2.5 moles of oxygen react with 3.5 moles of hydrogen according to the following balance equation: 2H2 + 1 O2 - > 2 H2O. What is the ratio of limiting reactant started with/limiting reactant needed?

limiting reactant started with/limiting reactant needed=

= 3.5 mol/3.5 mol=1:1

Explanation:

2H2 + 1 O2 - --> 2 H2O

from reaction 2 mol 1 mol

given 3.5 mol 2.5 mol

needed 3.5 mol 1.75 mol

Excess reactant O2, Limiting reactant H2.

Limiting reactant will be used completely.

So, limiting reactant started with/limiting reactant needed=

= 3.5 mol/3.5 mol=1:1