Consider a benchtop synthesis reaction for a segment of DNA consisting of a helical arrangement of 14 nucleotides. (7 in each strand). The balanced chemical reaction for this hypothetical synthesis is given below.

If you allow 546.2 g of thymine, 456.7 g of adenine, 420.2 g of guanine and 514.6 g of cytosine to react in excess d-ribose and excess H3PO4, what mass of DNA may theoretically be produced?

Question 2 : The human body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average molar mass of a nucleotide is 327 g/mol, what is the average molar mass of an entire DNA double helix?

Question 3 : The total mass of DNA in the body is 50.0 g. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average length of a single nucleotide is 0.34 nm, what is the length (in km) of one strand of DNA when it is stretched out to its maximum length (not in a helix)?

Question 4 : Using the average molar mass of a DNA double helix that you calculated in Question 2, what is the molarity of DNA in the human blood system. For the volume of blood, use the average volume of all the blood in a human body which is 4700 mL.

I have 0.500 Liters of water. To that 0.500 Liters, I add the following:

a. 0.100 moles HCl

b. 0.100 moles HOAc

c. 0.100 moles NH4Cl

d. 0.100 HF

e. 0.050 moles NaOH

f. 0.050 moles NaOAc

g. 0.050 moles Mg(OH)2

What is the pH of the resulting mixture of everything?

Please show individual steps, since this question is meant to be answered sequentially from a to g. Thanks!

Part B What salt is produced in each of the following neutralization reactions? HNO3(aq)+KOH(aq)→H2O(l)+? HNO3(aq)+Ca(OH)2(aq)→H2O(l)+? HCl(aq)+Ca(OH)2(aq)→H2O(l)+? HCl(aq)+KOH(aq)→H2O(l)+? Drag the appropriate items to their respective bins.

Part C Which substances are always produced in an acid-base neutralization reaction? Check all that apply. Check all that apply. a base water an acid a gas a salt

Which of the following are true concerning the limit of quantification (LOQ) of a particular analysis method? Select all that are valid.

A 21.466 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 70.668 g of water. A 11.619 g aliquot of this solution is then titrated with 0.1062 M HCl. It required 30.75 mL of the HCl solution to reach the methyl red endpoint. Calculate the weight percent NH3 in the aqueous waste.

The pH of a 0.00125 M solution of an aqueous solution of XOH (X = an unknown element) is 3.55. Is XOH a strong acid, weak acid, strong base, or weak base? How do you know? Is X a metal or non-metal? Explain

1.

Which molecule or ion has the same molecular geometry as SeO₃^2–?

A.SO₃

B.NO₃^–

C.CO₃^2–

D.SO₃^2–

E.SeO₃

_2.

Which of the following processes is not exothermic?

A. Rb+(g)+e- = Rb(g)

B. Br(g)+e- = Br-(g)

C. Rb+(g)+Br-(g) = RbBr(s)

D. Rb(g) = Rb(s)

E. 1/2 Br2 (g) = Br(g)

5)A gaseous mixture composed of 16.0 g of O2 , 21.0 g of N2, and 16.0 g of He at 20.0°C is confined in a 25.0 L container.
What is the partial pressure of N2 in this mixture?
6)A gaseous mixture composed of 16.0 g of 2, 21.0 g of N2, and 16.0 g of He at 20.0°C is confined in a 25.0 L container.
What is the partial pressure of He in this mixture?
7)Assuming ideal gas behavior, what is the pressure in atm exerted by 1.57 mol Cl2(g) confined to a volume of 1.50 L at 273K?

1. The possible components of your mixture are unreacted ferrocene and the substituted ferrocene product(s) of your reaction, which should travel the farthest up the TLC plate (highest Rf) and why?

2. Which should have a higher Rf value: the mono-substituted ferrocene or the di-substituted ferrocene?

3. In the column chromatography portion of your experiment next week, you use different solvents or solvent mixtures to elute the column for separation of your product mixture. Why is this required? Why use solvent mixtures for column elution instead of pure solvents?

organic acid is an important chemical used in the manufacture of polyesters and plasticizers. It contains only C, H, and O. Combustion of 19.81 mg of the acid produces 41.88 mg CO2 and 6.45 mg H2O. If 0.340 mol of terephthalic acid has a mass of 166g/mol calculate the a) empirical formula b)calculatethe molecular formula

The herbicide 2,4-D is being analyzed in plant matter using triphenylphosphate (TPP) as an internal standard. A calibration sample is prepared by pipetting 10.0 µL of 119 µg/mL 2,4-D and 10.0 µL of 100 µg/mL TPP into 1.00 mL of acetonitrile (ACN). (Hint: What is the total volume?) Separation by HPLC gave the peaks shown in the table below. The sample was analyzed by homogenizing 5.196 g of plant material and extracting the 2,4-D into 2.4 mL of ACN. 10.0 µL of 100 µg/mL TPP was added to the ACN extract before HPLC gave the peak areas shown below.

Peak Areas    2,4-D TPP

Calibration Solution 28685    15865

Plant Extract    2217    5816

Calculate the concentration of 2,4-D in the plant material in units of ng/g (ppb).

ng/g

calculate ionization energy of He using Slater rules

Write net ionic equations for the cases where oxidation-reduction reactions between metals and metallic ions were observed. (Be sure you balance the reaction so that the electrons balance.)

Copper in silver sulfate, zinc in silver sulfate, magnesium in silver sulfate, zinc in copper sulfate, magnesium in copper sulfate, magnesium in zinc sulfate.

A sample containing 321.5 g of nitrogen gas is expanded isothermally at T=298 K from 1.023dm^3 to 57.28dm^3. Calculate q, w, delta U and delta H for four processes assuming N^2 behaves ideally:

(a.) in a vacuum

(b.) against a constant external pressure equal to the final pressure of the sample

(c.) reversibly

(d.) adiabatically (non-isothermal)

1. a. In an extraction experiment, in which three compounds are extracted from a solid mixture. Why would the percent recoveries be less that 100%? Please explain.

b. How do you know if the recystaillization was effective (did purification result)? Talk about melting points