i was reading something today about. Mercurous Chloride(Hg2Cl2) turning in to Mercuric Chloride(HgCl2)when exposed to sunlight. if so would't it bee easeier to make Mercurous Chloride as discribed at?

https://www.thevespiary.org/rhodium/Rhodium/chemistry/mercurychloride.html

then leave it out in sunlight to convert to Mercuric Chloride(HgCl2) rather then going the HgSO4 route? and if so how much sun light would covert a few grams of Mercurous Chloride?

i prefer handling liquids and solids over handling gasses...

how much indeed?  im not a physical chemist.. but id suggest that assuming that this is possible (ie what happens to the other hg?)... it'd be pretty hard to tell if/when the reaction proceeds... my advice it to come up with a better way...

Direct from solid to gaseous state. Mercury sublimes easily. This is no good idea for your health I believe (but a realy mean idea for murdering someone - but who wants to do this).
So you better store your Hg2Cl2 well closed and avoid spilling it.

HgI is easier anyways.