8. The % composition of a …

8.   The   % composition  of a   substance  is  P =32.63 ,  0 =16.82   &    S =  50.55.  The  V.D  of substance is  190.  Find  the  molecular  formula  of the substance . 9     A welding  fuel gas  contains C  and  H  only.  Burning  a  small  sample of it  in O2  gives  3.38g  of  CO2  ,  .690g  of  H2O  and  no other  product .  A   volume    of     10 L (measured  at  N.T.P )  of  this  welding   gas  is  found  to weighs  11.6g.  Calculate    (i)  empirical  formula  (ii)  molecular mass  (iii) molecular  formula  of the  welding gas   ? 10   (i)    1.15g  of metallic  Na  react  with  excess  of water  .  How  many  moles  of  H2  are formed   and  what  volume  of H2  is   formed at  S.T.P ?   (II)    How  many  moles  of  Pb(NO3)2  are required  to  produce  48 g  of  O2 ?    (III)  Calculate  amount  of  KCLO3  needed  to  supply  sufficient  O2  for  the  burning  of  112L  of  CO2 at N.T.P  ?

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