Chemistry, 03.01.2020 20:31 emokid7822

Astudent dissolves 20.0 g of glucose into 511 ml of water at 25 c the vapor pressure of pure water at 25 c is 3.13

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Answer from: heids17043

3.12 × 10⁻² atm

Explanation:

A student dissolves 20.0 g of glucose into 511 mL of water. At 25 °C, the vapor pressure of pure water at 25 C is 3.13 × 10⁻² atm. I think the question is: "What is the vapor pressure of the solution?"

According to Raoult's law, the vapor pressure of a solvent above a solution is equal to the vapor pressure of the pure solvent times the mole fraction of the solvent present.

$P_{solution}=P\°_{solvent}X_{solvent}$

The molar mass of glucose is 180.16 g/mol. The moles corresponding to 20.0 g of glucose are:

20.0 g × (1 mol/180.16 g) = 0.111 mol

The density of water at 25°C is 0.997 g/mL. The mass corresponding to 511 mL of water is:

511 mL × (0.997 g/mL) = 509 g

The molar mass of water is 18.02 g/mol. The moles corresponding to 509 g of water are:

509 g × (1 mol/18.02 g) = 28.2 mol

The total number of moles is 0.111 mol + 28.2 mol = 28.3 mol

The mole fraction of water is:

$X_{solvent}=\frac{28.2mol}{28.3mol} =0.996$

The vapor pressure of a solvent above the solution is:

$P_{solution}=3.13 \times 10^{-2} atm \times 0.996 = 3.12 \times 10^{-2} atm$

Answer from: Quest

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

Answer from: Quest

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.

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Astudent dissolves 20.0 g of glucose into 511 ml of water at 25 c the vapor pressure of pure water a...

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