Stiochiometry (mol to mol)

Given the reaction:

4Al + 3O₂ --> 2Al₂O₃

How many moles of Aluminum oxide, Al₂O₃, can you produce if you have 2 moles of Al?

• 3 mole

• 2 mole

• 1 mole

• 0.5 mole

N₂ + 3 H₂ → 2 NH₃

How many moles of NH₃ will be formed from 1 mole of H₂?

• 4 moles

• 2/3 moles

• 3/2 moles

• 6 moles

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe; What is the Ratio of moles of Mg 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

Tags

NGSS.HS-PS1-7

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

Ethane (C₂H₆) combusts in the above reaction. What is the mole ratio of ethane to oxygen gas?

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• 
• 
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S₈ + 12 O₂ → 8 SO₃

How many moles of S₈ is needed to produce 12 moles of SO₃?

• 1

• 1.5

• 2

• 12

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

• 2
• 4
• 6
• 8

Aluminum will react with sulfuric acid in the following reaction:

2 Al_(s) + 3 H₂SO_4(l) → Al₂(SO₄)_3(aq) + 3 H_2(g)

_{If you're given a mass for aluminum and asked to solve for mass of hydrogen which is the correct mole ratio to use?}

• 2/3

• 3/2

What is a mole ratio?

• An animal that burrows underground.

• How many moles of reactant are used up in a chemical reaction.

• The ratio of a reactant / product to a different one - compared by the number of particles.

• The process by which we multiply fractions by using numbers from a chemistry problem.

Tags

NGSS.HS-PS1-7

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

KNO₃ --> KNO₂ + O₂
What coefficients are needed to balance the reaction?

• 2, 2, 1
• 2, 3, 2
• 1, 2, 2
• 1, 3, 1