry and physics, atomic theory is a scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms. ... In fact, in certain extreme environments, such as neutron stars, extreme temperature and pressure prevents atoms from existing at all."
PV=nRT n=PV/RT
R=.0821 atm x L
Mol x K
T=318K
P=.55atm
V=37.4L
n= (.55atm) (37.4L) /
.0821atm x L (318k)
mol x K
n= .79 mol of sulfur dioxide
