The graph shows a heat curve for an unidentified substance discovered by the Mars rover. 400 380 360 340 320 300 - 280 260 240 220 - 200 180 160 140 - 120 - 100 80 - 60 - 40 20 - -20 - 40 - -60 - -80 40 80 120 Heat (J) What is the temperature of fusion, Tusion, Of the substance? Tfusion 80 °C What is the temperature of vaporization, Tyapor, of the substance? Temperature (°C)

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What amount of thermal energy (in kJ) is required to convert 38.2 g of ethanol at -148 °C completely to gaseous ethanol at 100 °C? The melting point of ethanol is -114 °C and its normal boiling point is 78 °C. The heat of fusion of ethanol is 5.0 kJ mol-1 The heat of vaporization of ethanol at its normal boiling point is 35.0 kJ mol-¹ The specific heat capacity of solid ethanol is 1.05 J g-¹ °C-1 The specific heat capacity of liquid ethanol is 2.44 J g-¹ °C-¹ The specific heat capacity of gaseous ethanol is 1.01 J g-¹ °C-¹ Answer:

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