Operating wavelength : 449 nm
Absorbance of solution 1 - Standard Dichromate-H2O : 0.560 a.u.
Absorbance of solution 2 - Standard Dichromate-Ethanol (Standard) : 0.480 a.u.
Absorbance of solution 3 - Standard Dichromate-Ethanol (Defendant) : 0.466 a.u.
Mass of dichromate in Solution 1 : 6.25 mg
Enter the following calculated data from the calibration of the Breath-Analyzer:
Mass of dichromate in Solution 2 : 5.36 mg
Mass of dichromate consumed :
Number of moles of dichromate consumed :
Number of moles of ethanol consumed :
Mass of ethanol consumed :
i know the first one but not the others, please help tysm!
To calculate the mass of dichromate consumed, we need to find the difference between the mass of dichromate in Solution 1 and Solution 2.
Mass of dichromate consumed = Mass of dichromate in Solution 1 - Mass of dichromate in Solution 2
Mass of dichromate consumed = 6.25 mg - 5.36 mg = 0.89 mg
Now, to calculate the number of moles of dichromate consumed, we need to use the molar mass of dichromate, which is 294.18 g/mol.
Number of moles of dichromate consumed = Mass of dichromate consumed / Molar mass of dichromate
Number of moles of dichromate consumed = 0.89 mg / 294.18 g/mol = 0.00303 mol
To calculate the number of moles of ethanol consumed, we will use the ratio from the absorbance values of the standard solutions.
First, let's calculate the molar absorptivity (ε) of the dichromate in ethanol.
Molar absorptivity (ε) = Absorbance of solution 2 / (Mass of dichromate in Solution 2)
Molar absorptivity (ε) = 0.480 a.u. / 5.36 mg = 0.0896 a.u./mg
Now, the number of moles of ethanol consumed can be calculated using Beer-Lambert's Law, which states: Absorbance = ε * path length * concentration
We can rearrange the equation to solve for the concentration:
Concentration of ethanol = Absorbance of solution 3 / (ε * path length)
Since the path length is not given, we will assume it to be 1 cm.
Concentration of ethanol = 0.466 a.u. / (0.0896 a.u./mg * 1 cm) = 5.19 mg/cm³
Finally, we can calculate the mass of ethanol consumed using the concentration and the volume of the solution.
Mass of ethanol consumed = Concentration of ethanol * Volume of solution
Since the volume of the solution is not given, we cannot calculate the exact mass of ethanol consumed without this information.
Therefore, we can only calculate the mass of dichromate consumed and the number of moles of dichromate consumed. The calculation for the number of moles of ethanol consumed and the mass of ethanol consumed requires additional information.