In the second experiment, another flask is used for a combustion reaction.
Method
Remove all the air from the flask.
Add 0.0010 mol of 2,2,4-trimethylpentane (CaHi) to the flask.
Add 0.0200 mol of oxygen to the flask.
Spark the mixture to ensure complete combustion.
Cool the mixture to the original temperature.
The equation is

C8H18(g) + 12.5O2(g) ——> 8 CO2(g) + 9 H20(l)

Calculate the amount, in moles, of gas in the flask after the reaction.