Question

Part 1: A sample of silver (Ag) has a mass of 31.78 g.

Answer 1

 Part A

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

 part  B

 The   moles of  silver   is 0.2946  moles

calculation

moles =mass÷  molar   mass

    = 31.78 g  ÷ 107.87 =0.2946 moles

part  c

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