It has to be oxygen as it has a charge of -2 and magnesium has a charge of +2 so when they bond it would be MgO
MgSO₄(aq) + BaCl₂(aq) → MgCl₂(aq) + BaSO₄(s)
Mg²⁺ + SO₄²⁻ + Ba²⁺ + 2Cl⁻ → Mg²⁺ + 2Cl⁻ + BaSO₄
SO₄²⁻ + Ba²⁺ → BaSO₄ (the net ionic equation)
The correct answer is making observations in his experiment.
In his cathode ray tube experiment J. J. Thomson proved that the cathode rays are indeed negatively charged particles. He then went on to calculate charge-to-mass ratio of the electron. J. J. Thomson’s pioneering work lest to the theory that the atomic structure is made up of charged particles.
<span>No of moles of Fe = Mass / Relative molar mass of Fe. So no of moles = 89.4/ 55.845 = 1.60. The. Chemical reaction is represented as follows. 4 Fe + 3 O2 which gives 2Fe2 O3 . This means that 4 atoms of Iron reacts with 3 atoms of Oxygen to produce Iron oxide. Hence 1.60*4 moles of Fe will need to react 1.6 * 3 moles of Oxygen to produce 2 moles of Iron oxide. Hence 4.8 moles of Oxygen will be required.</span>
