Answer:
Formula/Molecular Mass = 147.77415g/mol = 148g/mol (to 3 significant figures)
Step-by-step explanation:
Given the Law of the Conservation of Mass, the amount of H2O produced will be equal to 10.00g-4.40g = 5.6g
Given equation n=m/M ,
n(H2O)= 5.6/ (1.008×2)+(15.999) = 0.318520677 moles
∴ x=0.318520677 moles
∴ Molecular mass (hydrated sodium sulfate) =
= (22.990×2)+(32.06)+(15.999×4)+[0.318...((1.008×2)+(15.999))]
= 147.77415g/mol