Question

200g var nestins reactioneaza cu apa si se obtin 148 g var stins .Care a fost puritatea varului nestins ?

Answer 1

       xg                  148g
       Ca O +H2O =Ca(OH)2                                                                                                        56g                    74g
MCaO=40 +16=56------->1mol=56 g                                              MCa(OH)2=40+2.16+2=74------->1mol=74g                                                                           x=56.148:74=112g CaO                                                                              puritatea=p=mp.100:mt                                                                                                    p=112.100:200=56 la suta