ng system holds 5.60 gal, what is the boiling point of the solution? For the calculation, assume that at normal filling conditions, the densities of engine coolant and water are 1.11 g/mL and 0.998 g/mL respectively. Also, assume that the engine coolant is pure ethylene glycol ( HOCH 2 CH 2 OH ) , which is non‑ionizing and non‑volatile, and that the pressure remains constant at 1.00 atm. The boiling‑point elevation constant for water will also be needed.
You are watching: A 50/50 blend of engine coolant and water
the capacity of the cooling car system = 5.6 gal
volume of solute = volume of the water; since a 50/50 blend of engine coolant and water (by volume) is used.
Afterwards, the mass of the solute and the mass of the water can be determined as shown below:
mass of solute =
On the other hand; the mass of water =
= 17.757 m
≅ 17.76 m
∴ the boiling point of the solution is calculated using the boiling‑point elevation constant for water and the Molarity.
= 0.512 °C/m
= 100°C + 17.56 × 0.512
= 109.09 °C
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In a colligative properties experiment, a lab group prepares four solutions and one pure solvent sample. What is the purpose of
The pure solvent sample will serve as the control for the experiment. The properties of a solution are different from the properties of the pure substance or the pure solvents. For instance, if water and salt are mixed together to form salt solution, the properties of the water and that of the salt are different from that of the salt solution. Colligative properties refers to the properties of solutions which depend on the ratio of the number of solute particles to the number of solvent molecules in a solution; the properties do not depend on the chemical species that are present.
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At a certain temperature the vapor pressure of pure heptane is measured to be . Suppose a solution is prepared by mixing of hept
This is an incomplete question, here is a complete question.
At a certain temperature the vapor pressure of pure heptane is measured to be 170 torr. Suppose a solution is prepared by mixing 86.7 g of heptane and 125 g of acetyl bromide.
Calculate the partial pressure of heptane above this solution. Round your occupychristmas.org to 3 significant digits.
occupychristmas.org : The partial pressure of heptane is, 78.2 torr
Explanation : Given,
Mass of heptane = 86.7 g
Mass of acetyl bromide = 125 g
Molar mass of heptane = 100 g/mole
Molar mass of acetyl bromide = 122.9 g/mole
First we have to calculate the moles of heptane and acetyl bromide.
Now we have to calculate the mole fraction of heptane and acetyl bromide.
Now we have to partial pressure of heptane.
= partial pressure of heptane
= total pressure of gas
= mole fraction of heptane
Therefore, the partial pressure of heptane is, 78.2 torr
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4. Arrange the following substances in order of increasing boiling point: CH3CH2OH, HOCH2CH2OH, CH3CH2Cl , and ClCH2CH2OH A. CH3
occupychristmas.org: Option (B) is the correct occupychristmas.org.
A molecules that will have more number of hydrogen bonding will has highest boiling point because to break the hydrogen bonds high heat needs to be provided.
So, in the molecule
there is presence of two alcoholic groups. Hence, it will have strongest hydrogen bonding as compared to the rest of molecules.
In the molecule
there will be hydrogen bonding and dipole-dipole interactions. Hence, it boiling point will be slightly less than
In the molecule
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In the molecule
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Therefore, we can conclude that increasing order of boiling point will be as follows.
Condensation reaction/ direct synthesis reaction
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