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chem: tell people to ignore uncertainties with moles

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eggy 2021-01-04 17:36:45 -05:00
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@ -224,7 +224,7 @@ A net ionic equation is similar to a total ionic equation but only shows the ion
If there is no reaction, there is no net ionic equation but there is a total ionic equation. If there is no reaction, there is no net ionic equation but there is a total ionic equation.
## 1.2 - The mole concept ## 1.2 - Stoichiometry - the mole concept
A **mole** (mol) is a unit representing $6.02…×10^{23}$ countable objects. A **mole** (mol) is a unit representing $6.02…×10^{23}$ countable objects.
@ -262,6 +262,8 @@ $$\text{Percentage composition} = \frac{\text{mass of element in compound}}{\tex
<img src="/resources/images/percentage-composition-by-mass.jpg" width=700>(Source: Kognity)</img> <img src="/resources/images/percentage-composition-by-mass.jpg" width=700>(Source: Kognity)</img>
When calculating empirical formulae, uncertainties, unless they are large, can be reasonably discarded because they will not affect the final result significantly.
!!! example !!! example
The empirical formula of a compound consisting of 43.64% $\text{P}$ and 56.36% $\text{O}$ by mass: The empirical formula of a compound consisting of 43.64% $\text{P}$ and 56.36% $\text{O}$ by mass:
$m_\text{P} = 43.64\text{ g}$ $m_\text{P} = 43.64\text{ g}$