posted by b .
Aluminum granules are a component of some drain cleaners because they react with sodium hydroxide to release both energy and gas bubbles to help clear the drain clog. The reaction is:
2NaOH + Al + 6H2O 2NaAl(OH)4 + 3H2
(note: balance the reaction first)
What mass of Aluminum would be needed to produce 4L of hydrogen gas at STP?
2NaOH + 2Al + 6H2O 2NaAl(OH)4 + 3H2
Use PV = nRT and solve for n = mols H2 OR remember at STP 1 mol occupies 22.4L.
Using the coefficients in the balanced equation, convert mols H2 to mols Al
Then mols Al = grams/atomic mass. You know atomic mass and mols, solve for grms.