Answer:
Concentration of is 0.675 M
Explanation:
According to balanced equation, 2 moles of KOH neutralizes 1 mol of .
18.90 mL of 2.50M KOH = of KOH = 0.04725 moles of KOH
If molarity of is C (M) then-
moles of are neutralized = of
Hence,
or, C = 0.675
So, concentration of is 0.675 M
The answer will be A & B not only because it makes sense but evaporation is taking water away not adding to (gaining)
The answer in this question is FALSE. Hydrogen atom has electronic configuration 1s^1. It needs only one more electron to make a closed sub-shell. Therefore, a stable hydrogen atom does not have an octet but a duplet. Therefore, the statement is false.
The statement 'what stars are made of' is an example of a question that could be answered using cosmological models.
<h3>
What are cosmological models?</h3>
Cosmological models are scientific models to understand the forces that shape the structure of the universe.
The cosmological model answers diverse types of inquiries such as ''what stars are made of' because this model describes the composition of celestial bodies (including stars) in the universe.
The cosmological model can examine different questions about the universe including its composition, structure, evolutionary trajectories, etc.
In conclusion, the statement 'what stars are made of' is an example of a question that could be answered using cosmological models.
Learn more about cosmological models here:
brainly.com/question/14507985
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Correct AnswerFourth Option, 2518 g
Solution:The formula of number of moles (n) in terms of mass of the compound(m) and molar mass of the compound (M) can be stated as:
We have the number of moles of Octane.
So,
n = 22.05 moles
We have the molar mass of octane.
So,
M=114.22 g/mol
Using these values in the above formula we can calculate mass of Octane (m).
Therefore, the mass of 22.05 moles of Octane is 2518 g.