Question

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Answer 1

The mass of Ba(CIO₃)₂ : 121.72 g

Further explanation

Reaction

Ba(OH)₂ + 2HCIO₃ ----> Ba(CIO₃)₂ + 2H₂O

Limiting reactant :

Ba(OH)₂ : 2HCIO₃ =

$\tt \dfrac{0.5}{1}\div \dfrac{0.8}{2}=0.5\div 0.4\rightarrow HClO_3~limiting(smaller~ratio)$

mol Ba(CIO₃)₂ based on limiting reactant(HCIO₃) :

$\tt \dfrac{1}{2}\times 0.8=0.4$

MW Ba(CIO₃)₂ =Ba+2.Cl+6.O=137.3 + 2 x 35.5 + 6 x 16 = 304.3

mass of Ba(CIO₃)₂ :

$\tt mass=mol\times MW\\\\mass=0.4\times 304.3=121.72~g$