Which of the following is not a base? A: NH3 B. NaOH C. H3C6H5O7 D. KOH
2 answers:
Answer: Option (C) is the correct answer.
Explanation:
A base is a substance or specie that contains a lone pair of electron or a hydroxyl group, that is, OH group.
For example, , NaOH, and KOH are all bases.
But is not a base because there is no lone pair of electron and no hydroxyl group.
Thus, we can conclude that out of the given options is not a base.
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Total vapor pressure can be calculated using partial vapor pressures and mole fraction as follows:
Here, is mole fraction of A,
is mole fraction of B,
is partial pressure of A and
is partial pressure of B.
The mole fraction of A and B are related to each other as follows:
In this problem, A is hexane and B is octane, mole fraction of hexane is given 0.580 thus, mole fraction of octane can be calculated as follows:
Partial pressure of hexane and octane is given 183 mmHg and 59.2 mmHg respectively.
Now, vapor pressure can be calculated as follows:
Putting the values,
Therefore, total vapor pressure over the solution of hexane and octane is 131 mmHg.