A sample of and weighing is ignited to constant weight. The constant weight obtained is . The percentage of in the sample is

Question

A sample of  and  weighing  is ignited to constant weight. The constant weight obtained is . The percentage of  in the sample is

Canvas Classes · Accepted Answer

Strategy:
 When a mixture of carbonates is heated to "constant weight," it means the carbonates have completely decomposed into their respective oxides. We set up a mass balance equation where the sum of the residue masses ( and ) equals the final constant weight.

Step 1: Write the decomposition reactions

Step 2: Set up the mass balance equation
Let the mass of  be . Then mass of  is .
- Moles of , producing  moles of  (Mass ).
- Moles of , producing  moles of  (Mass ).

Step 3: Solve for x

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