question_answer 56)

  Raunak took 5 moles of carbon atoms in a container and Krish also took 5 moles of sodium atoms in another container of same weight. (a) Whose container is heavier? (b) Whose container has more number of atoms?

Answer:

  (a) 1 mole = molar mass of a substance. mole of carbon atoms weigh =12g 5 moles of carbon atoms will weigh =12 x 5 = 60 g Hence, Raunak's container has weigh = 60 g In the same way, mole of sodium atoms weigh =23 g 5 moles of sodium atoms will weigh = 23 x 5 = 115 g Hence,    Krish's container has weigh =115g Thus, Krish's container is heavier than Raunak's container. As,               1 mole = 6.022 x 1023 atoms (b) Here, both containers have 5 moles of each carbon and sodium, therefore, both containers have equal number of atoms, i.e., 5 x 6.022 x 10 atoms. or                    3.011 x 1024 atoms in each.