The blood alcohol (c2h5oh) level can be determined by titrating a sample of blood plasma with an acidic potassium dichromate solution, resulting in the production of cr3+(aq) and carbon dioxide. the reaction can be monitored because the dichromate ion (cr2o72−) is orange in solution, and the cr3+ ion is green. the unbalanced redox equation is the following. cr2o72−(aq) + c2h5oh(aq) → cr3+(aq) + co2(g) if 31.91 ml of 0.0613 m potassium dichromate solution is required to titrate 33.8 g of blood plasma, determine the mass percent of alcohol in the blood.

0,1333% of alcohol in the blood

Explanation:

The equation of titration is:

Cr₂O₇²⁻(aq) + C₂H₅OH(aq) → Cr³⁺(aq) + CO₂(g)

The balance of this reaction is:

16H⁺ + 2Cr₂O₇²⁻(aq) + C₂H₅OH(aq) → 4Cr³⁺(aq) + 2CO₂(g) + 11H₂O

31,91 mL of 0,0613 M K₂Cr₂O₇ are:

0,03191 L ₓ 0,0613 M K₂Cr₂O₇ = 1,956x10⁻³ moles of Cr₂O₇²⁻

As 2 moles of Cr₂O₇²⁻ reacts with 1 mole of C₂H₅OH the moles of C₂H₅OH in blood plasma are:

1,956x10⁻³ moles of Cr₂O₇²⁻ ₓ = 9,780x10⁻⁴ moles of C₂H₅OH

These moles are:

9,780x10⁻⁴ moles of C₂H₅OH ₓ = 0,04506 g of C₂H₅OH

The mass percent is:

0,1333% of alcohol in the blood

I hope it helps!

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.