Chapter 9 Stoichiometry Review Problems Cac2+h2o=c2h2+caoh2

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Proper noun _______

CHAPTER 9 – STOICHIOMETERY

STOICHIOMETERY- The study of the amount of a substances consumed and produced in chemic reactions.

The science of reactions is basically like cooking. You must mix the right proportion of each ingredient (reactant) to obtain the best results (products).

The "recipe" for a chemical reaction is the balanced equation.

For Example: 2 H_ii + O_two → 2H₂O

This can be read as ii hydrogen molecules mix with one oxygen molecule

to produce two h2o molecules.

or

ii moles of H_two mix with 1 mole of O_two to make 2 moles of H_iiO

Example:

___KClO_iii → ____KCl + ____O_two

mole ratio step

____moles of KClO₃ yields ____ moles of KCl and ____ moles of O₂.

You lot will utilise these coefficients (mole ratios) to determine how much you will demand to mix together or how much you lot tin can produce.

Example of Mole/Mole problems:

1) How many moles of O_ii will 9.5 moles of KClO_three produce?

To solve this problem, we volition use the T-bar and add a mole ratio step. The mole ratio allows you to convert from one substance to another. They are the whole number coefficients that yous use to residue the equations.

given mole ratio

ix.v moles KClO₃ 3 moles of O_{2____ =}
14.25 moles O_two

2 moles of KClO₃

Effort these two on your own:

one) If you want to produce 15.0 moles of O₂, how many moles of KClO₃ should you first with?

2). If xviii.2 moles of O₂ are produced, how many moles of KCl are produced with it?

The real key to stoichiometry is to obtain numbers we can use in the lab. So, instead of moles, we will want our answers in grams. This requires a conversion from moles to grams using the gfm. ( remember: i mole = gfm (gram formula mass )

In that location are four basic stoichiometry reactions. Let'southward name them and write the formulas:

ane) mole to mole

2) mole to mass

3) mass to moles

four) mass to mass

Now that we have to four basic types of stoichiometery formulas, lets practice.

CaC2 + 2 H2o → C2H2 + Ca(OH)2

Moles-mass problems:

1) How many grams of water are required to produce 1.55 moles of C_iiH₂?

2) How many grams of C_iiH₂ are produced when 5.0 moles of CaC₂ reacts completely?

Mass-moles problems:

1) How many moles of h2o are needed to react with 20.5 chiliad of CaC₂?

ii) How many moles of Ca(OH)_iiare produced with 29.0 1000 of C₂H₂?

3) How many moles of CaC₂ will produce 15.0 thou of Ca(OH)₂?

The final pace in stoichiometry is to start with grams and to end with grams. This manner you know what yous are going to produce in lab, or how much of each reactant you need to mix.

4 Na + O₂ → two Na_iiO

one). How many grams of O₂ are required to react completely with 14.vi g of Na to class Na₂O?

2). How many grams of Na₂O are produced when 20.0 g Na reacts completely?

3). How many grams of Na are needed to produce 200.0 thousand of Na₂O?

Mole – mole conversions

____CaC_two + ____ H_iiO → ____C₂H₂ + ____ Ca(OH)₂

1) How many moles of water are needed to react with two.five moles of CaC₂?

2) How many moles of C2H2 are produced when 9.5 moles of CaC_two are mixed with backlog water?

___________________________________________________________________________

____Na + ____ O₂ → ____Na₂O

3) How many moles of Na are needed to produce 0.25 moles of Na_iiO?

4) How many moles of O_twowill react with 9.4 moles of Na to produce Na₂O?

five) Calculate the number of moles of Na2O that will be produced when 5.0 moles of Na completely react with oxygen gas?

___C_twoH₆ + ____O₂ → ____ CO₂+ ____H₂O

6) How many moles of carbon dioxide are produced when 5.8 moles of C2H6 react completely with oxygen?

7) How many moles of O₂ are needed to react completely with 18.0 moles of CO₂?

eight) How many moles of C₂H_vi are needed to produce 14.0 moles CO₂?

ix) If nine.8 moles of CO₂ are produced, how many moles of water are also produced?

Gram-mole, Mole –gram conversions

____C₂H_{half dozen} + ____O₂ → ____CO_two + ____H₂O

1) How many grams of CO₂ are produced when you apply eight.0 moles of C_iiH₆?

2) If 8.0 moles of CO₂ are produced in this reaction, how many grams of O₂ accept been used?

3) 45.0 grams of C_iiH₆ volition react with oxygen to produce ______ moles of h2o?

____Cu + ____AgNO_iii → ____Cu(NO₃)_two + ____Ag

four) How many moles of AgNO_iiiare needed to react with 170.0 m of Cu?

5) In a reaction, viii.v moles Ag are produced. How many grams of Cu were used up in the reaction?

_________________________________________________________________________________

____NH₃ + ____NO → ____N_ii + ____H₂O

6) If four.five moles of water are produced, how many grams of NH₃ must you beginning with?

7) How many moles of NO are needed to react with 48.0 g NH_three?

8) If 9.viii grand of North_two are produced, how many moles of water are as well produced?

9) How many moles are NH₃ volition produce 15.0 m of N_two?

Gram-Gram conversions

___Li_threeN + ____H_twoO → ____NH₃ + ____LiOH

i) What mass of water is needed to react with 98.7 thousand of lithium nitride?

2) How many grams of ammonia will be formed if 36.0 yard Li₃N reacts completely with water?

____SiO_ii + ____C → ____SiC + ____CO

iii) How many grams of SiO_ii are needed to react with 45.0 g of C?

four) If 19.0 of C are used, how many grams of SiC can be produced?

____NH₄NO₃ → ____N_ii + _____O_ii + ____H_twoO

five) How many grams of water are produced when 45.half dozen g of ammonium nitrate decomposes?

vi) If 15.5 grams of O2 are formed, how many grams of NH₄NO₃ must have decomposed?

7) If 87.5 grand of N₂are produced, how many grams of water are too produced?