Assume that $13\mathrm{.}5$ grams of solid aluminum react with $HCl$ according to the following balanced equation at STP:

$2Al(s)+6HCl(aq)?2AlC{l}_3(aq)+3H_2(g)$

a$.$ How many moles of $Al$ react?

b$.$ How many moles of $H_2$ are produced?

c$.$ How many liters of $H_2$ are produced?

$9.$ If air is $20\mathrm{.}9\%$ oxygen by volume,

a$.$ How many liters of air are needed to complete the combustion of $25\mathrm{.}0L$ of octane vapor $(C_8{H}_{18})$ at STP$?$

b$.$ What volume of each product is produced? How do I do question $8$ a and all of $9$ with steps and explanation please