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Kitty [74]
4 years ago
9

What is the freezing point of a solution prepared by dissolving 50.0g of glycerin in 200g of ethanol?

Chemistry
2 answers:
Lostsunrise [7]4 years ago
7 0
When a solute is added to a solvent, some properties are affected and these set of properties are called colligative properties. Freezing point depression calculation is used for this type of problem. Calculations are as follows:

<span>ΔT(freezing point)  = (Kf)m
ΔT(freezing point)  = 1.86 °C kg / mol (50.0/92.09 mol / .200 kg)
ΔT(freezing point)  = 5.04 </span>°C <span>
Tf - T = 5.04 </span>°C <span>
T = -5.04 °C</span>

<span>
</span> 
Serjik [45]4 years ago
4 0

Answer:

-120 °C

Explanation:

The freezing point depression is calculated as follows:

ΔT = Kf*m

where ΔT is the difference between the freezing point of the pure solvent and from the solution; kf is a constant (equal to 2 °C/m for ethanol); and m is the molality of the solution.

moles of solute = (50 g)/(92.09 g/mol) = 0.54 mol

molality of the solution = moles of solute / kg of solvent

molality of the solution = 0.54 mol/ 0.2 kg = 2.7 m

ΔT = 2*2.7 = 5.4 °C

The freezing point of ethanol is -114.6 °C, then the freezing point of the solution is -114.6 °C - 5.4 °C =  -120 °C

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what is the total number of grams of NaOH needed to react completely with 196 grams of H2 SO4? regents
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Answer:

160 g

Explanation:

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

For H_2SO_4:-  

Mass of H_2SO_4 = 196 g

Molar mass of H_2SO_4 = 98 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles= \frac{196\ g}{98\ g/mol}

Moles\ of\ Sulfuric\ acid= 2\ mol

According to the given reaction:

2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O

1 mole of sulfuric acid reacts with 2 moles of NaOH

So,  

2 moles of sulfuric acid reacts with 2*2 moles of NaOH

Moles of NaOH must react = 4 moles

Molar mass of NaOH = 40 g/mol

<u>Mass = Moles*molar mass = 4\times 40\ g = 160 g</u>

3 0
4 years ago
Diethyl malonate reacts with propyl bromide in a three‑step reaction sequence. Identify the product that is formed. The highligh
Crazy boy [7]

The product that is formed is shown in the figure , Option A is the correct answer , and the highlighted carbons shown corresponds to the carbons from diethyl malonate.

<h3>What is a Chemical Reaction ?</h3>

Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products.

Substances are either chemical elements or compounds.

A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

Chemical reactions are an integral part of technology, of culture, and indeed of life itself.

The product that is formed is shown in the figure , Option A is the correct answer , and the highlighted carbons shown corresponds to the carbons from diethyl malonate.

To know more about Chemical Reaction

brainly.com/question/4291209

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8 0
2 years ago
A single atom found on the periodic table is know as an
adelina 88 [10]

Answer:

Element

Explanation:

A chemical element is a substance that contains only one type of atom, which is the smallest particle of an element

3 0
3 years ago
If the density of water is 1.00 g/mL, will an object with a density of 3.4 g/mL sink or float?
miss Akunina [59]

Explanation:

Objects or substances with their density greater than that of water will sink in it whiles those less than water will float on it.

From the question the object has a density of 3.4 g/mL.

Since it's density is greater than that of water the object will sink.

Hope this helps you

8 0
4 years ago
Can we move only one electron from its orbit to another orbit of lower energy without moving other electrons of the atom? well i
Mrac [35]
Yes, it can happen.

If all the lower energy orbits are already filled with electrons, then it cannot happen since the lower orbitals will already be full, hence another electron will have to move.

However, if the lower energy orbits are not full (for instance if one excited electron goes back to its normal state), then it can happen.
4 0
3 years ago
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