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A common mixture of gases in circuit breakers include 71.4% sulfur Hexafluoride (SF6) and 28.6% nitrogen by mass.

a) What are the sulfur hexafluoride and nitrogen partial pressure of a 20.0 degree Celcius sample if this mixture is delivered at a total pressure of 4.93 atm?

b) Calculate the sulfur hexafluoride partial pressure when a circuit breaker with this gas mixture reaches its rated limit of -40.0 degree celcius.

c) How does the density of the gas in the circuit breaker change as the temperature drops?

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