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A thermally insolated vessel contains 250 g of water and 100 g of ice in thermal...

A thermally insolated vessel contains 250 g of water and 100 g of ice in thermal equilibrium at normal pressure. Then, a certain amount of hot steam at 140 oC is added. After waiting for a long enough time, the temperature inside the vessel is settled at 50 oC. How much steam was injected?

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