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: 2 c2h2 (g) + 5 o2 (g) → 4 co2 (g) + 2 h2o (g) imagine that you have a 5 l gas tank and a 3.5 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 127 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.

72.6 atm should be the  pressure at which acetylene tank.

Explanation:

Let the temperature of the both tanks be same as T.

Volume of the tank in which oxygen is filled =

Pressure of the oxygen in tank == 127 atm

According to reaction 5 moles of oxygen reacts with 2 moles of acetylene.

..[1]

Volume of the tank in which acetylene is filled =

Pressure of the acetylene in tank == ?

..[2]

[1] = [2]

72.6 atm should be the  pressure at which acetylene tank.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.