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Understanding Mole Ratios in Chemical Reactions, Study notes of Chemistry
The concept of mole ratios in balanced chemical equations, their derivation from coefficients, and their use in converting moles of one compound to moles of another. Several examples are provided to illustrate the concept.
What you will learn
- What is a mole ratio in a chemical reaction?
- How do coefficients in a balanced chemical equation relate to mole ratios?
- How can mole ratios be used to convert moles of one compound to moles of another in a chemical reaction?
Typology: Study notes
2021/2022
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Mole RatiosMole Ratios
More conversions!More conversions!
Balanced chemical equations show proportions of
chemicals used
Mole Ratio
A ratio between compounds in a chemical
reaction from balanced chemical equation
Comes from COEFFICIENTS! Allows us to convert from moles one compound to moles of a different compound in your balanced equation
Balanced chemical equations show proportions of
chemicals used
Mole Ratio
A ratio between compounds in a chemical
reaction from balanced chemical equation
Comes from COEFFICIENTS! Allows us to convert from moles one compound to moles of a different compound in your balanced equation
Given the following balanced chemical equation, what are some mole ratios we can develop? POCl 3 + 3 H 2 O H 3 PO 4 + 3 HCl 1 mole POCl 3 = 1 mole H 3 PO 4 1 mole POCl 3 = 3 moles HCl 1 mole POCl 3 = 3 moles H 2 O 3 moles H 2 O = 1 mole H 3 PO 4 3 moles H 2 O = 3 moles HCl Given the following balanced chemical equation, what are some mole ratios we can develop? POCl 3 + 3 H 2 O H 3 PO 4 + 3 HCl 1 mole POCl 3 = 1 mole H 3 PO 4 1 mole POCl 3 = 3 moles HCl 1 mole POCl 3 = 3 moles H 2 O 3 moles H 2 O = 1 mole H 3 PO 4 3 moles H 2 O = 3 moles HCl
2 H
2
+ O
2
2 H
2
O
We can set up conversion factors with our mole
ratios:
1 mol O 2 2 mol H 20 2 mol H 2 O 1 mol O 2 So if I ask how many moles of water (H 2 O) are formed if you use 215 moles of oxygen, you can use the conversion factor to determine moles of water. 215 mol O 2 2 mol H 2 O = 430 moles H 2 O 1 mol O 2
2 H
2
+ O
2
2 H
2
O
We can set up conversion factors with our mole
ratios:
1 mol O 2 2 mol H 20 2 mol H 2 O 1 mol O 2 So if I ask how many moles of water (H 2 O) are formed if you use 215 moles of oxygen, you can use the conversion factor to determine moles of water. 215 mol O 2 2 mol H 2 O = 430 moles H 2 O 1 mol O 2
N 2
- 3 H 2 2 NH 3 How many moles of hydrogen (H 2 ) are needed to make 312 moles of ammonia (NH 3 )?
312 moles NH 3 3 moles H 2 = 468 moles H 2
2 moles NH 3
N 2
- 3 H 2 2 NH 3 How many moles of hydrogen (H 2 ) are needed to make 312 moles of ammonia (NH 3 )?
312 moles NH 3 3 moles H 2 = 468 moles H 2
2 moles NH 3
Given the following balanced equation:
Fe
2
O
3
+ 2 Al 2 Fe + Al
2
O
3 If you have 88.72 g Fe 2 O 3, find:
Moles of Al needed
First we must convert our grams to moles of Fe
2
O
3,
88.72 g Fe
2
O
3
1 mole Fe
2
O
3
= 0.556 mol Fe
2
O
3
159.69 g Fe
2
O
3 Given the following balanced equation:
Fe
2
O
3
+ 2 Al 2 Fe + Al
2
O
3 If you have 88.72 g Fe 2 O 3, find:
Moles of Al needed
First we must convert our grams to moles of Fe
2
O
3,
88.72 g Fe
2
O
3
1 mole Fe
2
O
3
= 0.556 mol Fe
2
O
3
159.69 g Fe
2
O
3