Stoichiometry

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

Tags

NGSS.HS-PS1-7

2H₂  +   O₂  →  2H₂O
How many moles of oxygen are consumed if 8 moles H₂ are used?

• 2
• 4
• 6
• 8

Tags

NGSS.HS-PS1-7

How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely to produce KCl and O₂?

• 6.7 mol

• 1.0 mol

• 10.1 mol

• 4.5 mol

Fe (s) + S (l) --> FeS (s)  

In the experiment above, 7.62 g of Fe are allowed to react with 8.67 g of S.
How much FeS is formed?

• 14.8 g
• 12.2 g
• 13.7 g
• 19.9 g

Tags

NGSS.HS-PS1-7

Na + H₂O → NaOH+ H₂

How many grams of hydrogen are produced if 120 g of Na are available? Check the equation first!

• 5.2 g

• 2.6 g

• 690 g

• 45 g

How many moles of carbon dioxide are produced from the combustion of 110 g of CH₄?

• 13.7 mol

• 2.75 mol

• 6.11 mol

• 6.85 mol

For the reaction: Mg + Fe₂O₃ → MgO + Fe; What is the Ratio of moles of MgO to moles Fe?

• 3mol Mg / 2 mol Fe

• 2 mol Mg/ 3 mol Fe

• 1 mol Fe/ 2 mol Fe

• 3 mol MgO / 2 mol Fe

B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O

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

• 13.8 g O₂

• 3.86 mol of O₂

• 125.2 g O₂

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

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

Tags

NGSS.HS-PS1-7

How many moles of aluminum would be needed to completely react with 45 grams of oxygen to produce aluminum oxide?

• 1.05 moles

• 3.75 moles

• 0.875 grams

• 1.875 moles