7 is atomic symbol 9 is atomic density 8 is the atomic number
Iron filings can be attracted by the magnet whereas salt can not. So the mixture can be separated by a magnet
From the equation;
4 Al + 3 O2 = 2 Al2O3
The mole ratio of Oxygen is to Aluminium hydroxide is 3:2.
Therefore; moles of Al2O3 is
(0.5/3 )× 2 = 0.333 moles
Therefore; The moles of aluminium oxide will be 0.333 moles
Ice because the molecules have less movement in solids
Wave speed = frequency x wavelength
= 100 x 0.3
= 30 m/s.
Hope this helps!
