I don’t understand the question
Answer:
Using the information provided in the question, the percentage by mass of ethanol in the blood is 0.1949%.
Explanation:
The balanced equation for the reaction can be written as:
3CH3CH2OH + 2K2Cr2O7+ 16H+ >>>> 3CH3COOH + 4Cr3+ + 4K+ + 11H2O. This will be used to solve the problem.
The no of moles of K2Cr2O7 used = concentration X volume in dm cube.
= 0.05 X 22.6/1000 = 1.13/1000 = 0.00113 moles of K2Cr2O7 was used.
From the balanced equation above, 3 moles of ethanol will react with 2 moles of K2Cr2O7.
Therefore, 0.00113 X 3/2 moles of ethanol would have been in the blood of the subject = 0.001695 moles of ethanol.
Remember that no of moles = mass/molar mass. Then mass = moles X molar mass.
The molar mass of ethanol is 46g/mole.
Then mass = 0.001695 X 46 = 0.07797gram of Ethanol was in the blood.
Percentage by mass in blood is: 0.07797/40 X 100 = 0.1949%
They work by reducing the acid in our stomach because anti acids alkalis.
Molarity is defined as the number of moles dissolved in 1 L of solution.
The molarity of KCl has been given as 4.0 M
This means that in 1 L of KCl solution, there are 4 moles dissolved.
We have been asked to find the volume of the solution if there are 8.0 moles of solute.
If 4 moles are in - 1 L of solution
Then 8 moles of solute are in - 1/4 x 8 = 2 L solution
Volume of KCl solution is 2 L.
The answer is rings, I know this because i took a test about it and I got it right
