question_answer

  Calculate the number of particles in each of the following: (a) 46 g of Na atom     (b) 8 g of  molecules (c) 0.1 moles of carbon atom  

Answer:

                  (a) No. of moles of sodium We know that one mole of sodium contains 6.022X 1023 atoms. 2 moles of sodium contain = 2 x 6.022 x 1023 atoms                                    = 1.204 x1024 atoms (b) 1 mole of oxygen = 32 g 32      of  contains 6.022 x 1023 molecules 8 g ot  contains molecules                     = 3.011 x 1023 molecules (c) 1 mole of carbon atoms contains 6.022 X 1023 atoms 0.1 mole of carbon atoms contains = 6.022 x 1023 x 0.1 = 6.022 x 1022 atoms of carbon