Question

Esay 1,050 pts!

1) 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(g)+5O2(g)?4CO2(g)+2H2O(g

Imagine that you have a 5.00L gas tank and a 2.00L gas tank. Youneed to fill one tank with oxygen and the other with acetylene touse in conjunction with your welding torch. If you fill the largertank with oxygen to a pressure of 125atm , to what pressure shouldyou fill the acetylene tank to ensure that you run out of each gasat the same time? Assume ideal behavior for all gases.

(781 atm is wrong and 1562 atm is wrongtoo)

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2) (use pv=nRT)

When heated, calcium carbonate decomposes to yield calcium oxideand carbon dioxide gas via the reaction

CaCO3(s)?CaO(s)+CO2(g)

What is the mass of calcium carbonate needed to produce 73.0L ofcarbon dioxide at STP?

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3) (use pv=nRT)

Butane, C4H10, is a component of natural gas that is used asfuel for cigarette lighters. The balanced equation of the completecombustion of butane is

2C4H10(g)+13O2(g)?8CO2(g)+10H2O(l)

At 1.00 atm and 23 ?C, what is the volume of carbon dioxideformed by the combustion of 3.20g of butane?

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4)

Consider the chemical reaction:
2H2O(l)?2H2(g)+O2(g)

What mass of H2O is required to form 1.3L of O2 at a temperatureof 325K and a pressure of 0.966atm ?