Mr(C3H8) = 12∙3 + 1∙8 = 44
Mr(Cu2S) = 64∙2 + 32∙1 =160
Mr(NH3) = 14∙1 + 1∙3 = 17
Mr(MgO) = 24∙1 + 16∙1 = 40
Mr(C3H8) = 12∙3 + 1∙8 = 44
Mr(Cu2S) = 64∙2 + 32∙1 =160
Mr(NH3) = 14∙1 + 1∙3 = 17
Mr(MgO) = 24∙1 + 16∙1 = 40