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Mass-Mass Problems. Solving Stoichiometry Problems. Major categories of stoichiometry problems are: 1.) mass -mass problems 2.) mass- volume problems 3.) volume -volume problems. Types of Stoichiometry Problems. STOICHIOMETRY. MASS A VOLUME A.

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Solving Stoichiometry Problems

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Mass mass problems l.jpg

Mass-Mass Problems

Solving Stoichiometry Problems


Types of stoichiometry problems l.jpg

Major categories of stoichiometry problems are:

1.) mass-mass problems

2.) mass-volume problems

3.) volume-volume problems

Types of Stoichiometry Problems


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STOICHIOMETRY

MASS A VOLUME A

MASS B VOLUME B

MOL “A”

MOL “B”


Solving mass mass problems l.jpg

In a mass-mass problem, you are given the mass

of one substance and are asked to find the mass

of another substance.

STEP 1:

Convert the given mass to moles using molar mass

of given.

Given mass of substance “A” ÷ molar mass of substance “A” = Mol “A”

Solving Mass-Mass Problems


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STEP 2:

Determine the number of moles for the

unknown by using molar ratio of the

coefficients in the balanced equation.

Mol “A” x molar ratio “B” = Mol “B”

“A”


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STEP 3:

Convert the number of moles for the unknown

into grams using molar mass of the unknown.

Mol “B” x molar mass of unknown = Mass “B”


Example l.jpg

The average person drinks 2 L of water each day, yet

eliminates about 2.5 L. Where do you think the

extra water comes from? It is produced when food

is metabolized in the body. Metabolism is the sum

of all the chemical reactions that occur in the body.

In one series of reactions, glucose (C6H12O6) is

burned in oxygen to produce carbon dioxide and

water. What mass of water is produced from 1.5 g

of glucose? The balanced equation for this reaction

is: C6H12O6 + 6O2  6CO2 + 6H2O

EXAMPLE


Calculate the molar mass of the given substance c 6 h 12 o 6 l.jpg

Molar mass: C = 6 x 12 = 72

C6H12O6 H = 12 x 1 = 12

O = 6 x 16 = 96

180 g/mol

Calculate the molar mass of the given substance: C6H12O6


Convert grams of glucose c 6 h 12 o 6 to moles of water h 2 o l.jpg

0.0083 molC6H12O6 x 6 H2O = 0.050 molH2O

1 C6H12O6

Convert grams of glucose (C6H12O6) to moles of water (H2O).

1.5 g C6H12O6

180 g/mol C6H12O6


Calculate molar mass of unknown substance h 2 o l.jpg

Molar mass: H = 2 x 1 = 2

H2O O = 1 x 16 = 16

18g/mol

Calculate molar mass of unknown substance: H2O


Convert moles of water h 2 o to grams of water h 2 o l.jpg

0.090 g H2O

0.050mol x 18g/mol

Convert moles of water (H2O) to grams of water (H2O).


Practice problems l.jpg

1. In a thermite reaction, powdered aluminum

reacts with iron (III) oxide to produce aluminum

oxide and molten iron. What mass of aluminum

oxide is produced when 2.3 g of aluminum

reacts with iron (III) oxide? The balanced

equation is: 2Al + Fe2O3 2Fe + Al2O3

Practice Problems


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2. Determine the mass of sodium hydroxide

produced when 0.25g of sodium reacts with

water according to the following equation:

2Na + 2H2O  2NaOH + H2


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3. What mass of bromine (Br2) is produced when fluorine reacts with 1.72 g of potassium bromide. The balanced equation is: 2F + 2KBr  2KF + Br2


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