Please tell me HOW to solve these chemistry problems about gas laws and...

[Laura]

...stoichiometry!!!? i just want to know how to do this type of problem so i can do them myself.

Determine the volume of hydrogen gas needed to react completely with 2.72 L of oxygen gas to form water.

How many liters of propane gas (C3H8) will undergo complete combustion with 26.1 L of oxygen gas?

Calcium carbonate forms limestone, one of the most common rocks on Earth. It also forms stalactites, stalagmites, and many other types of formations found in caves. When calcium carbonate is heated, it decomposes to form solid calcium oxide and carbon dioxide gas.
CaCO3(s) CaO(s) + CO2(g)

How many liters of carbon dioxide will be produced at STP if 2.55 kg of calcium carbonate reacts completely?

When iron rusts, it undergoes a reaction with oxygen to form iron(III) oxide.
4 Fe(s) + 3 O2(g) 2 Fe2O3(s)

Calculate the volume of oxygen gas at STP that is required to completely react with 62.4 g of iron.