2C2H2 + 5O2 --> 4CO2 + 2H2O
I assume the T is constant.
Use PV = nRT. Plug in P = 145 atm
V = 7.00 L
N = ?
R = 0.08206
T = not given but I would use any convenient number, say 300.
Solve for n of O2.
Use n and the equation to convert to mols C2H2, plug that n back into PV = nRT and the same T and R, along with v = 4.00L and solve for P C2H2.
Post your work if you get stuck.
Imagine that you have a 7.00L gas tank and a 4.00L gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 145atm , to what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? Assume ideal behavior for all gases.
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