Acetylene torches are used for welding These torches use a mixture of acetylene

Question

Acetylene torches are used for welding These torches use a mixture of acetylene gas. C_2H_2, and oxygen gas. O_2 to produce the following combustion reaction: 2C_2H_2(g)+ 5O_2 (g) rightarrow 4 CO_2 + 2H_2O Imagine that you have a 7 00 L gas lank and a 4 50 L gas tank You need to fa one tank with oxygen and the other with acetytene to use in conjunction with your welding torch. If you fill the larger tank with oxygen to a pressure of 155 atm. 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. Express your answer with the appropriate units.

Explanation / Answer

for oxygen

V1 = 7.00 L

P1 = 155 atm

n1 = 5

for acytlene

V2 = 4.50 L

P2 = ?

n2 = 2

P1 V1 / n1 = P2 V2 / n2 ------------------> formula

155 x 7.0 / 5 = P2 x 4.50 / 2

P2 = 96.4 atm ---------------------> answer

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