Stoichiomet

Stoichiometry

by Lilia Villalba

Be sure that you know:

Molar Volume

The Mol

Balance of equation

Conversion Factor

Limiting reactant

Nomenclature

Molar Mass

Excess reactant

CONVERSION FACTORS

1. Moles to grams and viceversa MOLAR MASS (From PT)2. Moles to molecules if it is a compound, moles to atoms if it is an element and viceversa AVOGADRO´S NUMBER (6.022X1023) 3. Moles to L if it is a GAS at STP MOLAR VOLUME (22.4L) 4. Atoms to molecules and viceversa FORMULA SUBSCRIPT 5.- Mol to Mol of other substance... Stoichiometric Coefficient (balance)

Problems to start: ONE SUSTANCE Single stoichiometry

1. How many moles will be if you have 2.3X1024 silver atoms? 2. How many oxygen atoms are there in 122 molecules of Copper (II) Nitrate: CuNO3? 3.How many molecules are in 230 grams of CoCl2

In summary, the steps to follow to solve reaction stoichiometry problems are the following:

Mol to Mol

Using reactions

Potassium chlorate (KClO3) is obtained by the reaction of chlorine (Cl2) and a solution of potassium hydroxide (KOH) also potassium chloride (KCl) and water (H2O) are produced in the reaction. Calculate the amount of potassium chlorate, in moles, obtained by reacting 10 mol of potassium hydroxide with the sufficient amount of chlorine. Calculate the amount of chlorine, in mol, that reacts completely with 5 mol of potassium hydroxide.

Stoichiometry mass to mass

Balance the reaction Convert the amount of grams of A into moles of A Convert the moles of A into moles of B using the molar ratios from the BALANCED chemical reaction Convert the moles of B into grams of B

Tutorials

Stoichiometry Map

When you´ve finally balanced that equation

Using reactions II

Mass to mass

Glucose (C6H12O6) reacts with oxygen (O2) to form carbon dioxide (CO2) and water vapor (H2O). How much mass of oxygen (in grams) does it take to react with 25 grams of glucose? How many grams of carbon dioxide and water will be formed?

C6H12O6 + 6O2 --> 6CO2 + 6H2O

You start with the 25 g of glucose for all the other calculations...

Limiting reactant, Excess reactant and Percent yield

Video

+ Exercises

Tutorials

Using reactions III

Limiting reagent

Molecular hydrogen (H2) reacts with molecular oxygen (O2) to form water. If 40 g of hydrogen react with 40 g of oxygen, will all the masses of the reagents be consumed? Who is the limiting reagent?

Video

MASS STOICHIOMETRY

+ info

More Problems

Keep working you will get it very soon!

https://en.intl.chemicalaid.com/tools/equationbalancer.php

https://opentextbc.ca/introductorychemistry/chapter/mole-mass-and-mass-mass-calculations/