An aluminum calorimeter with a mass of 100 g contains 250 g of water. The calorimeter and water are in thermal equilibrium at 10.0°C. Two metallic blocks are placed into the water. One is a 100.0-9 piece of copper at 50.0°C. The other has a mass of 70.0 g and is originally at a temperature of 100°C. The entire system stabilizes at a final temperature of 20.0°C. Specific Heat (J/kg. °C) Specific Heats of Some Substances at 25°C and Atmospheric Pressure Specific Heat Substance J/kg. °C) Substance Elemental solids Other solids Aluminum 900 Brass Beryllium 1 830 Glass Cadmium 230 Ice (-5°C) Copper 387 Marble Germanium 322 Wood Gold 129 Iron Liquids 448 Lead 128 Alcohol (ethyl) Silicon 703 Mercury Silver 234 Water (15°C) Gas Steam (100°C) Note: To convert values to units of cal/g °C, divide by 4 186. 380 837 2 090 860 1 700 2 400 140 4 186 2010 (a) Determine the specific heat of the unknown sample. J/kg . °C (b) Using the data in the table above, can you make a positive identification of the unknown material? O Yes O No Can you identify a possible material? O Yes O No (c) Explain your answers for part (b).