a gas over liquid lifting device has a 200 gallon reservior in which the pressur

Question

a gas over liquid lifting device has a 200 gallon reservior in which the pressure within the reservior is raised by 200 lbf/in2. gas is routed through a check valve to the gas over liquid reservior to control the hydraulic output pressure from the reservior. the reservior is 2/3 full when the lift is lowered and 1/3 full when the lift is fully raised. if the lift has a load attached that creates a back pressure that holds the check valve closed and therefore keeps the lift from lowering, what is the resultant pressure in the reservior?

Explanation / Answer

p1/n1=p2/n2; (volume of tank remain const. and T but gas is taken out so, moles are changing)

p1=200;

n1=2/3x;

p2=?

n2=1/3x;

so, p2=200/2=100;

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