Stoichiometry Review (honors)

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

How many grams of O₂ are needed to react with 100 grams of NH₃?

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

• 941.2 g O₂

• 235.3 g O₂

• 4,000 g O₂

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

In the equation 2Al₂O₃ → 4Al + 3O₂, what is the mole ratio of aluminum to oxygen?

• 10:6

• 3:4

• 4:3

• 2:3

How do you get the mole ratio?

• It's the number of elements in a reaction

• From the coefficients in the balanced chemical equation

• You make it up as you go

• Magic

CH₄ + 2 O₂ → CO₂ + 2 H₂O
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

2H₂ + O₂ → 2H₂O

How many grams of H₂O can be produced from 3.91 g of O₂?

• 1.905

• 4.4

• 2.2

• 1.1

The empirical formula of a substance is CH₂O. The molar mass is 180g/mol. What is the molecular formula?

• CH₂O

• C₃H₆O₃

• C₆H₁₂O₆

• C₁₂H₆O₁₂

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

• Mg₄N₃
• MgN₂
• Mg₃N₂ 
• MgN

What is the percent composition by mass of magnesium in magnesium bromide (MgBr₂)?

• 13%

• 43%

• 63%

• 87%