Respuesta :

Answer:

0.2 mol

Explanation:

convert # of moles ----- 0.8 L x 0.5 mol/L = 0.4 mol

equation for decomposition ----- 2HCl-->H2 + Cl2

mole ratio is -----   H2: HCl = 1:2

1/2 x 0.4 mol = 0.2 mol of HCl in HCl solution

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