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First Practice 160

# First Practice 160 - 1 Consider a heating curve for a...

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1. Consider a heating curve for a sample of water. Assume that heat is added to the sample at a constant rate. The specific heat capacity of ice is 2.09 J/g°C. The heat of fusion of ice is 6.02 kJ/mol. X. What is the slope of the heating curve’s portion that corresponds to warming 25.0 grams of ice? Y. What is the slope of the heating curve’s portion that corresponds to melting 25.0 grams of ice? X Y A. 0 8.35 kJ/°C B. 0 0.120 °C/kJ C. 0.0191°C/J 8.35 kJ/°C D. 52.3 J/°C 0.120 °C/kJ E. 52.3 J/°C 8.35 kJ/°C F. 0.0191°C/J 0.120 °C/kJ G. 0.0191°C/J 0 H. 52.3 J/°C 0 2. The normal sublimation point of dry ice, CO 2 (s), is –78.5 o C. The enthalpy or heat of sublimation of carbon dioxide is 26.2 kJ/mol. Calculate the vapor pressure of CO 2 (s) at –63.0 o C. 3. For which of the following choices is the solute considered to be soluble in the solvent? Solute Solvent X. I 2 C 6 H 6 (benzene) Y. KCl CCl 4 Z. CH 3 OH H 2 O 4. A new element with molar mass 262 g/mol is found to crystallize with a body-centered unit cell. If its density is 4.62 g/cm 3 , what is its atomic radius?

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