Additional Questions

  1. What is the weight of 1 x 1020 gold atoms?
  2. 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?
  3. How many atoms are there in 25 g of I2?
  4. Suppose that Dalton had proposed that all atoms have the same size, weight, and other characteristics.
    1. How many elements would there be?

      0,1,2, none of these

    2. How many compounds would there be?

      0,1,2, none of these

  5. 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?
  6. How many neutrons and protons are in the nucleus of the most common isotope of Mg?
  7. Elemental lithium exists as two isotopes. Give the mass number of each and then calculate the percentage of each.
  8. How many 37Cl atoms are there in 1.0 g of chlorine?
  9. A compound contains 40% carbon and 60% hydrogen.
    1. How many moles of carbon are there in a 20 g sample?
    2. How many atoms of hydrogen are there in a 1.0 g sample?
  10. An alloy contains 70% copper and 30% zinc. What is the ratio of copper atoms to zinc atoms?