# ch12_1 - Ch12 Practice Problems#1 Clemens 1 What is the...

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Ch12 Practice Problems #1 Clemens 1. What is the difference between a permanent and nonpermanent gas? 2. A liquid has a heat of vaporization of 29.1kJ/mol and a vapor pressure of 0.703 atm at 25.0 o C. What is its vapor pressure at 95.0 o C? 3. Calcium metal has a density of 1.55g/cm 3 and crystallizes in a cubic unit cell with an edge length of 558.2pm. a. how many Ca atoms are in one unit cell? b. In what unit cell does Ca crystallize?

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Unformatted text preview: 4. Calculate the density of platinum if it crystallizes in the fcc structure with an atomic radius of 139 pm. 5. Determine the atomic radius of tantalum which crystallizes in the bcc structure and has a density of 16.654 g/cm 3 . 6. Please also do #37 from ch. HW 7. Also, review the cubic closest packed and hexagonal closest packed structures. Check out how they form and what type of unit cell they make....
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• Winter '08
• Clemens
• Vaporization, Crystal, Crystal system, Clemens

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