ce cantitate de oxigen se găsește în 196 grame de acid sulfuric? va rog urgent dau coroana

Răspuns :

196 g H2SO4                        Se calcul. masa moleculara a H2SO4
                                              M=2+32+6.16=98                    
g O
                                       98 g H2SO4 ------------64 g O
                                       196 g H2SO4-------------XgO
                                      X=196.64:98=128 g O