-calculez masa molara di densitatea relativa,stiin M,aer= 29g/mol
d= M,/M,aer---->
3,9- =M/29------>M=113,1g/mol
100g compus.....31,9gC.....5,3gH.....62,89gCl
131,1..................m= 36g......m=6g.......m=71g
deduc molii de atomi
nC= 36g/12g/mol= 3
nH= 6g/1g/mol= 6
nCl= 71g/35,5g/mol= 2
formula moleculara este :C3H6Cl2