The s orbital is the closest orbital to the atom and contains the leasy number of electrons. Did i help?
Answer: D
Explanation:
They form from Coal under high high pressure and many many years
C.<span>Wave A will have a louder sound than wave B
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Answer:
pKa = 3.72
Explanation:
Let's consider the dissociation of a generic monoprotic weak acid.
HA(aq) ⇄ H⁺(aq) + A⁻(aq)
For a weak acid, we can find the value of the acid dissociation constant (Ka) using the following expression:
where,
[H⁺] is the molar concentration of H⁺
Ca is the initial concentration of the acid
First, we need to find [H⁺] from pH.
pH = -log [H⁺]
[H⁺] = antilog -pH = antilog -2.40 = 3.98 × 10⁻³ M
Then,
Finally,
pKa = -log Ka = -log 1.89 × 10⁻⁴ = 3.72
From the Avogadro's law one mole of a substance contains 6.022× 10^23 particles.
Therefore; 1 mole of water contains 6.022 × 10^23 molecules
Hence 1.7 moles will contain;
1.7 × 6.022 × 10^23 molecules
= 10.2374 × 10^23 molecules
= 1.024 ×10^24 molecules
≈ 1.02 × 10^24 molecules