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Assume you have an infinitely expandable balloon, such that the elasticity of the balloon material does not exert any additional pressure on the contents of the balloon. Assume that the volume of the balloon is 200 m3, the balloon is full of dry air, the temperature is 290 K, and the pressure is 2000 mbar. (Hint: 1 J = 1 Nm, 1 mbar = 100 Pa or 100 Nm-2, avg. molecular weight for air is 28.9 g mole-1, Avogadro's Number is 6.02 x 1023 molecules mole-1, R = 8.314 J mole-1K-1)
1. What is the concentration of air (in molecules x cm-3) in the balloon?
2. What is the density of air in the balloon? (in kg x m-3)
3. If the pressure outside the balloon was decreased to 1000 mbar and the temperature dropped to 265 K what would be the new volume (in m3
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