Answer:
355 grams
Step-by-step explanation:
mol=m/molar mass
molar mass of sodium sulfate=142 g/mol
if you want to know how to calculate this just look up a periodic table and mm should equal 2×mass of sodium+sulphur mass+4×oxygen mass.
this is because the formula is Na2SO4
therefore 2.5=m/142
=355 grams