Stoichiometry Problems

Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.

• 1.16%

• 116%

• 85%

• 76%

In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?

• 82%

• 0.82%

• 10.1 %

• 100%

Tags

NGSS.HS-PS1-7

In a lab where students reacted copper with silver nitrate. Silver, a product, was dried and massed at 8.3g. The accepted value is 9.0g, what is the percent error for this experiment?

• 1.1%

• 92.2%

• 7.7%

• Not enough information

Tags

NGSS.HS-PS1-7

When solving for gas stoichiometry problems which of the following are correctly matched?

• STP conditions; 22.4L/mole

• NON STP conditions; PV=nRT

• STP conditions; PV=nRT

• NON STP conditions; 22.4 moles

Mg₃N₂ + 3H₂O ––> 3 MgO + 2NH₃

If 10.3 g of magnesium nitride is used, what volume of ammonia gas would be collected at 20˚C and 0.989 atm?

Tags

NGSS.HS-PS1-7

How many liters of carbon monoxide at 25.0^oC and 8.56 mmHg are needed to react with 12.30 L of oxygen gas at STP?

How many liters of NH₃ are needed to react completely with 30.0L of NO if the reaction is conducted at STP?

What volume of hydrogen(H₂) will be produced at STP by the reaction 67.3 g of magnesium with excess water according to the following reaction? 1Mg (s) + 2H₂O (l) --> Mg(OH)₂ (aq) + H₂ (g)

What is the conversion factor that is found in all stoichiometry problems?

• Density Ratio

• Avagadro's Number

• Mole Ratio

Tags

NGSS.HS-PS1-7

Which of the following best describes stoichiometry?

• The study of the quantity of relationships between the reactants and products in a chemical reaction.

• The study of the how much matter takes up space in a vacuum.

• The study of periodic trends and how they relate to intermolecular forces.