Complete the following table for aqueous solutions of caffeine, C8H10O2N4.

Find:
Molality
Mass Percent Solvent
Ppm Solute

Given:
Mole Fraction Solvent = 0.900

Molar Mass is 194.2g i believe.

two acids solutions are mixed. One is 26% acid the other is 34% acid. Which one. Of the following concentrations cannot possibly be the concentration of the mixture? A. 36% B. 28% C. 30% D. 31%

Complete the table for aqueous solutions of caffeine C8H10O2N4.

a. given: mole fraction solven:0.900 find molality, mass percent solvent, Ppm solute

To complete the table, we need additional information:

1. Molality (m):
Molality is defined as the number of moles of solute per kilogram of solvent. We need to know the mass of the solvent to calculate the molality.

2. Mass Percent Solvent (%):
Mass percent solvent is the percentage of the total mass that is the solvent. To calculate this, we need the mass of the solvent and the total mass of the solution.

3. Ppm Solute:
Parts per million (ppm) is a unit used to express very small concentrations. It represents the number of parts of solute per million parts of solution. To calculate this, we need the mass of the solute and the total mass of the solution.

Without the mass of the solvent or the total mass of the solution, we cannot complete the table.

To complete the table for aqueous solutions of caffeine, we need to calculate the following values: molality, mass percent solvent, and ppm solute.

1. Molality (m):
Molality is defined as moles of solute per kilogram of solvent. To calculate molality, we need to know the number of moles of solute and the mass of the solvent in kilograms.

Given: Mole Fraction Solvent = 0.900 (This means the mole fraction of solute is 0.100 since the sum of mole fractions must equal 1)

To find the moles of solute, we can use the molar mass of caffeine, which is given as 194.2 g/mol:
Moles of Caffeine = Mole Fraction Solute × Total moles of solvent (1 mole of solute + mole fraction of solvent)
Moles of Caffeine = 0.100 × (1 mole + 0.900 mole)
Moles of Caffeine = 0.100 × 1.900 mole
Moles of Caffeine = 0.190 mole

Next, we need to find the mass of the solvent. Let's assume we have 1 kg (1000 g) of water as the solvent.

Mass of Solvent = 1000 g

Now we can calculate the molality:
Molality (m) = Moles of Solute / Mass of Solvent (in kg)
Molality (m) = 0.190 mole / 1 kg
Molality (m) = 0.190 mol/kg

So, the molality of the aqueous solution of caffeine is 0.190 mol/kg.

2. Mass Percent Solvent:
Mass percent is defined as the mass of the solvent divided by the mass of the solution, multiplied by 100%.

Given: Mole Fraction Solvent = 0.900

To find the mass of the solute, we can multiply the moles of caffeine by its molar mass:
Mass of Caffeine = Moles of Caffeine × Molar Mass
Mass of Caffeine = 0.190 mole × 194.2 g/mol
Mass of Caffeine = 36.922 g

Now we can calculate the mass percent of the solvent:
Mass Percent Solvent = (Mass of Solvent / (Mass of Solvent + Mass of Solute)) × 100%
Mass Percent Solvent = (1000 g / (1000 g + 36.922 g)) × 100%
Mass Percent Solvent = (1000 g / 1036.922 g) × 100%
Mass Percent Solvent ≈ 96.46%

So, the mass percent of the solvent in the aqueous solution of caffeine is approximately 96.46%.

3. Ppm Solute:
Ppm (parts per million) is a unit used to describe very small concentrations. It represents the mass of solute in one million parts of the solution.

Given: Molar Mass of Caffeine = 194.2 g/mol

To find the ppm of the solute, we will use the following formula:
Ppm Solute = (Mass of Solute / Mass of Solution) × 10^6

First, we need to find the total mass of the solution (solute + solvent):
Mass of Solution = Mass of Solute + Mass of Solvent
Mass of Solution = 36.922 g + 1000 g
Mass of Solution = 1036.922 g

Now we can calculate the ppm of the solute:
Ppm Solute = (36.922 g / 1036.922 g) × 10^6
Ppm Solute ≈ 35,622 ppm

So, the concentration of the solute in parts per million (ppm) in the aqueous solution of caffeine is approximately 35,622 ppm.