Mass to Mass Stoichiometry

CH₄ + 2O₂ --> 2H₂O + CO₂
What is the mass of CO₂ produced when 35g of O₂ reacts? 

• 1.09 g
• 24.1 g
• 28.2 g
• 44.0 g

Tags

NGSS.HS-PS1-7

Cl₂ + 2KBr → Br₂ + 2KCl

How many grams of potassium chloride (KCl) can be produced from 356 g of potassium bromide (KBr)?

• 749 g

• 223 g

• 479 g

• 814 g

Tags

NGSS.HS-PS1-7

From the reaction: B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O

What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

• 13.8 g O₂

• 3.91 mol of O₂

• 125 g O₂

• 41.7 g O₂

Tags

NGSS.HS-PS1-7

2Na + 2H₂O → 2NaOH+ H₂
How many grams of hydrogen are produced if 120 g of Na are available?

• 5.2 g
• 2.6 g
• 690 g
• 45 g

Tags

NGSS.HS-PS1-7

What is the correct first step in solving any mass‑to‑mass stoichiometry problem?

• Use the mole ratio to convert moles of the given substance to moles of the unknown

• Convert the given mass of a substance into moles

• Convert moles of the unknown substance into grams

• Add the molar masses of all reactants

Tags

NGSS.HS-PS1-7

After converting the given mass to moles, what is the next step in a mass‑to‑mass stoichiometry calculation?

• Convert the moles of the given substance directly into grams of the unknown

• Use the mole ratio from the balanced equation to find moles of the unknown substance

• Add the molar masses of all reactants

• Convert grams of the unknown into moles

Tags

NGSS.HS-PS1-7

What is the final step in solving a mass‑to‑mass stoichiometry problem?

• Use the mole ratio to convert moles of the given substance to moles of the unknown

• Convert the given mass into moles

• Convert moles of the unknown substance into grams using its molar mass

• Balance the chemical equation again to check your work