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3 years ago

A solution is made using 199.7 g of toluene and 80 g of benzene. What is the molality of the tolunene in the solution?

Chemistry

1 answer:

olga nikolaevna [1]3 years ago

6 0

Answer:

The molality of toluene is 7.748 molal

Explanation:

Step 1: Data given

Mass of toluene = 199.7 grams

Mass of benzene = 80.0 gram

Molar mass of benzene = 78.11 g/mol

Molar mass of toluene = 92.14 g/mol

Step 2: Calculate total mass

Total mass = mass of toluene + total benzene

Total mass = 199.7 grams + 80.0 grams

Total mass = 279.7 grams = 0.2797 kg

Step 3: Calculate moles of toluene

Moles toluene = mass toluene / molar mass toluene

Moles toluene = 199.7 grams / 92.14 g/mol

Moles toluene = 2.167 moles

Step 4: Calculate molality of toluene

Molality toluene = moles / mass solution

Molality = 2.167 moles / 0.2797 kg

Molality = 7.748 molal

The molality of toluene is 7.748 molal

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8 0

3 years ago

A sailor on a trans-Pacific solo voyage notices one day that if he puts 375. mL of fresh water into a plastic cup fresh water we

ElenaW [278]

Answer:

Amount of salt dissolved in each liter of seawater = 40 g

Explanation:

According to Archimedes principle, a body will float in a fluid if the upthrust experienced by a body is equal to the to the weight of the body.

Also, the volume of seawater displaced equals the volume of freshwater in the cup.

From the above principle, since the freshwater and cup floats in the seawater, their combined weight equals the upthrust.

Therefore, mass of equal volume of displaced seawater = mass of freshwater + mass of cup

Mass of freshwater = density of freshwater * volume

density of freshwater = 1 g/mL; volume = 375 mL

mass of freshwater = 375 mL * 1 g/mL = 375 g

mass of seawater = 375 + 15 = 390 g

mass of salt in 375 mL seawater = mass of seawater - mass of freshwater

mass of salt = (390 - 375) g = 15 g

Since 15 g of salt are dissolved in 375 mL seawater, mass of salt in 1 L of seawater =(1000 mL/ 375) * 15g = 40 g

Therefore, amount of salt dissolved in each liter of seawater = 40 g

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3 years ago

What would cause the different liquids to have different density

Maksim231197 [3]

The masses of the liquids are different making them have different densities

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3 years ago

What is the mass in milligrams of 4.30 moles of sodium? use significant figures?

alexandr1967 [171]

Answer is: mass <span>of 4,30 moles of sodium</span> is 98800 mg.
n(Na) = 4,30 mol.
m(Na) = ?
m(Na) = n(Na) · M(Na).
m(Na) = 4,30 mol · 23 g/mol.
m(Na) = 98,90 g.
m(Na) = 98,90 g · 1000 mg/1g.
m(Na) = 98900 mg.
n - amount of substance.
m - mass of substance.
M - molar mass of substance.

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When electricity flows through water, the water molecules split into molecules of hydrogen and oxygen gas. How many oxygen (O2)

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