What is the molecular formula for a compound that has the empirical formula of hgcl and a molar mass of 472.2g/mol?

This problem is quite easy once you start thinking about it.

If the empirical formula is HgCl (which has a molar mass of 271.5 g/mol)

And the molar mass of the molecular compound is 472.2 g/mol, just divide the two numbers. You'll get 1.74. And since this number is a decimal, this question isn't solvable. You've either provided the wrong empirical formula or the wrong molar mass. 

Density and pressure

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