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session.masteringchemistry.com Resources previous | 8 of 17 I next Chapter 11 Homework ± Gas Law Stoichiometry ± Gas Law Stoichiometry Part A 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 Imagine that you have a 5.00 L gas tank and a 2.50 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 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. 2C2 H2 (g) +502 (g)-4CO2 (9) +2H2O(9) Express your answer with the appropriate units Hints P 77.5 atm Submit My Answers Give Up Incorrect; Try Again Continue

Explanation / Answer

Using ideal gas equation,

P V = n R T

SInce R and T are constant,

P 1 V1 / n1 = P2 V2 / n2

P1 * 2.50 / 2 = 155 * 5.0 / 5

P1 = 124 atm of C2H2

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