'A scientist in a local university has just proposed a new temperature scale called the Xanthine...

 

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'A scientist in a local university has just proposed a new temperature scale called the Xanthine temperature scale. On the Xanthine scale, water boils at -15.0 X and freezes at -80 X. Determine the temperature of 300 K on the Xanthine scale. (5) Estimate the minimum amount of energy, in kJ, required to completely melt 250 g of nickel at room temperature. At sea level, the temperature and pressure of a weather balloon is 30C and 100kPa, respectively. As the balloon reaches a certain height, the pressure decreases to 90 kPa. What is the temperature at this height? State any assumption that you need to make to solve this problem. (6) (5) 'A scientist in a local university has just proposed a new temperature scale called the Xanthine temperature scale. On the Xanthine scale, water boils at -15.0 X and freezes at -80 X. Determine the temperature of 300 K on the Xanthine scale. (5) Estimate the minimum amount of energy, in kJ, required to completely melt 250 g of nickel at room temperature. At sea level, the temperature and pressure of a weather balloon is 30C and 100kPa, respectively. As the balloon reaches a certain height, the pressure decreases to 90 kPa. What is the temperature at this height? State any assumption that you need to make to solve this problem. (6) (5)