Question

Giúp mình câu 6,7 nha , huhu

Answer 1

6.

\(\%O=\dfrac{16n}{102}\cdot100\%=47.06\%\)

\(\Rightarrow n=3\)

\(M_X=2R+16\cdot3=102\left(đvc\right)\)

\(\Rightarrow R=27\)

\(R:Nhôm\)

\(Al_2O_3\)

Answer 2

7.

\(CT:Cu_xO_y\)

\(M_{oxit}=\dfrac{160}{2}=80\left(\dfrac{g}{mol}\right)\)

\(\Rightarrow64x+16y=80\)

\(\Rightarrow x=y=1\)

\(CT:CuO\)

 

Answer 3

8.

\(CT:R_2O_3\)

\(M_X=32\cdot5=160\left(\dfrac{g}{mol}\right)\)

\(\Rightarrow2R+16\cdot3=160\)

\(\Rightarrow R=56\)

\(CT:Fe_2O_3\)