Answer:
2.08 moles (3 s.f.)
Explanation:
number of moles
= number of atoms ÷ Avogadro's constant
Avogadro's constant= 6.022 ×10²³
Thus, number of moles
= 1.25×10²⁴ ÷ (6.022 ×10²³)
= 2.08 moles (3 s.f.)
Answer:
2121 K
Explanation:
With the numbers given in the problem, this is the math.
Answer:
The universe exhibits a wide range of explosive phenomena such as Massive stars end their lives with a bright explosion, a "supernova", which outshines the galaxy in which the explosion takes place; Much brighter, and more rare "gamma-ray burst" explosions outshine the entire observed universe for the few seconds they are known as comic blast
Explanation:
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Answer:
The Kₐ of the weak acid is 1.033×10⁻⁴
Explanation:
The dissociation of a weak acid in aqueous solution is limited to about 5 to 10%
The acid dissociation reaction is given as follows;
HA (aq) + H₂O (l) → H₃O⁺(aq) + A⁻ (aq)
Given that the pH = 2.5, we have
pH = -log₁₀[H₃O⁺] = 2.5
∴ [H₃O⁺] = 10^(-2.5) = 0.0031623
![K_a = \dfrac{[H_3O^+][A^-]}{[HA]}](https://tex.z-dn.net/?f=K_a%20%3D%20%5Cdfrac%7B%5BH_3O%5E%2B%5D%5BA%5E-%5D%7D%7B%5BHA%5D%7D)
Kₐ = [H₃O⁺][A⁻]/[HA] = (0.0031623^2)/(0.1 - 0.0031623) = 1.033×10⁻⁴
The acid dissociation constant, Kₐ for weak acid is very low as obtained
A molecule of acetonitrile ch3cn contains 5 sigma bonds and 2 pi bonds.
What is acetonitrile?
Acetonitrile is a nitrile which is hydrogen cyanide where the hydrogen (H) is replaced by a methyl group (-CH 3 ). Acetonitrile is a volatile organic compound. it is also called Cyanomethane.
To know more about acetonitrile go to the given link :
brainly.com/question/14900816
