Part 1: a sample of silver (ag) has a mass of 31.78 g. a. what is the molar mass of silver? b. how many moles of silver are in this particular 31.78 g sample? c. how many atoms of silver are in this same sample? show work! you!

 The   molar  mass of   silver = 107.87 g/mol  ( from periodic table)

 The   moles of  silver   is 0.2946  moles

calculation

moles =mass÷  molar   mass

    = 31.78 g  ÷ 107.87 =0.2946 moles

The  number of atoms  of silver  that are  in this sample is 1.773 x 10²³  atoms

  calculation

According  to Avogadro's  law   1  mole  =   6.02 x 10²³  atoms

                                                  0.2946   moles= ? atoms

by  cross  multiplication

= [ (0.2946  moles x 6.02 x 10²³ ) / 1 mole]  = 1.773 x 10²³ atoms

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i  

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

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