The melting point, boiling point and heat of vaporization of pure copper at 1 atm are 1084 °C, 2562 °C and 300.4 kJ/mol, respectively. Assume that the melting point and the heat of vaporization are both constant. Please calculate (a) the boiling point of pure copper in a vacuum chamber with a pressure of 1 Pa and (b) the vapor pressure at the triple point

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