Stoichiometry Calculations

Why is the mass of one mole of a substance numerically equal to its molar mass in grams?

• The mass of one mole of a substance is numerically equal to its molar mass in grams due to the substance's taste

• The mass of one mole of a substance is numerically equal to its molar mass in grams because of the substance's odor

• The mass of one mole of a substance is numerically equal to its molar mass in grams due to the definition of the mole being based on the number of entities in 12 grams of carbon-12.

• The mass of one mole of a substance is numerically equal to its molar mass in grams because of the color of the substance

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NGSS.HS-PS1-7

How does Avogadro's number relate to the concept of the mole?

• Avogadro's number is equal to the speed of light

• Avogadro's number is a unit of volume

• Avogadro's number is used to measure temperature

• Avogadro's number is the number of particles in one mole of a substance and is essential in understanding the concept of the mole.

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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

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NGSS.HS-PS1-7

How many moles of P₄O₆ can be made if 3 moles of P₄ react with 6 moles of O₂?

• 1 mole

• 2 moles

• 4 moles

• 0 moles

Tags

NGSS.HS-PS1-7

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃. If 2 moles of aluminum and 3 moles of chlorine are reacted, how much AlCl₃ can be made?

• 1 mole

• 2 moles

• 4 moles

• 0 moles

Tags

NGSS.HS-PS1-7

Identify the limiting and excess reactants in the reaction shown.

• N₂ is limiting and H₂ is excess. 

• H₂ is limiting and N₂ is excess. 

• NH₃ is both limiting and excess.

• There is no limiting reactant. 

Tags

NGSS.HS-PS1-7

What is a limiting reactant?

• the reactant that determines how much product can be made

• the reactant that is in excess

• the product that you can make the most of

• the amount of reactants that react with each other

When 12 moles of O₂ reacts with 1.1 mole of C₁₀H₈ what is the limiting reactant?  C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

• Oxygen

• C₁₀H₈

• Water

• Carbon Dioxide

Tags

NGSS.HS-PS1-7

The limiting reactant

• slows the reaction down

• is used up first

• is the reactant that is left over

• controls the speed of the reaction

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃. If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

• AlCl₃

• Cl₂

• Al

Tags

NGSS.HS-PS1-7