Find the mass of water that vaporizes when 3.94 kg of mercury at 248 °C is added to 0.183 kg of water at 83.0 °C.
My Lord: think of the spattering Hg going all over the room. Yes, it is a toxic substance.
HeatgainedbyHg+Heatgainedby water+heatinSteam=0
3.94kg*specheatHg)(100-248)+.183kg*specheatH2O(100-83)+masswater(Hv)=0
solve for mass water, knowing the specific heats, and heat of vaporizaton of water.
If mass steam is negative, then none is converted to steam, and the final temp is not 100C