Answer: 0.004 moles
Explanation:
Amount of substance= mass/ molar mass
Mass= 250mg or 0.25g
Molar mass= 58.44gmol-1
Amount= 0.25/58.44
= 0.004 moles
Answer:The atom being mostly empty space. A small number of alpha particles were deflected by large angles (> 4°) as they passed through the foil. There is a concentration of positive charge in the atom. Like charges repel, so the positive alpha particles were being repelled by positive charge
2Al +3CuSO4=Al2 (SO4)3+3Cu.
is the balanced equation.
HOPE IT HELPS YOU '_'
In Thomson's experiment, he showed that an electrical current can be made to flow from a positive site to a negative site.