0.1M HCl [H⁺]=0.1=10⁻¹ pH= - log 10⁻¹ = 1, pH = 1
0.001M HCl [H⁺]=0.001=10⁻³ pH= - log 10⁻³ = 3, pH = 3
0.00001M HCl [H⁺]=0.00001=10⁻⁵ pH= - log 10⁻⁵ = 5, pH = 5
Distilled water pH=7
0.00001 NaOH [OH⁻]=10⁻⁵, [OH⁻][H⁺]=10⁻¹⁴, [H⁺]=10⁻¹⁴/10⁻⁵=10⁻⁹,
pH=9
0.001 NaOH [OH⁻]=10⁻³, [OH⁻][H⁺]=10⁻¹⁴, [H⁺]=10⁻¹⁴/10⁻³=10⁻¹¹,
pH=11
0.1 NaOH [OH⁻]=10⁻¹, [OH⁻][H⁺]=10⁻¹⁴, [H⁺]=10⁻¹⁴/10⁻¹=10⁻¹³,
pH=13
Salt is a chemical compound formed for the reaction of an acid with a base.
Answer:
Average atomic mass = 3.9 amu
Explanation:
Given data:
Percent abundance of He-2 = 0.420%
Percent abundance of He-3 = 2.75%
Percent abundance of He-4 = 96.83%
Average atomic mass = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100
Average atomic mass = (0.420×2)+(2.75×3) +(96.83×4)/100
Average atomic mass = 0.84 + 8.25 +387.32 / 100
Average atomic mass = 396.41 / 100
Average atomic mass = 3.9 amu.
<h2>O sistema nervoso do corpo é formado pelo cérebro, pela medula espinhal, pela retina e por muitos outros nervos.</h2><h2> O sistema circulatório é constituído pelo coração, artérias, veias e capilares. </h2>
Answer:
The mass of oxygen is 12.10 g.
Explanation:
The decomposition reaction of potassium chlorate is the following:
2KClO₃(s) → 2KCl(s) + 3O₂(g)
We need to find the number of moles of KClO₃:
Where:
m: is the mass = 30.86 g
M: is the molar mass = 122.55 g/mol
Now, we can find the number of moles of O₂ knowing that the ratio between KClO₃ and O₂ is 2:3
Finally, the mass of O₂ is:
Therefore, the mass of oxygen is 12.10 g.
I hope it helps you!
