A mixture containg `As_(2)O_(3)` and `As_(2)O_(5)` and required `20.10mL` of `0.05N` iodine for titration. The resulting solution is then acidified and excess fo `KI` was added. The liberated iondine required `1.1113g` hypo `(Na_(2)S_(2)O_(3) 5H_(2)O)` for complete reaction. Calculate mass of mixture. The reactions are:
`AsO_(3) + 3l_(2) + 2H_(2)O rarr As_(2)O_(5) + 4H^(+) + 4I^(-)`
`As_(2) O_(5) + 4H^(+) + 4l^(-) rarr As_(2) O_(3) + 2l_(2) + 2H_(2)O`

Answer

`0.2496g`