CHEMISTRY HIGH SCHOOL

What is the vapor pressure of the pure solvent if the vapor pressure of a solution of 10 g of sucrose (C6H12O6) in 100 g of ethanol (C2H6O) is 55 mmHg?

Answers

Answer 1

Answer:

Answer:

56.4 mmHg

Explanation:

Given:

Vapor pressure of the solution, P solution = 55 mmHg

The mass of sucrose (C₆H₁₂O₆) = 10 g

Also, Molar mass of sucrose (C₆H₁₂O₆) = 180 g/mol

So, moles = Given mass/ molar mass

Hence, moles of sucrose in the solution = 10 g / 180 g/mol = 0.05556 mol

Given that: Mass of ethanol = 100 g

Molar mass of ethanol = 46 g/mol

Hence, moles of ethanol = 100 g / 46 g/mol = 2.174 mol

Mole fraction of solvent, ethanol is:

X ethanol = 2.174 mol / (2.174 + 0.05556) mol = 0.975

Applying Raoult's Law

P solution = X ethanol*P° ethanol

=> P° ethanol = P solution / X ethanol = 55 mmHg / 0.975 = 56.4 mm Hg

Answer 2

Answer:

Explanation:

The given data is as follows.

Vapor pressure of the solution $(P_(solution))$ = 55 mm Hg

Mass of sucrose = 10 g

Molar mass of sucrose = 180 g/mol

Therefore, moles of sucrose present into the solution will be calculated as follows.

No. of moles = $(mass)/(molar mass)$

= $(10 g)/(180 g/mol)$

= 0.055 mol

Mass of ethanol is given as 100 g and its molar mass is 46 g/mol.

Hence, number of moles of ethanol will be calculated as follows.

No. of moles = $(mass)/(molar mass)$

= $(100 g)/(46 g)$

= 2.174 mol

As mole fraction = $(no. of moles)/(total number of moles)$

Hence, mole fraction of etahnol will be calculated as follows.

$X_(ethanol)$ = $(no. of moles)/(total number of moles)$

= $(2.174)/(2.174 + 0.055)$

= 0.975

Now, using Raoult's Law as follows.

$P_(solution) = X_(ethanol) * P_(ethanol)$

$P_(ethanol)$ = $(P_(solution))/(X_(ethanol))$

= $\frac{55 mm Hg}}{0.975}}$

= 56.4 mm Hg

Thus, we can conclude that the vapor pressure of the pure solvent is 56.4 mm Hg.

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B. less than
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Answers

C greater than because anthing basic is 8 or up

Calcium reacts with water. This reaction is represented by the balanced equation below. The aqueous product of this reaction can be heated to evaporate the water, leaving a white solid, Ca(OH)2(s).Ca(s) + H2O(l) ==> Ca(OH)2(aq) + H2(g)

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State one change in reaction conditions that will increase the rate of the reaction.

Answers

Answer:

- Calcium is more conductive than calcium hydroxide.

- Calcium hydroxide.

- Addition of more either calcium or water to the reaction vessel

Explanation:

Hello,

In this case, based on the given reaction and information, calcium's electrical conductivity 0.298 106/(cm*Ω) which is a relatively high value compared to it its base has due to its large insolubility.

In addition, the name of the formed base is calcium hydroxide based on the IUPAC rules.

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Best regards.

The aqueous product conducts electricity while the solid does not. Ionic solids do not conduct electricity, but ions dissolved in solution do.The chemical name of the base is calcium hydroxide.Increasing the temperature of the system would increase the rate of the reaction.

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Answers

Answer:

C. manufacturing

Explanation:

With the Independence of the Thirteen Colonies in 1776, the colonies became independent states, but united in a Federation, with republican and presidential political representation. States in the northern region concentrated on the development of industry and, to that end, needed free and salaried labor to operate the work within the factories. Prior to the secession war, the northern states had 80 percent of manufacturing capacity in the United States. The formation of the working class and the industrial bourgeoisie in the North has also produced a specific way of looking at political activity and civil rights.

The North had 80% of the manufacturing capacity in the U.S. before the Civil War. The North was filled with factories, whereas the South relied on farming and slaves to survive, they produced a lot of cotton and tobacco for example. During the Civil War as you could imagine, the North was making a lot of artillery, so its economy began to expand more to meet the demands of war.

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Answers

A change that one can see with the eye. Such as a new hairstyle or a growth over the years.

Hello there!

Explanation:

↓↓↓↓↓↓↓↓↓↓↓

Physical Change is a substance it does not change. Arrangement of molecules changes.

Solid
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Hope this helps!

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-Charlie

HELP ASAPFor the reaction 2H2(g) + S2(g)<---> 2H2S(g), determine the equilibrium constant at 700oC if at this temperature, the equilibrium concentrations are as follows:
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Answers

Equilibrium constant of a reaction is the ratio of concentrations of the products and the reactants when the reaction is in equilibrium. This value is independent of the concentrations since the conditions are at equilibrium instead it depends on ionic strength and temperature.

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Answers

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