The X element in the compound = titanium
The chlorine has the molecular weight = 35.5 g/mol
In the compound of Xcl4 , there are four atoms of chlorine molecules who occupy 0.75 of total weight.
The weight of all 4 chlorine atoms = 4×35 = 140 g/mol
Now the total weight of the all chlorine atoms in the compound = 140/0.75
Now the total weight of the compound = 186.66≈ 187
The weight of X element = 187 - 140 = 47 g /mol
if we match any element from the periodic table , so can find that the titanium has the molecular weight roughly equal to 47.
So The compound is TiCl4 whose molecular weight is 140 g/mol.
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