A 2.0 g sample containing is treated with HCl liberating . The gas is passed into a solution of KI and 60.0 mL of is required to titrate the liberated iodine. The percentage of in the sample is .

Question

A 2.0 g sample containing  is treated with HCl liberating . The  gas is passed into a solution of KI and 60.0 mL of  is required to titrate the liberated iodine. The percentage of  in the sample is . (Nearest integer)

[Atomic masses (in u): ; ; ; ; ; ; ]

Canvas Classes · Accepted Answer

Step 1 — Chain of reactions:

(i)

(ii)

(iii)

Step 2 — Moles of :

Step 3 — Moles of  (from iii, ratio 1:2):

Step 4 — Moles of  (from ii, ratio 1:1):

Step 5 — Moles of  (from i, ratio 1:1):

Step 6 — Mass of :

Step 7 — Percentage:

Answer: 13%

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