Homework 4

# Homework 4 - Homework 4 questions Fall 2009 1 At what...

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1 Homework 4 questions – Fall 2009 1. At what temperature does 1.00 atm of He gas have the same density as 1.00 atm of Ar gas at 273 K? A. 1.78 K B. 27.4 K C. 87.0 K D. 273 K E. 2.73 × 10 3 K 2. A balloon is filled with N 2 gas to a volume of 1.92 L at 37 °C. The balloon is placed in liquid nitrogen until its temperature reaches -142 °C. Assuming the pressure remains constant, what is the volume of the cooled balloon? A. -0.500 L B. 0.500 L C. 0.811 L D. 1.43 L E. 4.54 L 3. A 0.225-L flask contains CO 2 at 22 °C and 451 mm Hg. What is the pressure of the CO 2 if the volume is increased to 0.600 L and the temperature increased to 85 °C? A. 43.8 mm Hg B. 139 mm Hg C. 205 mm Hg D. 653mm Hg E. 991 mm Hg 4. If 3.67 g of CO 2 gas is introduced into an evacuated 2.50 L flask at 65 °C, what is the pressure inside the flask? ( R = 0.08206 L·atm/mol·K) A. 0.178 atm B. 0.445 atm C. 0.925 atm D. 40.7 atm E. 496 atm

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2 5. The pressure of N 2 in a 20.0 L flask is 0.603 atm at 62 °C. What mass of N 2 is in the flask? ( R = 0.08206 L·atm/mol·K) A. 0.439 g B. 6.15 g C. 12.3 g D. 63.9 g E. 66.4 g 6. If the density of N 2 gas in a rigid flask is 0.243 g/L at 18 °C, what is the pressure of nitrogen in the flask if it is heated to 36 °C? ( R
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## This note was uploaded on 09/28/2010 for the course CHE 210 taught by Professor Dr.elbehlil during the Spring '10 term at Kansas State University.

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Homework 4 - Homework 4 questions Fall 2009 1 At what...

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