How many liters of hydrogen gas can be produced at 300.0K and 1.55atm if 20.0g of sodium metal is reacted with water?

Answer 1

2Na + 2H2O ==> 2NaOH + H2
mols Na = grams/molar mass = ?
mols H2 = 1/2 that (look at the coefficients in the balanced equation).
Now use PV = nRT to convert mols to L at the conditions listed.