Chemistry, 02.08.2019 06:30 leem6

Toluene, c6h5ch3, is a liquid compound similar to benzene, c6h6. it is the starting material for other substances, including trinitrotoluene (tnt). find the molality of toluene in a solution that contains 35.6 g of toluene and 125 g of benzene.

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Answer from: nathang444

3.08 m

Explanation:

To calculate the molarity, you have to use the following formula:

$\frac{moles of solute}{kg of solvent}$

From the question, we already have the mass of the solvent (benzene); However, for the calculation of molality, we require the solvent in Kg, therefore we do the conversion from g to kg:

125 g of benzene = 0.125 kg of benzene.

To obtain the number of moles of solute we have to use the molecular weight of toluene, which is 92.14

To convert from g to moles, we divide the grams of toluene by the molecular weight:

$\frac{35.6g}{92.14gmol^{-1} }$

Therefore, we have 0.386 moles of toluene.

The last step will be to replace all the values in the molality formula:

$\frac{0.386 moles of toluene}{0.125 kg of benzene}$ = 3.08 m

I hope this clarifies your inquiry.

Answer from: Quest

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –

6.022

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,

will have a gram-molecular weight of 352g.

Answer from: Quest

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .

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Toluene, c6h5ch3, is a liquid compound similar to benzene, c6h6. it is the starting material for oth...

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