Chemistry
posted by George .
Imagine that you have a 7.00 gas tank and a 3.00 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 145 , to what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time?
Is the answer 62.1 atm

I ran through the calculations and didn't get 62.1 atm. Show your work and I'll check our calculations.
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