How many ions are in a mole of chloride, Cl - ?
Feb 01, 2016
How many ions are in a mole of chloride, Cl-
?
6.022 x 1023 ions= 1mol
What do a mole of chloride ions and a mole of xenon atoms have in
common?
They both have the same amount of particles;6.022 x 1023 particles
Does a mole of Xenon have the same mass as a
mole of chloride ions?
No, according to the periodic table, each
substance has a different mass. They just are the
same number of particles.
What’s the molar mass of chlorine?
35.45g/mol
Turn the previous question and answer
into a conversion factor.
1 mol Cl 35.45g Cl 35.45g Cl or 1 mol Cl
If a test question asked you to calculate average atomic mass what numerical data would have to be given in
the problem?
The mass of the isotopes and the % abundance.
Explain the difference between molecular and
empirical formulas.
The empirical formula is the simplified ratio and the
molecular formula is how the molecule actually exists.
How many significant figures does 700.10 have
in it?
5
Round 367.895 to the hundredths place.
367.90
What is the formula you use to help you determine
a molecular formula?
Molecular mass empirical mass
What is the third step in calculating an empirical
formula?
Divide by small
How can you check your answer in a percent composition
problem to make sure there are no obvious errors?
Make sure the percents add up to 100%.
How can you double check your answer in an average
atomic mass problem?
Make sure the final average in amu is between the
masses given in the problem.
What are the 5 possible units for Avogadro’s
number?
Particles, ions, atoms, molecules, and formula units.
That means whenever you write 6.022 x 1023 you must have one of those units behind it. NOT g or mol.
Tell whether the following is an atom or molecule.a)CO2
b)H2O
c)Ald)H2
a) CO2 molecule
b) H2O molecule
c) Al atomd) H2 molecule
How many conversions would you use if the given was atoms and the find
was grams?
What is the mass of 1 atom of calcium?
40.08amu