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Q.4       What is the mass of                                                      3        Av/A
                     (i) 2.5 moles of CO
                                         2
                     (ii) 5moles of water?
           Q.5       Calculate the following                                                  5        D/A
                         a)  Calculate the number of particles present in 56 g of N 2
                            molecule.
                         b)  A sample of ethane (C 2H 6) gas has the same mass as
                                    20
                            1.5X10 molecules of methane (CH 4). How many C 2H 6
                            molecules does the sample of gas contain?
                         c)  What is the mass of 0.5 mole of oxygen gas


               NCERT TEXT BOOK
               Pg No. 42 Q 1. And 2
               Pg No 44 Q.7,8,9,10 and 11.


               Subjective:













































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