<span>a pure substance that can be separated into different elements by chemical means</span>
It is an element. Aluminun foil is aluminum prepared in thin leaves.
<span>If the concentration of H⁺ ions will decrease then the concentration of OH⁺ ions will increase.</span>
Answer : The amount of oxygen gas collected are, 0.217 mol
Explanation :
Using ideal gas equation :

where,
P = pressure of gas =
(1 atm = 760 torr)
V = volume of gas = 5 L
T = temperature of gas = 
n = number of moles of gas = ?
R = gas constant = 0.0821 L.atm/mol.K
Now put all the given values in the ideal gas equation, we get:


Thus, the amount of oxygen gas collected are, 0.217 mol
Explanation:
<h3>Electrical energy into heat energy..</h3>
<h2>hope it helps.</h2><h2>stay safe healthy and happy...</h2>