Please calculate the correct answer of the following question

Question- An ingot of solid copper with a mass of 1 kg and an average heat capacity of 0.39 J/g K is at a temperature of 500.00 °C. If the ingot is quenched in a water bath initially at 25.00 °C:

Part 1- What mass of water at 25.00 °C must be used so that the final state of the system consists of liquid water, steam, and solid copper at 100 °C, half the water having been converted to steam. The heat capacity of water (4.184 J/g K) can be considered constant over the temperature range and the heat of vaporization of water is 2257 J/g at 100.00 °C.

Part 2- What is ΔS of the copper-water system in this transformation?

I need assist to evaluate the mass of water.