Solving Stoichiometry Problems

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# Solving Stoichiometry Problems - PowerPoint PPT Presentation

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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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

MASS B VOLUME B

MOL “A”

MOL “B”

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

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”

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”

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

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

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

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