TH10Set05 - 8.314 m 113.1 kPa 200 T R pV moles m 113.1 3...

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Problem Set 5, PS4 due Friday May 28 2-68 A spherical balloon has a diameter of 6 meters and is filled with helium at 20 C and 200 kpa. Determine the number of moles and the mass of the helium in the balloon. 2-71 The air in a .53 ft 3 tire is at 90 F and 20 psig. How much air must be added to the tire to raise the pressure to 30 psig. Assume atmospheric pressure is 14.6 psia the temperature remains constant and volume of the tire does not increase. PS5-1 PS5-2
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() () kg 7.19 3 K 20 273.15 K kg / m kPa 2.075 m 113.1 kPa 200 RT pV mass R kg m Pa k 2.076 kg 4.03kmole/ K /kmole 8.314kPam R kmole 9.28 K 20 273.15 K /kmole m kPa
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Unformatted text preview: 8.314 m 113.1 kPa 200 T R pV moles m 113.1 3 3.1416 3 4 R 3 4 V 3 3 3 3 3 3 * 3 3 3 sphere = + = = = = = + = = = = = 2-68 PS5-1 2-71 PS5-2 ( ) lb .0225 lb .09-lb .1128 added air lbs .1128 psia 35.6 psia 44.6 lb .09 p p m m p T m p T m p T R m V constant V and T lb .09 R 90 459.69 R /lb tlb f 53.35 ft .53 /ft in 144 psia 34.6 RT pV m psia 44.6 14.6 30 p addition air after 2 state psia 34.6 6 . 14 20. p air of addition before 1 state 1 2 1 2 2 2 2 1 1 1 m f 3 2 2 1 2 1 = = = = = = = = = = + = = = + = = + =...
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TH10Set05 - 8.314 m 113.1 kPa 200 T R pV moles m 113.1 3...

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