Giải giúp mình với ạ

$\text{1,}$

$\text{PTK = 2 . X = 71 đvC → X = 35,5 đvC}$

$\text{X : Clo - Cl}$

$\text{2,}$

$\text{PTK = 2 . X + 16 . 5 = 142 đvC → X = 31 đvC}$

$\text{X : Photpho - P}$

$\text{3,}$

$\text{PTK = X + 4 = 16 → X = 12 đvC}$

$\text{X : Cacbon - C}$

$\text{4,}$

$\text{PTK = 2 + X + 16 . 3 = 82 đvC → X = 32 đvC}$

$\text{X : Lưu huỳnh - S}$

$\text{5,}$

$\text{PTK = X + 16 . 2 + 2 = 58 đvC → X = 24 đvC}$

$\text{X : Magie - Mg}$

$\text{6,}$

$\text{PTK = 2 . X + 1 + 31 + 16 . 4 = 176 đvC → X = 40đvC}$

$\text{X : Canxi - Ca}$

$\text{7,}$

$\text{PTK = X + 16 = 81 đvC → X = 65 đvC}$

$\text{X : Kẽm - Zn}$

$\text{8,}$

$\text{PTK = 2 . X + 16 . 3 = 102 đvC → X = 27 đvC}$

$\text{X : Nhôm - Al}$

$\text{9,}$

$\text{PTK = 56 + 3 . X + 16 . 9 = 242 đvC → X = 14 đvC}$

$\text{X : Nito - N}$

$\text{10,}$

$\text{PTK = 2 . X + 16 = 62 đvC → X = 23 đvC}$

$\text{X : Natri - Na}$

$\text{11,}$

$\text{PTK = X + 16 . 2 = 44 đvC → X = 12 đvC}$

$\text{X : Cacbon - C}$

$\text{12,}$

$\text{PTK = 3 . X + 31 + 16 . 4 = 419 đvC → X = 108 đvC}$

$\text{X : Bạc - Ag}$

$\text{13,}$

$\text{PTK = 14 . 2 + 8 . X + 12 + 16 . 3 = 96 đvC → X = 1 đvC}$

$\text{X : Hidro - H}$

$\text{14,}$

$\text{PTK = X + 16 = 80 đvC → X = 64 đvC}$

$\text{X : Đồng - Cu}$

$\text{15,}$

$\text{PTK = 23 . 2 + X + 16 . 2 = 143 đvC → X = 65 đvC}$

$\text{X : Kẽm - Zn}$

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