Introduction to Stoichiometry

Consider the reaction:

A + B --> C + D

A and B in this reaction are called:

• feed components

• output components

• reactants

• products

Consider the reaction:

A + 2B --> 3C + D

Which of these ratios is correct?

• 2 moles B consumed

  ---

  1 mole C generated

• 1 mole A generated

  ---

  1 mole D consumed

• 2 moles B consumed

  ---

  1 mole A consumed

• 3 moles C consumed

  ---

  1 mole A generated

The limiting reactant in a reaction is the reactant:

• which has less number of moles

• which is more important for getting the products

• which is completely consumed if reaction proceeds to completion

• which is of limiting importance in the reaction

The excess reactant in a reaction is the reactant which is:

• going to come out of the reactor

• supplied in more amounts than the stoichiometric proportions

• having a greater number of moles

• not used in the reaction

The reaction: Na₂SO₄ + β HCl → 2NaCl + H₂SO₄

can be balanced when β is equal to

• 0

• 1

• 2

• 0.5

In the reaction:

2H₂ + O₂ → 2H₂O

If 320 g of O₂ is used in the reaction, then the grams of H₂O produced is:

• 160

• 320

• 360

• 640

C₄H₈ + 6O₂ → 4CO₂ + 4H₂O

In the reaction, the stoichiometric coefficient of CO₂ is:

• 1

• 4

• 4/6

• 1/4

In this reaction:

C₄H₈ + 6O₂ → 4CO₂ + 4H₂O

If 100 mol of C₄H₈ , 300 moles of O₂ , 40 moles of CO₂ , and 80 moles of H₂O are fed to the reactor, then the limiting reactant is:

• C₄H₈

• O₂

• CO₂

• H₂O

in the reaction, A + 2B → C + 3D

20 moles of A are reacted with 30 moles of B. The percentage excess of the excess reactant is:

• 5

• 33

• 25

• 10

2A + 3B → C + 4D

We can see from this reaction that:

• 2 moles of A will react to give 4 moles of D

• 3 grams of B will react to form 1 g of C

• 2 moles of A will react to give 3 moles of B

• 2 grams of A will react with 3 grams of B