The electronegativity increases as you move from left to right across a period
Answer:
The pH of the solution at the half‑equivalence point is 4,14
Explanation:
The acid dissociation of this monoprotic acid is:
HA ⇄ H⁺ + A⁻; ka = 7,3x10⁻⁵
ka is defined as:
ka = [A⁻] [H⁺] / [HA] <em>(1)</em>
When HA is titrated with NaOH the reaction is:
HA + NaOH → A⁻ + Na⁺ + H₂O
At half-equivalence point, 0,52/2 moles of HA remains while 0,52/2 A⁻ moles are produced.
Replacing this values in (1):
![7,3x10^{-5} =\frac{ [0,52/2] [H^+]}{[0,52/2]}](https://tex.z-dn.net/?f=7%2C3x10%5E%7B-5%7D%20%3D%5Cfrac%7B%20%5B0%2C52%2F2%5D%20%5BH%5E%2B%5D%7D%7B%5B0%2C52%2F2%5D%7D)
7,3x10⁻⁵ = [H⁺]
As pH = -log [H⁺]
<em>pH = 4,14</em>
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I hope it helps!
Answer:
B. They are clones of the parent plant
Explanation:
Answer:
ΔH(mix'g)= 42.3Kj/mole
Explanation:
ΔH = (mcΔT)water/moles X
m = mass(g) = 20ml x 1.00g/ml = 20 g
c = 4.184 j/g⁰C
ΔT = 25°C- 15°C = 10°C
moles X = (1.5g)/(76g/mole) = 0.0197 mole X
ΔH = (20g)(4.184j/g°C)(10°C)/(0.0197 mole X) = 42,300J/mole = 42.3Kj/mole (3 sig.figs.)
Answer:
Electron microscopes differ from light microscopes in that they produce an image of a specimen by using a beam of electrons rather than a beam of light. Electrons have much a shorter wavelength than visible light, and this allows electron microscopes to produce higher-resolution images than standard light microscopes.
Explanation: