A herd of sheep moves up the mountain to graze during summer, and migrates to the valley during winter. What type of migration d
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The question is incomplete, the complete question is:
When 177. g of alanine are dissolved in 800.0 g of a certain mystery liquid X, the freezing point of the solution is
lower than the freezing point of pure X. On the other hand, when 177.0 g of potassium bromide are dissolved in the same mass of X, the freezing point of the solution is
lower than the freezing point of pure X. Calculate the van't Hoff factor for potassium bromide in X.
<u>Answer:</u> The van't Hoff factor for potassium bromide in X is 1.63
<u>Explanation:</u>
Depression in the freezing point is defined as the difference between the freezing point of the pure solvent and the freezing point of the solution.
The expression for the calculation of depression in freezing point is:
OR
......(1)
- <u>When alanine is dissolved in mystery liquid X:</u>
i = Vant Hoff factor = 1 (for non-electrolytes)
= freezing point depression constant
= Given mass of solute (alanine) = 177. g
= Molar mass of solute (alanine) = 89 g/mol
= Mass of solvent = 800.0 g
Putting values in equation 1, we get:
- <u>When KBr is dissolved in mystery liquid X:</u>
i = Vant Hoff factor = ?
= freezing point depression constant =
= Given mass of solute (KBr) = 177. g
= Molar mass of solute (KBr) = 119 g/mol
= Mass of solvent = 800.0 g
Putting values in equation 1, we get:
Hence, the van't Hoff factor for potassium bromide in X is 1.63
This is an incomplete question, here is a complete question.
Hydrogen chloride and oxygen react to form water and chlorine, like this:
Use this chemical equation to answer the questions in the table below.
Suppose 155. mmol of HCl and 38.8 mmol of O₂ are added to an empty flask. How much HCl will be in the flask at equilibrium?
(1) None.
(2) Some, but less than 155. mmol,
(3) 155. mmol,
(4) More than 155. mmol,
Answer : The correct option is, (1) None
Explanation :
The given balanced chemical reaction is:
From the balanced chemical reaction, we conclude that
As, 4 mmole of HCl react with 1 mmoles of
So, 155. mmole of HCl react with mmoles of
That means, is excess reagent and
is a limiting reagent. All the moles of HCl will consume.
Hence, the correct option is, None.