Answer:
If 3.4 moles of carbon dioxide (CO2) form at the end of the reaction, 1.7 moles of oxygen gas
(02) and 3.4 moles of carbon monoxide (CO) entered the reaction
Explanation:
The rule of three or is a way of solving problems of proportionality between three known
values and an unknown value, establishing a relationship of proportionality between all of
them. That is, what is intended with it is to find the fourth term of a proportion knowing the
other three. Remember that proportionality is a constant relationship or ratio between different
magnitudes.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so
does the other (or when one magnitude decreases, so does the other), the direct rule of three
must be applied. To solve a direct rule of three, the following formula must be followed:
ab
cx
So
C*b
T =
a
In this case, it is possible to use the reaction stoichiometry of the reaction (that is, the
relationship between the amount of reagents and products in a chemical reaction) and the rule
of three to calculate the quantities of moles requested:
.
,
If by stoichiometry 2 moles of CO2 are formed by 1 mol of O2, if 3.4 moles of CO2 are
formed, how many moles of O2 are needed?
molesofo2 = 3.42
=
moles of O2=1.7 moles
• If by stoichiometry 2 moles of CO2 are formed by 2 moles of CO, if 3.4 moles of CO2 are
formed, how many moles of CO are needed?
molesof CO =
=
3.4*2
2
moles of CO=3.4
