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Cards (20)
What is the first step to calculate percent composition?
Determine the
molar
mass
of the entire compound.
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How do you determine the molar mass of a compound?
By adding up the
atomic
masses
of all the atoms in the compound using the periodic table.
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What is the second step in calculating percent composition?
Calculate the
mass
of each element.
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How do you calculate the mass of each element in a compound?
By
multiplying
the number of atoms of each element by its atomic mass.
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What is the third step in calculating percent composition?
Calculate
percent
composition.
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What is the fourth step in calculating percent composition?
Ensure that the sum of all the percentages is
100
% (or very close, due to
rounding
).
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What are the steps to calculate the empirical formula?
1. Obtain the
masses
of each element (assume 100 g if given percentages).
2. Convert masses to
moles
using
atomic
masses.
3. Determine the simplest whole-number
ratio
by dividing by the smallest number of moles.
4. Write the empirical formula using whole-number ratios as
subscripts.
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What is the first step to calculate the empirical formula?
Obtain the
masses
of each element.
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How do you convert masses to moles in the empirical formula calculation?
By using the
atomic
mass
of each element from the periodic table.
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What is the third step in calculating the empirical formula?
Determine the
simplest
whole-number
ratio.
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How do you determine the simplest whole-number ratio in the empirical formula calculation?
By
dividing
the moles of each element by the
smallest
number of moles calculated.
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What is the fourth step in calculating the empirical formula?
Write
the empirical formula.
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How do you write the empirical formula?
By using the whole-number ratios as
subscripts
in the formula.
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What are the steps to calculate the molecular formula?
1. Determine the
empirical formula.
2. Calculate the
empirical formula mass.
3. Determine the
molar mass
of the compound.
4. Find the
ratio
of the
molar mass
to the
empirical
formula
mass.
5.
Multiply
the empirical
formula
by the
ratio
to get the
molecular formula.
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What is the first step to calculate the molecular formula?
Determine the
empirical
formula.
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How do you calculate the empirical formula mass?
By
adding
up the atomic masses of all atoms in the empirical formula.
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What is the third step in calculating the molecular formula?
Determine the
molar
mass
of the compound.
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How do you find the ratio of the molar mass to the empirical formula mass?
By
dividing
the molar mass by the empirical formula mass.
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What is the fifth step in calculating the molecular formula?
Multiply
the empirical formula by the ratio.
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What is the result of multiplying the empirical formula by the ratio?
The result is the
molecular formula.
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