A calorimeter containes 50g of water at ...

A calorimeter containes `50g` of water at `50^(@)C` . The temperature falls to `45^(@)C` in `10` minutes. When the calorimeter contains `100g` of water at `50^(@)C` it takes `18` minutes for the temperature to become `45^(@)C` . Find the water equivalent of the calorimeter.

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The correct Answer is:

12.5g

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