mass
amount
molar mass
concentration
solution volume
gas volume
molar gas volume
Avogadro
constant, L
number of
entities, N
H3. AMOUNTS RATIOS & OBTAINING THE SOICHIOMETRIC FACTOR
Amount-amount ratios assume a place of central importance in solving stoichiometry problems since they generate the required stoichiometric factor(s). The sources for these ratios are usually the coefficients (or stoichiometric coefficients) of a chemical equation,
i.e., the large-font numbers immediately preceding written formulae.
H3.1 WRITING AMOUNT–AMOUNT RATIOS MATHEMATICALLY - 1
Try to complete the expressions above which are missing their RHS.
You may have noticed that in setting up these expressions, the amount we are required
to obtain is usually placed as the LHS numerator at the outset. For many this makes the subsequent algebra more user-friendly.
There now follow some problems which deal with these key ideas about amounts ratios and the interpretation of stoichiometric coefficients.
In the teaching, understanding and learning of such a crucial sub-topic, this is an area which generally receives too little attention, and - not uncommonly - confusion ensues from here.