Unit 7 Stoichiometry Quiz

What is the conversion factor that allows you to convert between moles of one compound and moles of another compound?

• molar mass
• stoichiometry
• Avogadro's Number
• mole ratio

Where can we calculate molar mass which is measured in grams?

• Given value
• Periodic table
• molar mass cannot be calculated
• Coefficients from the chemical equation

How many L are equal to 1 mol?

• Calculate them off the periodic table
• 22.4
• Mole ratio
• 6.02 X 10(23)

How many molecules are equal to 1 mol?

• Calculate them off the periodic table
• 22.4
• Mole ratio
• 6.02 X 10(23)

N₂ + 3H₂ → 2NH₃ What is the mole ratio between NH₃ and N₂ in the above reaction?

• 1 moles NH3 : 2 moles N2
• 2 moles NH3 : 3 moles N2
• 2 moles NH3 : 1 moles N2
• 3 moles NH3 : 2 moles N2

Tags

NGSS.HS-PS1-7

P₄O₁₀ + 6 H₂O --> 4 H₃PO₄ What is the mole ratio of H₂O to H₃PO₄ in the chemical equation above?

• 6 moles H2O : 4 moles H3PO4
• 1 mole H2O : 3 moles H3PO4
• 4 moles H2O : 6 moles H3PO4
• 3 moles H2O : 1 moles H3PO4

Tags

NGSS.HS-PS1-7

4NH₃ + 5O₂ -->4NO + 6H₂O What is the total number of moles of H₂O produced when 12 moles of NH₃ is completely consumed?

• 15 moles
• 20 moles
• 18 moles
• 24 moles

Tags

NGSS.HS-PS1-7

Cl₂ + 2KBr → Br₂ + 2KCl How many grams of Br₂ can be produced from 356 g of KBr?

• 2.99 g Br2
• 1.50 g Br2
• 9.10 g Br2
• 239 g Br2

Tags

NGSS.HS-PS1-7

Fe₂O₃ + 3H₂ → 2Fe + 3H₂O How many moles of iron can be made from 3 moles of Fe₂O₃?

• 6 moles Fe
• 2 moles Fe
• 4 moles Fe
• 1 mole Fe

Fe₂O₃ + 3H₂ → 2Fe + 3H₂O How many molecules of iron can be made from 35 liters of Fe₂O₃?

• 6.7 X 10(23) molecules Fe
• 1.8 X 10(24) molecules Fe
• 3.1 X 10(24) molecules Fe
• 2.6 X 10(23) molecules Fe

Tags

NGSS.HS-PS1-7