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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Major categories of stoichiometry problems are:
1.) mass-mass problems
2.) mass-volume problems
3.) volume-volume problemsTypes of Stoichiometry Problems
MASS A VOLUME A
MASS B VOLUME B
In a mass-mass problem, you are given the mass
of one substance and are asked to find the mass
of another substance.
Convert the given mass to moles using molar mass
Given mass of substance “A” ÷ molar mass of substance “A” = Mol “A”Solving Mass-Mass Problems
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”
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”
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 + 6H2OEXAMPLE
C6H12O6 H = 12 x 1 = 12
O = 6 x 16 = 96
180 g/molCalculate the molar mass of the given substance: C6H12O6
0.0083 molC6H12O6 x 6 H2O = 0.050 molH2O
1 C6H12O6Convert grams of glucose (C6H12O6) to moles of water (H2O).
1.5 g C6H12O6
180 g/mol C6H12O6
H2O O = 1 x 16 = 16
18g/molCalculate molar mass of unknown substance: H2O
0.050mol x 18g/molConvert moles of water (H2O) to grams of water (H2O).
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 + Al2O3Practice Problems
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