One kilogram of Mercury, forty grams of water, and 200grams of acetic acid are all mixed together and come to equilibrium at a common unknown temperature. The Mercury starts at 80 degrees F, the water starts at 85 degrees F, and the acetic acid starts at 90 degrees F. What is the final equilibrium temperature of the mixture in degrees Fahrenheit? The following table of material properties might be useful:

Material Density (kg/m') Specific Heat (J/ (kg K)) Aluminum 2700 900 Copper 8790 385 Gold 19290 129 Ice (H2 0) 917 2090 Stainless steel 7750 502 Acetic acid 1049 2040 Ethyl alcohol 789 2400 Mercury 13590 140 Water 1000 4184 Platinum 21500 133