A mixture of iron (II) and lead (II) caerbonates was calcined. As a result of thisk, an amount of 0.9 " mol of "`CO_(2)` was evolved. The mixture of metal oxides obtained by decomposing the above carbonates was treated with sulphuric acid, which, resulted in a mass of 151.6 g of a sulphate as precipitate. Determine the composition of the starting mixture of carbonates in mass percentage.

Explanation

To determine the composition of the starting mixture of iron (II) and lead (II) carbonates in mass percentage, we can follow these steps:

### Step 1: Write the Decomposition Reactions
The decomposition of iron (II) carbonate (FeCO₃) and lead (II) carbonate (PbCO₃) can be represented as follows:
- For iron (II) carbonate:
\[ \text{FeCO}_3 \rightarrow \text{FeO} + \text{CO}_2 \]
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