Question

30.0-g of water is put into an iron container whose mass is 125 g. After the system comes into thermal equilibrium, only some of the water is evaporated. The amount of energy required to bring the water up to 100^o C is 370. cal. Once the water has reached 100^0 C, the amount of energy left (from the iron) to evaporate the water is 1,390 cal. What is the final equilibrium temperature of the system?

Answer 1

As it is ckear from the question that only some of the water was evaporated by hot iron. So iron eventuaally cool.down to 100 when it nonloger can provide with more heat to evaporate more water. Si final temp of system is 100° C

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