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Steam initially at 100° C is mixed with 150 g of ice at -60.0° C, in...

Steam initially at 100° C is mixed with 150 g of ice at -60.0° C, in a thermally insulated container. When the system comes to thermal equilibrium, everything inside the container has been converted into liquid water at 50° C. What is the entropy change of the steam during the process? please show each step.

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