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how many grams of H2 gas are present in a 44.0 L fuel tank at a...

how many grams of H2 gas are present in a 44.0 L fuel tank at a pressure of 2720 lb/in2 (psi) at 20 degrees Celsius? Assume that 1 atm= 14.7 psi.

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Answer #1

Volume = 44.0L

Pressure = 2720 lb/in2 =2720/14.7 atm =185.03atm

T = 20oC = 293K

Apply ideal gas equation to find no. of moles of H2 present in tank.

PV = nRT

P = pressure in tank =185.03atm

V = volume of tank = 44.0L

n = no. of moles of gas present.

R = real gas constant = 0.082 L atm K-1 mol-1

T = temperature of tank = 293K

185.03*44.0 = n*0.082*293

n = 338.854

No. of moles of H2 present in tank is 338.854.

moles = given mass/mass of given compound

338.854 = given mass/2

given mass = 677.708g

So 677.708g of H2 gas  is present in the tank.

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