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Maybelline Cousteau’s backup oxygen tank reads 650 torr while on her boat, where the temperature is 27 degrees C. When she dives down to the bottom of an unexplored methane lake on a recently-discovered moon of Neptune, the temperature will drop down to –183 degrees C. What will the pressure in her backup tank be at that temperature?

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tutorAnne

Answer: 180torr

Explanation:

Using P1VI/T1= P2V2/T2

where

p1= 650 torr

p2=??

T1= 27°C =  27°C + 273= 300K

T2= -183°C= -183°C +273=90K

V1= V2 ie volume is constant

SOLUTION

 1 torr= 1mmHg

P1VI/T1= P2V2/T2, where V1=V2

= P1/TI= P2/T2

600/300=P2/90

P2= 600X90/300= 180 torr

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