Question

unit 2 study guide
instructions
answer the following questions.
introduction to the periodic table

1. mendelev based the periodic table on the elements
2. convert 70 grams of chlorine to moles.
3. convert 2 moles of h₂o to grams.
4. according to avogadro, how many particles are in 1 mole of an element?
5. what is the relative mass of an element based on?

Explanation:

1. Mendeleev arranged elements by atomic mass and similar properties.
2. Use molar mass of Cl (35.45 g/mol) to convert grams to moles.
3. Calculate molar mass of H₂O then multiply by moles.
4. Avogadro's number defines particles per mole.
5. Relative atomic mass is based on carbon-12 standard.

Answer:

1. atomic mass and similar chemical properties
2. ~1.975 moles
3. 36 grams
4. 6.022 × 10²³ particles
5. the mass of a carbon-12 atom (taken as 12 atomic mass units)