Question

At STP, how many liters of oxygen are required to react completely with 3.6 liters of hydrogen to form water?

2H2(g) + O2(g) ® 2H2O(g)

a) 3.6 L

b) 2.0 L

c) 2.4 L

d) 1.8 L

Answer 1

Should be 1.8L.
2 moles of hydrogen react with 1 mole of oxygen. If 2 moles of hydrogen is 3.6L, 1 mole of oxygen should be 1.8L.