a. Ta có: \(PTK_{Na_xPO_4}=23x+31+16.4=164\left(đvC\right)\)
\(\Leftrightarrow x=3\)
b. Ta có: \(M_{M_2SO_4}=NTK_M.2+32+16.4=142\left(đvC\right)\)
\(\Leftrightarrow NTK_M=23\left(đvC\right)\)
Vậy M là natri (Na)
c. Ta có: \(PTK_{Al_2\left(SO_4\right)_x}=27.2+\left(32+16.4\right).x=342\left(đvC\right)\)
\(\Leftrightarrow x=3\)
a, Ta có: 23x + 31 + 16.4 = 164 ⇒ x = 3
b, Ta có: 2MM + 32 + 16.4 = 142 ⇒ MM = 23
Vậy: M là Na.
c, Ta có: 27.2 + 96x = 342 ⇒ x = 3
Bạn tham khảo nhé!