Chapter 12 - Stoichiometry

Given the unbalanced equation to create ammonia (N₂ + H₂ → NH₃), how many grams of hydrogen are needed to produce 5 moles of ammonia?

• 7.5 mol NH₃

• 15 mol NH₃

• 17 mol NH₃

• 5.7 mol NH₃

After balancing the equation: BiCl₃ + H₂S →Bi₂S₃ + HCl, how many moles of HCl are produced?

• 1 mol HCl

• 8 mol HCl

• 3 mol HCl

• 6 mol HCl

Find the total number of all possible mole ratios: C₃H₈ + O₂ →CO₂ + H₂O

• 9

• 12

• 3

• 4

Balance the following chemical equation, C₆H₁₄ + O₂ → CO₂ + H₂O , then find the limiting reagent given 20.1 grams of O₂ reacts with 15.8 grams of C₆H₁₄ . (number sequence is numbers to balance equation)

• 2,19,12,14 ; C₆H₁₄ is limiting reagent

• 1,9,6,7 ; O₂ is limiting reagent

• 2,19,12,14 ; O₂ is limiting reagent

• 1,9,6,7 ; C₆H₁₄ is limiting reagent

Tags

NGSS.HS-PS1-7

If 50.0 g of silicon dioxide is heated with an excess of carbon, 27.9 g of silicon carbide is produced. What is the percent yield of this reaction?

SiO₂(s) + 3C(s) →SiC(s) + 2CO (g)

• 83.5%

• 29.0%

• 67.2%

• 45.1%

In the given unbalanced equation H₂O₂ → H₂O + O₂, what is the theoretical yield of H₂O in grams if 6 moles of H₂O₂ is decomposed?

• 100 g H₂O

• 144 g H₂O

• 108 g H₂O

• 128 g H₂O

Tags

NGSS.HS-PS1-7

The following equation represents a laboratory preparation for oxygen gas: 2KClO₃(s) ￫ 2KCl (s) + 3O₂ (g). How many moles of O₂ form if 3.0 mol of KClO₃ are totally consumed?

• 5.0 mol O₂

• 6.5 mol O₂

• 4.5 mol O₂

• 5.7 mol O₂

What is meant by ideal conditions relative to stoichiometric calculations?

• stoichiometric calculations solved for under ideal conditions

• the limiting reactant is completely converted to product with no losses, as dictated by the ratio of coefficients

• the absence of limiting and excess reagents

Measurements of a compound reveal that it is 36% carbon, 6% hydrogen,and 48% oxygen, with a systematic error accounting for the remaining 10%. Which of the following is the most accurate empirical formula for this compound?

• C₁H₁O₂

• C₁H₂O₁

• C₂H₁O₁

• C₂H₁O₂

Tags

NGSS.HS-PS1-1

When an antacid tablet is used, calcium hydroxide interacts with hydrochloric acid in the stomach to produced inert calcium chloride (CaCl₂) and water. If the molar mass of Ca(OH)₂ is 75 grams/mol, how many moles of HCl are required to fully react with 150 g of Ca(OH)₂?

• 4 mol HCl

• 1 mol HCl

• 8 mol HCl

• 2 mol HCl