%X=100% -58,79%= 41,21%
Ta có : \(\frac{X_2}{32}\)=\(\frac{58,79}{41,21}\)= X2.41,21=32.58,79
=> 82,42X= 1881,28
=> X= 23( Na : Natri)
PTK(Na2S)= 23.2+32= 46+32= 78 (đvC)
CT: X2S. Trong đó: 2X/32 = 58,79/41,21 ---> X = 23 (Na: Natri), KH: 1123Na
PTK: = 23.2 + 32 = 78 (đvC)