Question

How many liters of water vapor can be made from the reaction of 23.8 grams of H2 with excess O2 at standard temperature and pressure?

2 H2 (g) + O2 (g) → 2 H2O (g)

Answer 1

moles of hydrogen=mass/mw
as from stoichiometery coefficeint moles of hydrogen will be equal to moles of water vapour
so just find the mole :))