The Mole, Quiz 1

1) How do you convert 3*1018 atoms to moles?

a) 3*1018 / 6.022E23
b) 3*1018 * 6.022E23
c) 6.022E23 / 3*1018
d) none of these

2) From the periodic table, the mass of Neon is listed as 20. What does this mean?

a) One atom of Neon has a mass of 20 grams
b) 20 Neon atoms are equal to one mole
c) One mole of Neon has a mass of 20 grams
d) One neon atom has a mass of 20 moles

3) If I had 5 moles of H2O, then I would have ___ moles of H and ___ moles of O.

a) 5, 1
b) 1, 5
c) 5, 10
d) 10, 5

4) Give one way that the mole is similar to other units, like the dozen.

 

5) If I have 25g of Helium (with a mole mass of 4g), then how many atoms do I have?

a) (25 * 6.022E23) / 4
b) (25 * 4) / 6.022E23
c) (4 * 6.022E23) / 25
d) 25 * 6.022E23 * 4