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, C2H2, and oxygen gas, O2 to produce the following combustion reaction: 2C2H2(t) + 5O2(g)rightarrow4CO2(g) + 2H2O(g) Imagine that you have a 5.50 L gas tank and a 4.50 L 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 105 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. P = atm

Explanation / Answer

look here only one formula for this one: PV = nRT now for Oxygen: P =105 atm V = 5.5 L R= 0.082 T= 298 n= ? n = (PV)/(RT) = 23.63 mol now we need to use stochiometry to get n for another gas acetylene. 2C2H2 + 5O2 ---- 4CO2 +2H2O 5 O2 require 2 C2H223.63 O2 require ? C2H2 = (23.63*2)/5 = 9.45 now for acetylene u have n= 9.45 mol V = 4.5 L R = 0.082 T= 298 p = ? PV = nRT P = (nRT)/V = 51.33 atm so ans = 51.33 atm u got it?

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