Question

Calculate the formula mass of potassium sulfite dihydrate, K2SO3⋅2H2O
, in atomic mass units (amu or u).

Answer 1

Answer: 194.2902 amu

Solution:

$M(K2SO3⋅2H2O)=2M(K)+M(S)+4M(H)+5M(O)$

$M(K2SO3⋅2H2O)=2×39.0983+32.065+4×1.0079+5×15.9994=194.2902‬$