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A piece of iron is heated to 95.0 C and then placed in an insulated vessel containing 250. g of water at 25.0 C. when

A piece of iron is heated to 95.0 C and then placed in an insulated vessel containing 250. g of water at 25.0 C. when the system comes to equilibrium the temperature of the system is 35.0 C. What is the mass (in g) of the iron? Assume no heat is lost to the surroundings

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