## Additional Questions

- What is the weight of 1 x 10
^{20}gold atoms? - If you could take one pound of aluminum and divide it into samples that contained one billion atoms each, how many samples would you have?
- How many atoms are there in 25 g of I
_{2}? - Suppose that Dalton had proposed that all atoms have the same size, weight, and other characteristics.
- How many elements would there be?
0,1,2, none of these

- How many compounds would there be?
0,1,2, none of these

- How many elements would there be?
- Assume that a hydrogen atom has diameter of 1 x 10
^{-10}m. If you had a 1 ft high stack of hydrogen atoms, how many hydrogen atoms would you have? - How many neutrons and protons are in the nucleus of the most common isotope of Mg?
- Elemental lithium exists as two isotopes. Give the mass number of each and then calculate the percentage of each.
- How many
^{37}Cl atoms are there in 1.0 g of chlorine? - A compound contains 40% carbon and 60% hydrogen.
- How many moles of carbon are there in a 20 g sample?
- How many atoms of hydrogen are there in a 1.0 g sample?

- An alloy contains 70% copper and 30% zinc. What is the ratio of copper atoms to zinc atoms?