Stoichiometry (IB Chem Chapter 1) Cheat Sheet
by Maryam.Razvi via cheatography.com/181035/cs/37643/
Formulas
How to Find the Limiting Reagent
Ideal Gas vs. Real Gas
No. of molecules =
No. of moles (n) =
Step 1: Write down the whole equation
Ideal Gas
Real Gas
n [no. of moles] x A
Mass (m)/ Molar
[Avoga​dro's
Mass (Mr)
Step 2: Balance the entire equation
Obeys all gas
All properties change
Step 3: Using the balanced equation,
laws
determine the coeffi​cient ratio of the
No forces of
reactants
attraction
Step 4: Write down the ratios of the values
Collide in straight
Collision in random
given in the question
lines
motion
Step 5: Convert the amounts to moles
No mass or volume
Step 6: divide the values (mole ratio / coeffi​‐
High Temper​ature
Low Temper​ature
cient ratio)
Low Pressure
High Pressure
Ans: The smallest value is the limiting
High Volume
Low Volume
Constant]
No. of Atoms = No.
No. of moles (n) =
of Molecules [n x A]
Volume (dm3) /
x Atomicity
Molar volume (STP
or RTP)
% yield = [Exper​‐
C [molarity] = no. of
imental yield/
moles [n]/ Volume of
Theore​tical Yield] x
concen​tration [v]
100
Ideal Gas Law - PV
Volume​/co​nce​ntr​‐
= nRT
ation constant C1V1 = C2V2
reagent
Forces of attraction
Steps to Find a Standard Solution
Ideal Gas Law
Standard Solution : a solution of accurately
PV = nRT; where
known concen​tration
Finding Percentage Yield of a Reaction
P - Pressure (Pa)
Step 1: Weigh a known amount of solute
Note: % yield always applies on
V = Volume (m3)
Step 2: Dissolve the Solute in a minimal
T - Temper​ature (K) *Take celsius value
amount of water
and + 273
Step 3: Transfer the solution to a volumetric
R - Constant (8.31 JK/mol)
flask without washing
n - no. of moles (mol)
Step 4: Make the solution fill the flask till the
PRODUCTS
1: In any situation, first determine which of
the products is the limiting reagent
2: Using the compound which is limiting,
form a ration such that [limiting reactant :
product]
meniscus reaches accurate value
Molar Volume Values
3: Under the ratio, write the coeffi​cient ratio
of reactant : product
4: Add the molar mass OF 1 MOLE
5: Multiply the Molar mass with the number
of moles = mass value
6: Cross multiply to find the THEORE​TICAL
YIELD
Step 5: Place stopper and invert into mix
STP - Standard
RTP - Room
Temper​ature and
Temper​ature and
Pressure
Pressure
Temp.: 0 degrees
Temp.: 20 degrees
Celsius
Celsius
Pressure: 1 atm
Pressure = approx.
solution
1atm
7: Use the mass of the product given in the
question - (EXPER​IMENTAL YIELD)
Volume: 22.7 dm3
Volume: 24 dm3
8: Substitute in the formula: [Exper​imental
Yield/ Theore​tical Yield] x 100 to find %
yield
By Maryam.Razvi
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Last updated 12th March, 2023.
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