For this question, consider only the coulomb energy component (the largest) between two atoms. given that nacl (formed from na+ and cl–) has melting temperature of 1074 k (or 801 c), see table 2.3, roughly estimate the melting temperature in kelvin of mgo from that of nacl, i. e., the ratio of coulomb energy. (assume that the equilibrium bond lengths are given by the sum of ionic radii, see table inside front cover of textbook.)

law of conservation of matter

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.