Ex-1-3530-S10 - CHEM 3530 Exam 1(57 PART I MULTIPLE...

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CHEM 3530 - Exam 1 – February 12, 2010 (57) PART I. MULTIPLE CHOICE (Circle the ONE correct answer) 1. A sample of decane, C 10 H 22 , contains 5.0x10 24 atoms of Hydrogen. What is the mass of the sample? (A) 28.4 g (B) 53.6 g (C) 1180 g (D) 2.6x10 4 g 2. The volume of a sample of N 2 (g) at 600 torr and 200 o C is 400 mL. What is the volume of the N 2 at 350 torr and 100 o C? 3. A 20. L container contains 1.2x10 24 molecules of CO 2 at a temperature of 150 o C. What is the pressure of the gas, in bar . 4. A sample of an unknown gas has a density of 6.0 g/L at a temperature of 300 K and pressure of 250 kPa. The Molar Mass of this sample is: 5. A container has a gaseous mixture of 8.0 grams of He(g) and 96. grams of CH 4 (g). The partial pressure of He(g) in the mixture is 0.3 bar. What is the total pressure of both gases? (A) 3.9 bar (B) 2.4 bar (C) 1.2 bar (D) 0.9 bar 6. The RMS average speed of SO 2 molecules at 1000 o C is 700 m/s. What is the RMS average speed of SO 2 molecules at 25 o C?
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