Answer: -
The experiment Niven is doing is burning of Mg.
The first step would be finding the molar mass of MgO
Atomic mass of Mg = 24 g
Atomic mass of Oxygen = 16 g
Molar mass of MgO = 24 x 1 + 16 x 1 = 40 g
The balanced chemical equation for this reaction is
2 Mg + O2 -- > 2MgO
From the balanced equation we see that
2 Mg gives 2 MgO
2 x24 g of Mg O gives 2 x 40 g of MgO.
28g of MgO gives

= 46.66 g of MgO.
<span>Answer: D. They all have the same number of electrons in the electron cloud</span>
Answer: answer A
Explanation: because it gives more detail and a summarizations
It's formed by the hydrogen ion of the acid and the hydroxide of the base.

Sulfuric Acid + potassium superoxide --> Potassium Sulfate + Heavy Water
Hope this Helps :)
The answers D man have fun