The atomic number actually represents the number of
electrons in the atom. So when the atomic number is 24 and the actual number of
electron is only 22, so this means that there is a deficit of 2 electrons.
Hence the charge must be positive 2.
Answer:
2+
To compare the results when the independent variable is not involved
Answer:
The mass of iron needed to react with the oxygen is 70 g.
Explanation:
The balanced chemical reaction between iron and oxygen is given as;
4Fe + 3O₂ ----------> 2Fe₂O₃
Molecular mass of 3O₂: 3(16 x 2) = 96 g
Molecular mass of 4Fe: 4(56) = 224 g
96 g of O₂ ---requires--------> 224 g of Fe
30 g of O₂ -------requires--------->? Fe
= (30 x 224) / 96
= 70 g
Therefore, the mass of iron needed to react with the oxygen is 70 g.