Calculate the weight of lime (CaO) obtained by heating 270kg of 90% pure lime stone (`CaCO_3`).
`CaCO_3​→CaO+CO_2` ​

Explanation

To calculate the weight of lime (CaO) obtained by heating 270 kg of 90% pure limestone (CaCO₃), we can follow these steps:

### Step 1: Calculate the amount of pure limestone (CaCO₃)
Given that the limestone is 90% pure, we can calculate the amount of pure CaCO₃ in 270 kg of limestone.

\[ \text{Amount of pure CaCO}_3 = \frac{90}{100} \times 270 \, \text{kg} = 243 \, \text{kg} \]
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