Volume @ STP

All of the problems in this set are stoichiometry problems with at least one equation participant as a gas at STP. These questions always refer to chemical reaction.So before we calculating,we must write and balance the equation.You will be given an amount of one of the equation to calculate how much another one of the equation.We know:1 mol of gas=22.4 liters at STP.If the question refer to the mass of one of the equation, we must use the formula weight of the material to change from mass to mols.Then we can work out the volume of the gas of that equation.Here is an example.

10 grams of calcium carbonate,CaCO_3,was produced when carbon dioxide was added to lime water (calcium hydroxide in solution). What volume of carbon dioxide at STP was needed?

Given:10 grams of CaCO₃ (the mass of CaCO₃)
Find:the volume of carbon dioxide(in liters at STP)

CO₂   +   Ca(OH)₂     CaCO₃   +   H₂O

Look~we work out the question!

BUT!NOTICE!IT'S At STP only!

Now let's look the map,it's the relationship between mass,moles&volume.

Then you can deal with all this kind of questions,can't you?