A 2m^3 weather balloon is loosely filled with helium at 1atm and at 27degree Cel

Question

A 2m^3 weather balloon is loosely filled with helium at 1atm and at 27degree Celsius.At an elevation of 20000ft,the atmospheric pressure is down to 38cm 6. A n automobile tire is pumped up toR C. What is its gauge pressure after the car has been running on à lBt ig eperature is 77 ? Assume that the volume remains fixed and take atmospherie pressure to be 1.013 × 105 Pa. A. 1.6×105 Pa B. 2.6×105 Pa C. 3.6×105 Pa D. 5.9×105 Pa E. 7.9×105 Pa ans: A 7. A sample of an ideal gas is compressed by a piston from 10 ma to 5mS and simultaneously cooled from 273° C to 0° C. As a result there is: A. an increase in pressure B. a decrease in pressure C. a decrease in density D. no change in density E an increase in density ans: E A 2-m3 weather balloon is loosely filled with helium at 1 atm (76 em Hg) and at 27P C. At an elevation of 20, 000 ft, the atmospheric pressure is down to 38 cm Hg and the helium has expanded, being under no constraint from the confining bag. If the temperature at this elevation is-48° C, the gas volume (in m3) is: A. 3 B. 4 C. 2 D. 2.5 E. 5.3 ans: A = 32 g) occupies a volume of 12 liters when its temperature is 20 liter atm/mol K, calculate the mass of the ox 0

Explanation / Answer

8. T1 = 273 + 27 = 300 K

P1 = 1atm

V1 = 2 m^3

T2 =273 - 48 = 225 K

P2 = 380 mmHg = 0.5 atm

P V / T = constant

(1 x 2)/300 = (0.05 x V)/225

V = 3 m^3

Ans(A)

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