In chemistry, it is important to know the volume and density of gases. It can be difficult to calculate these values if you’ve never done it before. However, with a little bit of math, you will be able to do this calculation on your own! In order for gas molecules in an area at pressure P and temperature T to have a uniform distribution throughout that area, the number of molecules must equal N = RT/P where R is the universal gas constant (R=8.3145 J/(mol·K) ) and T is the absolute temperature in Kelvin. With 2 mol of gas at 30∘C and 1.5atm., we can find our volume V by multiplying)]edubc-)(cm/(g [ensityD ).edubc(-^cm 97 or,³)sub(^ m06149700. 0)=C∘273+C∘30T/(*]K·mol[)/³)sub(^ m2107.0 ( *02. 0 =]³)sub(^m [Volume ! below shown are values resultingThe .ers lit in volume represents V and mole per kilograms in weight molecular represents M whereV/M= D: formula a through ρ density our find then canWe . provided chart the on found is that) meters cubicin ( V volume the by N molecules of number the to need you because gases forities dens and volumes calculating tricky be can it that remember to importants’It ! gas of grams 18 about contains liter each means This.liter/g 18 orliter/kg018. 0 equals D that get we equations the into plugged values these With).olem/erslit (ers lit in Volume for value calculated our being V withT),)(P/( R to equal is which, respectively, volume unit per molecules of number the are M and N where)V()/M)(N=(D : equation this using calculated is D densityThe L 200 =ityolarm/L 100 xmol02.0=V . volume the byoles m of number the C ∘m at −G K – cm -mol∙g : instead coefficient numerical a has it that so equation this rewrite to going are we,ers lit or kilograms than grams with work to easier’s itSince ).L−mat-mol∙ g get to multiplied be will parentheses in value the then, mole a of measure your as unit mass atomic an have you if that find canWe 16.0-^T))+273T/(()*R/P ( *)V/N=(D T: and R for equation our of sides both dividing by calculated is D densityThe L*02. 0= V or, volume the witholes m of number the