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Suppose a helium balloon is a perfect sphere, with volume = 2.44 x 10-2 m3. Suppose...

Suppose a helium balloon is a perfect sphere, with volume = 2.44 x 10-2 m3. Suppose at room temperature (20o C) its internal pressure is 1.06 x 105 Pa. Remember also that K = 273 + C.

(a) How many moles of gas are present?

(b) Now suppose that the temperature is raised to 40o C while holding the volume constant. What variable changes? What is its new value?

(c) Now suppose the balloon is allowed to expand from the situation in (b), so that its new volume is 2.53 x 10-2 m3, while the pressure is kept constant. What variable changes? What is its new value?

(d) Now suppose the temperature is kept constant at the value found in (c), but the pressure is increased to 1.2 x 105 Pa. Now what variable changes, and what is its new value?

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