1 of 11> Constants | Periodic Table Part A Acetylene torches are used for weldin

Question

1 of 11> Constants | Periodic Table Part A Acetylene torches are used for welding. These torches use a mixture of acetylene gas, C2H2, and oxygen gas, 02 to produce the following 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 2C2H2 (g) + 502 (g)4CO2 (g) + 2H2O (g) Express your answer with the appropriate units View Available Hint(s) PValue Units Submit

Explanation / Answer

balanced equation :

2 C2H2   + 5 O2 -------------------------------> 4 CO2 + 2 H2O

P1 = pressure of O2 = 105 atm

V1 = volume of O2 =5.50 L

n1 = moles of O2 = 5

P2 = pressure of C2H2 = ? atm

V2 = volume of C2H2 = 4.50 L

n2 = moles of C2H2 = 2

P1 V1 / n1 = P2 V2 / n2

105 x 5.50 / 5 = P2 x 4.5 / 2

P2 = 51.3 atm

answer : P = 51.3 atm

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