No.
The law of conservation is about not losing any material .. because you start with 27.31g and 19.6mg you have to convert 19.6mg to grams which is 1.96x10^-5g so you have 2.93x10^-6 g to start.. but you’re ending with 46.91g.
It’s a trick question because if you just add 27.31 and 19.6 you get 46.91 but the conversation of the mg to g makes a big difference.. and it does not uphold the law of conservation.