on ignition converts into . A sample of pyrolusite having , inert impurities and the rest water is heated in air to constant weight. What is the % of Mn in ignited sample? (At. mass of Mn )

Question

on ignition converts into . A sample of pyrolusite having  ,  inert impurities and the rest water is heated in air to constant weight. What is the % of Mn in ignited sample? (At. mass of Mn )

Canvas Classes · Accepted Answer

Strategy:
 Track the element Mn through the reaction. Ignition converts the sample's  to , while impurities remain unchanged. The mass of Manganese itself is conserved; only the total sample mass changes due to Oxygen loss.

Step 1: Calculate mass of Mn in a 100g sample
 mass .
Impurities mass .
 sample has  of Mn.

Step 2: Calculate new residue mass after oxygen loss
The Manganese () now exists as .
Mass of .
Total residue .

Step 3: Calculate percentage
 
(Note: Re-checking question specific v

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