IB Chemistry Topic S1.4.3 Molar Mass Revision Notes (SL/HL)

IB Chemistry Topic S1.4.3 Molar Mass Revision Notes (SL/HL) | RevisionDojo

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What Is Molar Mass?

Definition

Molar mass

Molar mass, denoted as $M$, is the mass of one mole of a substance.

It is expressed in units of grams per mole ($\text{g mol}^{-1}$).
Molar mass is numerically equal to the relative formula mass $M_r$, but unlike the dimensionless $M_r$ it carries the unit $\text{g mol}^{-1}$.
The molar mass tells you how much one mole of a substance weighs in grams.

Example

The molar mass of carbon ($C$) is $12.01 \, \text{g mol}^{-1}$.
- This means 1 mole of carbon atoms weighs $12.01$ grams.
The molar mass of water ($H_2O$) is $18.02 \, \text{g mol}^{-1}$.
- This means 1 mole of water molecules weighs $18.02$ grams.

The Relationship Between Mass, Moles, and Molar Mass

The relationship between mass, moles, and molar mass is captured by the formula: $$n = \frac{m}{M}$$ where:
1. $n$ = number of moles (mol)
2. $m$ = mass of the substance (g)

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What Is Molar Mass?

Definition

Molar mass

Molar mass, denoted as $M$, is the mass of one mole of a substance.

It is expressed in units of grams per mole ($\text{g mol}^{-1}$).
Molar mass is numerically equal to the relative formula mass $M_r$, but unlike the dimensionless $M_r$ it carries the unit $\text{g mol}^{-1}$.
The molar mass tells you how much one mole of a substance weighs in grams.

Example

The molar mass of carbon ($C$) is $12.01 \, \text{g mol}^{-1}$.
- This means 1 mole of carbon atoms weighs $12.01$ grams.
The molar mass of water ($H_2O$) is $18.02 \, \text{g mol}^{-1}$.
- This means 1 mole of water molecules weighs $18.02$ grams.

The Relationship Between Mass, Moles, and Molar Mass

The relationship between mass, moles, and molar mass is captured by the formula: $$n = \frac{m}{M}$$ where:
1. $n$ = number of moles (mol)
2. $m$ = mass of the substance (g)

Definition

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Note

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Structure 1. Models of the particulate nature of matter5 subtopics

Structure 2. Models of bonding and structure4 subtopics

Structure 3. Classification of matter2 subtopics

Reactivity 1. What drives chemical reactions?4 subtopics

Reactivity 2. How much, how fast and how far?3 subtopics

Reactivity 3. What are the mechanisms of chemical change?4 subtopics

IB Chemistry S1.4.3 Molar Mass Notes

Structure 1. Models of the particulate nature of matter5 subtopics

Structure 2. Models of bonding and structure4 subtopics

Structure 3. Classification of matter2 subtopics

Reactivity 1. What drives chemical reactions?4 subtopics

Reactivity 2. How much, how fast and how far?3 subtopics

Reactivity 3. What are the mechanisms of chemical change?4 subtopics

What Is Molar Mass?

The Relationship Between Mass, Moles, and Molar Mass

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What Is Molar Mass?

The Relationship Between Mass, Moles, and Molar Mass

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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