All categories

2 years ago

1.20g of methyl alcohol, CH3OH, are dissolved in 16.8g of water, H2O. What is the mole fraction of the solute?

Chemistry

2 answers:

kolezko [41]2 years ago

7 0

Answer:

0.0386

Explanation:

To make a solution, we need a certain amount of the solute to be dissolved in the solvent. The solvent is the carrier medium usually water in traditional wet chemistry.

Now, in this particular question, it should be known that methyl alcohol is the solute, while water is the solvent.

We need to calculate the mole fraction of the solute as asked by the question. Now what we do is to find the number of moles of each, add together, then divide the number of moles of methyl alcohol by the sum of the moles of both.

Firstly, we calculate the number of moles of methyl alcohol present. This is mathematically equal to dividing mass by molar mass

Molar mass of methyl alcohol (CH3OH) is 12 + 4(1) + 16 = 32g/mol

The number of moles is thus 1.2/32 = 0.0375 moles

Now, we calculate the number of moles of water. The molar mass of water is 18g/mol

The number of moles of water is thus 16.8/18 = 0.93333

The mole fraction of the solute is thus:

0.0375/(0.0375 + 0.9333) = 0.0386

andreyandreev [35.5K]2 years ago

5 0

Answer:

The mole fraction of the solute, methyl alcohol, is 0.0387

Explanation:

Step 1: Data given

Mass of methyl alcohol = 1.20 grams

Molar mass of methyl alchol = 32.04 g/mol

Mass of water = 16.8 grams

Molar mass of water = 18.02 g/mol

Step 2: Calculate number of moles of methyl alcohol

Number of moles methyl alcohol = Mass / molar mass

Number of moles methyl alcohol = 1.20 grams / 32.04 grams

Number of moles methyl alcohol = 0.0375 moles

Step 3: Calculate number of moles of water

Moles H2O = 16.8 grams / 18.02 g/mol

Moles H20 = 0.932 moles

Step 4: Calculate total number of moles

Total number of moles = moles CH3OH + moles H2O = 0.0375 moles + 0.932 moles = 0.9695 moles

Step 5: Calculate mole fraction of the solute

Solute = methyl alchol

(Solvent = water)

Mole fraction = 0.0375 moles / 0.9695 moles

Mole fraction = 0.0387

The mole fraction of the solute, methyl alcohol, is 0.0387

You might be interested in

Amino acids are the building blocks of proteins. The simplest amino acid is glycine (H2NCH2COOH). Draw a Lewis structure for gly

VashaNatasha [74]

Answer:

Explanation:

The lewis structure (indicating all the atoms and patterns provided as hint in the question) of glycine can be seen in the attachment below. While the chemical structure of glycine can be seen below

H₂N - C - C =O

| \

H OH

The structure (of glycine) above provides a "fair idea" of how the lewis structure will be.

3 0

1 year ago

Repulsion of electrons within two interacting molecules produces changes in electron distribution. This change in electron distr

ycow [4]

Answer:

Explanation:

This explains how two noble gases molecules can have an attractive force between them.

This force is called as van dar Waals forces.

It plays a fundamental role in fields in as diverse as supramolecular chemistry structural biology .

If no other forces are present, the point at which the force becomes repulsive rather than attractive as two atoms near one another is called the van der Waals contact distance. This results from the electron clouds of two atoms unfavorably coming into contact.[1] It can be shown that van der Waals forces are of the same origin as the Casimir effect, arising from quantum interactions with the zero-point field.[2] The resulting van der Waals forces can be attractive or repulsive.[3] It is also sometimes used loosely as a synonym for the totality of intermolecular forces.[4] The term includes the force between permanent dipoles (Keesom force), the force between a permanent dipole and a corresponding induced dipole (Debye force), and the force between instantaneously induced dipoles

6 0

1 year ago

In some chemical reactions, electrons are transferred from one substance to another, but there is no net gain or loss of electro

Natali [406]

Answer and Explanation:

The equation that depicts oxidation of neutral atom A is shown below:

$\rightarrow A^+ + e^-$

This is because one species is losing electrons due to oxidation. The species possesses positively charged after losing electrons, the magnitude of which is proportional to the number of electrons lost.

The net charge will be equivalent on both sides of the equation, too.

Therefore all other options are not correct

The equation that depicts the decline of neutral atom X is

$X + e^- \rightarrow X^-$

It is how a cell gains electrons by reduction. The species obtains a negative charge upon possessing electrons, whose magnitude is equivalent to the amount of electrons gained.

The net charge will be equivalent on both sides of the equation, too.

Therefore all other options are not correct

4 0

2 years ago

A double-replacement reaction takes place when aqueous k2so4 reacts with aqueous pb(no3)2. you would expect the products of this

SpyIntel [72]

A double replacement is when the reactants switch with their opposite charge. For example, AB + CD = AD + BC.

In this case the given is K2SO4 + Pb(NO3)2 = ____ + ____

The answers is PbSO4 and KNO3 would expect the products of this reaction.

8 0

2 years ago

Read 2 more answers

As photosynthesis occurs in chloroplasts, O2 is produced from _____ via a series of reactions associated with _____. View Availa

Monica [59]

Answer:

H₂O, Photosystem II

Explanation:

Photosynthesis is the process that enables autotrophs such as green plants and algae to generate food using water, carbon dioxide and energy from the sun.
It occurs in two phases, that is, the light-dependent phase and the light-independent phase.
During photosystem II energy from the sun is used to break-down water molecules to yield oxygen and hydrogen ions. Oxygen is released away to the atmosphere while hydrogen ions are used in the next phase to generate ATP molecules.

6 0

2 years ago