Other Chemistry Answers

C33 H35 FN2 O5 Lipitor

Chemical structure

You may mark all of the following directly on this one structure if you make a color coded key

Where are all of these on the structure draw each with a color

alpha carbons color:

&chiral carbons color:

anomeric carbons color:

peptide bonds:

Draw structure:

Explanations for why any of the above NOT present:

1Does your structure have the ability to form a (circle): hemiacetal or acetal or neither

if methanol is added in the presence of heat and acid?

Draw the product.

If you answered neither to above question you must answer this question instead.

Does your structure have the ability to form a (circle): hemiacetal or acetal or neither if

acetone is added in the presence of heat and acid?

Draw the product.

If you answered neither to both previous questions you must explain why neither reaction

would work below.

Draw molecule at pH = 1

Overall charge:

Draw molecule at pH = 12

Overall charge:

Calculate the concentration of the chromic ion in the cell which has an electrode potential of 0.688 at 298.15 K for the given reaction:

Cr2O7 2 – (aq) + 14 H+ (aq) + 6 I – 1 (aq) → 2 Cr 3+(aq) + 3I2(s) + 7 H2O(l)

8500 kg/h of a 58% by weight mixture of methanol and water is separated by multistage

batch distillation. The top product (distillate) contains 91 % by weight methanol and

the bottom product still contains 6% of methanol by weight.

a).

Draw and label the flow diagram.

[ 2 marks]

b)

Write all the balance equations involved.

[ 3 marks]

c)

Calculate mass flowrate of distillate and bottom product.

[ 3 marks]

d).

Calculate the percentage (%) of methanol not recovered.

[ 2 marks]

The drug tolbutamine (Molar mass = 270 g/mol) has a molar absorptivity of 703 at 262 nm.

One tablet is dissolved in water and diluted to a volume of 2 L. The solution exhibits an

absorbance equal to 0.680 in a 1 cm cell.

a. In which region of the electromagnetic spectrum the drug absorbs the radiation?

b. Calculate the transmittance and % transmittance of the drug solution.

c. Calculate the concentration of the drug solution

d. Calculate the mass of tolbutamine contained in the tablet.

Substances A and B have retention times 8.20 and 8.815 min, respectively, on a 30.0 cm 

column. An unretained species passes through the column in 1.30 min. The peak withs (at 

base) foe A ana B are 0.555 and 0.605 min, respectively. Calculate:

a. The column resolution

b. The average number of theoretical plates in the column.

c. The plate height

d. The length of the column required to achieve a resolution of 1.5. Note that 

Rs = √𝑵/𝟒 x (𝜶 −𝟏/𝜶) x ( 𝑲/𝟏+ 𝑲) and the quantities K and α do not change greatly with 

increasing N and L. Substitute N1 and N2 in this equation and divide.

e. The time required to elute substance B on the column that Rs value of 1.5. Note that 

𝑡𝑅 =(𝟏𝟔 𝑹 x 𝑺/𝟐 x 𝑯)/𝒖 x (𝜶/(𝜶 − 𝟏 ))squared

x ((𝟏+𝑲)cubed/𝑲 squared) and the quantities K and α do not change greatly 

with increasing N and L. Substitute Rs1 and Rs2 in this equation and divide.