Limited Excess

What is the limiting reactant if 15 GRAMS of NH₃ react with 16 GRAMS of NO?
4NH₃+6NO --> 5N₂ + 6H₂O
(Remember, convert grams to moles, then divide each substance by the number of moles given as the coefficient from the balanced chemical equation).

• NH₃ is the limiting because the reaction only requires 0.22 mol of NH₃

• NO is the limiting reactant because the reaction only requires 0.088 mol NO 

• NH₃ is the limiting because the reaction only requires 0.88 mol of NH₃

• NO is the limiting reactant because the reaction only requires 0.53 mol NO 

Tags

NGSS.HS-PS1-7

What are the correct steps for determining the limiting reactant?

• divide each reactant by its molar mass and look for the smallest number

• balance the chemical equation and look for the smallest coefficient

• divide the moles of each reactant by its coefficient and look for the smallest number

• divide each reactant by Avogadro's number and look for the smallest number

True or False?
A chemical reaction stops before the limiting reagent is used up.

• True

• False

Tags

NGSS.HS-PS1-7

When does a reaction stop?

• When it wants to

• When both the limiting and excess reactants are gone

• When all the excess reactant has been consumed

• When all the limiting reactant has been consumed

Tags

NGSS.HS-PS1-7

What is the limiting reactant if 10 moles of NH₃  react  with 30.0 moles of NO?
4NH₃+6NO --> 5N₂ + 6H₂O

• NH₃

• NO

• N₂

• water

Tags

NGSS.HS-PS1-7

What is the limiting reactant if 15 moles of NH₃  react  with 16 moles of NO?
4NH₃+6NO --> 5N₂ + 6H₂O

• NH₃

• NO

• N₂

• water

Tags

NGSS.HS-PS1-7

A reactant that is totally consumed during a chemical reaction, limits the extent of the reaction, and determines the amount of product

• stoichiometry

• mole ratio

• excess reactant

• limiting reactant
  

Tags

NGSS.HS-PS1-7

What is the limiting reactant if 10 grams of H_2 react with 20 grams of O_2? 2H_2 + O_2 -> 2H_2O

• H_2 is the limiting reactant because the reaction requires 0.5 mol of H_2

• O_2 is the limiting reactant because the reaction requires 0.625 mol of O_2

• H_2 is the limiting reactant because the reaction requires 0.25 mol of H_2

• O_2 is the limiting reactant because the reaction requires 0.5 mol of O_2

Tags

NGSS.HS-PS1-7

In a reaction between 5 moles of A and 10 moles of B, which is the limiting reactant if the balanced equation is 2A + 3B -> C?

• A is the limiting reactant

• B is the limiting reactant

• Both A and B are limiting reactants

• Neither A nor B is a limiting reactant

Tags

NGSS.HS-PS1-7

True or False? The excess reactant is completely consumed in a chemical reaction.

• True

• False