How many ions are in a mole of chloride, Cl- ?

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Presentation transcript:

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. CO2 H2O Al H2

CO2 molecule H2O molecule Al atom H2 molecule

How many conversions would you use if the given was atoms and the find was grams?

2

What is the mass of 1 atom of calcium?

40.08amu