Hydrogen fluoride gas is collected in a vessel and left for some time. Then, a constant molar mass of the sample is experimentally determined as 34 g/mole. This abnormal molar mass is due to dimerization as well as trimerization of some HF molecules. The mole ratio of monomeric and trimeric form of hydrogen fluoride molecules present is 4: 1. If 1/x is the fraction of total molecules present in the final sample as  $H_2{F}_2$  molecules, what is the value of x? (Report the value to nearest integer)
Hint: Initially there are only HF molecules.
Atomic mass of F and H are 19 and 1 respectively.