To solve this problem we will rely on the theorems announced by Newton and Coulomb about the Gravitational Force and the Electrostatic Force respectively.
In the case of the Force of gravity we have to,
Here,
G = Gravitational Universal Constant
= Mass of Proton
= Mass of Electron
d = Distance between them.
In the case of the Electric Force we have,
k = Coulomb's constant
= Charge of proton
= Charge of electron
d = Distance between them
Therefore
We can here prove that the statement is True
Answer:
78g
Explanation:
Given parameters:
Mass of oxygen gas = 16g
Mass of potassium oxide = 94g
Unknown:
Mass of reacting potassium = ?
Solution:
To solve this problem, we need to obtain a balanced reaction equation. Then determine the number of moles of the reactant and use it to find that of the other one.
Balanced equation:
4K + O₂ → 2K₂O
Number of moles of reacting oxygen;
Number of moles =
molar mass of O₂ = 2 x 16 = 32g/mole
Number of moles = = 0.5mole
From the reaction equation;
4 mole of K reacted with 1 mole of O₂;
x mole of K will react with 0.5 mole of O₂
Therefore, 4 x 0.5 = 2 moles of potassium.
Mass of potassium = number of moles x molar mass
Molar mass of potassium = 39g
Mass of potassium = 2 x 39 = 78g