Answer:
7.41 × 10⁻⁵
Explanation:
Let's consider the basic dissociation reaction of trimethylamine (CH₃)N).
(CH₃)N + H₂O = (CH₃)NH⁺ + OH⁻
According to Brönsted-Lowry, in this reaction (CH₃)N is a base and (CH₃)NH⁺ is its conjugate acid. The pKb for (CH₃)N is 9.87. We can calculate the pKa of (CH₃)NH⁺ using the following expression.
pKa + pKb = 14
pKa = 14 - pKb = 14 - 9.87 = 4.13
Then, we can calculate the acid dissociation constant for (CH₃)NH⁺ using the following expression.
pKa = -log Ka
Ka = antilog - pKa = antilog -4.13 = 7.41 × 10⁻⁵
A. [Ar] 3d¹ 4s²
B. Cesium [Xe] 6s1
C. [Ar] 4s² 3d¹⁰ 4p⁵
D. [He] 2s² 2p⁴
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Answer:
left to right across a period when it decreases and when it increases top to bottom in a group,
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Answer:
Explanation:
Since the <em>gas mixture</em> is <em>ideal</em>, the <em>composition</em> by <em>volume</em> is equal to the composition by moles.
Thus, the mole composition is:
Use a basis of 100 moles and find the mass of each gas, using its corresponding molar masss:
- N₂: 30 moles × 28g/mol = 840 g
- O₂: 30 moles × 16g/mol = 480 g
- H₂: 40 moles × 2g/mol = 80 g
Total mass = 840g + 480g + 80g = 1,400g
Then, the mass fraction of oxgygen is the mass of oxygen divided by the total mass of the gas mixture:
Which in percentage is 34.29%.
Rounded to the nearest integer that is 34% ← answer
Genetic diversity :
1. It is related to number of genes and their alleles found in organisms.
2. It is trait of the species.
3. It influences adaptability and distribution of a species in diverse habitats.
Example :
Humans have created distinct breeds of dogs within the species by selectively breeding individuals with traits that they want. The genetic variability within these breeds is decreased because their effective population size is limited by humans controlling their access to mates.
Species Diversity:
1. It is related to number and distribution of species found in an area.
2. It is trait of the community.
3. It influences biotic interactions and stability of the community.
Example :
the presence of four or five different species of tree in a woodland forest, or perhaps 100 different species of fish, crustaceans and coral in a certain reef.
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