Question

for proceses 2h2 +o2=2h2o which reactants is the limiting reagent if 6 mol of h2 and 4 mol of o2 are used?

a)H2

b)O2

c)neither H2, O2

d)both H2, O2

Answer 1

Explanation:

A mole ratio is ​the ratio between the amounts in moles of any two compounds involved in a chemical reaction. The mole ratio can be determined by examining the coefficients in front of formulas in a balanced chemical equation.

Step 1: write the balanced chemical equation.

2 H₂ + O₂ ----------> 2 H₂O

Step 2: calculate the moles of H₂ and O₂

Given,

Moles of H₂ = 6 mol

Moles of O₂ = 4 mol

Step 3: Determine the limiting reagent

2 H₂ + O₂ ----------> 2 H₂O

According to the reaction we need
2 mol of   H₂ requires for 1 mol of   O₂
so, for 6 mol of H₂we will need =( 1 mol of O₂ / 2 mol of H₂)× 6 mol of H₂   = 3 mol of O₂
Since we need only 3 mol of O₂ hence O₂ is in excess ( since given = 4 mol ) and H₂  limiting reagent.

so the amount of product will formed according to the limiting reagent ( i.e H₂amount )

Hence, The limiting reagent = H₂ ---------> option(a)