Stoichiometry Review

What is a mol

• A unit to measure really small numbers of particles

• A unit to measure really large number of particles

• The mass of a substance

What does the law of conservation of matter state?

• Matter cannot be created or destroyed in a chemical reaction

• In a chemical reaction the types and numbers of atoms reacting are different than the products

• Elements combine to form compounds

Tags

NGSS.HS-PS1-7

What numbers in a balanced equation do we use to determine mole ratios?

• Subscripts

• Superscripts

• Coefficients

Tags

NGSS.HS-PS1-7

What is the mole ratio of NO to O₂

4 NH₃ (g)  +  5 O₂(g)  →  6 H₂O (g)  +  4 NO(g)

• 5 O₂ to 4 NO

• 4 NO to 6 O₂

• 4 NO to 5 O₂

Tags

NGSS.HS-PS1-7

Write the Plan for the following problem:

How many moles of NO are produced from 2.5 moles of O₂

4 NH₃ (g)  +  5 O₂(g)  →  6 H₂O (g)  +  4 NO(g)

• Plan = 2.5 moles O₂ 🡪 moles NO

• Plan = 2.5 moles NO 🡪 moles O₂

• Plan = moles NO 🡪 2.5 moles O₂

Tags

NGSS.HS-PS1-7

How many moles of NO are produced from 2.5 moles of O₂

4 NH₃ (g)  +  5 O₂(g)  →  6 H₂O (g)  +  4 NO(g)

• 4 moles NO

• 3.1 moles NO

• 2 moles NO

Tags

NGSS.HS-PS1-7

Write the Plan for the following problem:

How many grams of H₂O are produced from 2 moles of NH₃?

4 NH₃ (g)  +  5 O₂(g)  →  6 H₂O (g)  +  4 NO(g)

• 2 mol NH₃ → mol H₂O → g H₂O

• 2 mol NH₃ → g H₂O → H₂O

• g H₂ → O2 mol NH₃ → mol H₂O

Tags

NGSS.HS-PS1-7

How many grams of H₂O are produced from 2 moles of NH₃?

4 NH₃ (g)  +  5 O₂(g)  →  6 H₂O (g)  +  4 NO(g)

• 24 grams water

• 54 grams water

• 0.16 grams water

Tags

NGSS.HS-PS1-7

Write the Plan for the following problem:

How many moles of NO are produced from 3 grams of NH₃?

4 NH₃ (g)  +  5 O₂(g)  →  6 H₂O (g)  +  4 NO(g)

• mol NO3 → g NH₃ → mol NH₃

• 3 g NH₃ → mol NO → NH₃

• 3 g NH₃ → mol NH₃ → mol NO

Tags

NGSS.HS-PS1-7

How many moles of NO are produced from 3 grams of NH₃?

4 NH₃ (g)  +  5 O₂(g)  →  6 H₂O (g)  +  4 NO(g)

• 51 mol NO

• 0.18 mol NO

• 12.75 mol NO

Tags

NGSS.HS-PS1-7