To understand the mole concept and Avogadro's umber. To learn to covert among moles, mass, and number of atoms in a given sample.
The mole can be defined as the number equal to the number of carbon atoms in 12.01 grams of carbon. Techniques for counting atoms very precisely have been used to determine this number to be 6.022 x 10^23. This number is called Avogadro's number. One mole os something consists of 6.022 x 10^23 eggs.
1. In 26.98 g of aluminum, there are _________ aluminum atoms present.
2. In 78.20 g of potassium, there are _________ potassium atoms present.
3. What mass or iron contains the same number of atoms as 14.01 g of nitrogen?
4. What mass of cobalt contains the same number of atoms as 57.0 g of fluorine?
5. If an average aluminum atom has the mass 4.480 X 10^-23 g, what is the average mass of a boron atom in grams?
6. Calculate the average mass in grams of 1 atom of oxygen
7. Which has the smaller mass, 1 mol of He atoms or 4 mol of H atoms?
8. Which weighs more, 0.50 mol of oxygen atoms or 4 mol oh hydrogen atoms?