Stoichiometry Review

Given the equation:

2NaClO₃ (s) → 2NaCl (s) + 3O₂ (g)

When 2.00 moles of NaClO₃ react, how many grams of O₂ is produced?

• 56 g of O₂

• 96 g of O₂

• 64 g O₂

• 32 g O₂

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

• Subscripts

• Superscripts

• Coefficients

___KNO₃ → ___KNO₂ + ___O₂

What coefficients are needed to balance the reaction?

• 2, 2, 1

• 2, 3, 2

• 1, 2, 2

• 1, 3, 1

Tags

NGSS.HS-PS1-7

2 NaClO₃ (s) → 2NaCl (s) +3 O₂ (g)

How many grams of O₂ will be produced from 12.00 moles of NaClO₃?

• 256 g of O₂

• 576 g of O₂

• 288 g O₂

• 32 g O₂

2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂

How many grams of aluminum sulfate would be formed if 250g H₂SO₄ completely reacted with aluminum?

• 0.85 g

• 290 g

• 450 g

• 870 g

Tags

NGSS.HS-PS1-7

Using the following equation:
Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)
How many moles of iron can be made from  6 moles H₂? 

• 4 moles Fe
• 6 moles Fe
• 9 moles Fe
• 2 moles Fe

Tags

NGSS.HS-PS1-7

Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g)

How many moles of HCl are consumed in the production of 7.5 moles of MgCl₂?

• 3.8 moles

• 15 moles

• 7.5 moles

• 23 moles

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

What is a Limiting Reagent?

• speeds up a reaction
• what you run out of first
• what you have left over
• slows down a reaction

What is the first thing you must do to solve a stoichiometry problem?

• Write a Balanced Equation
• Panic
• Write an Unbalanced Equation
• Ask for help