All of the following are principles of the cell theory except (a)all living things are made of one or more cells (b)the cell is the smallest unit of life (c) water is the main ingredient in every cell (d) all new cells come from preexisting cells explain why

c, not everything is made up of water. like oxygen, its made up of oxygen not water

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.