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3 years ago

What strucrutal information can we gather from NMR spectroscopy? Can NMR alone determine the structure of a molecule?

Chemistry

1 answer:

N76 [4]3 years ago

3 0

Answer:

NMR reveals the chemical environment of atoms in a molecule

Explanation:

Nuclear magnetic resonance is a choice method among chemists when attempting to decipher the structure of a molecule.

There are several atoms whose nuclei are NMR active. Such nuclei include; H-1, C-13, etc.

The splitting pattern in an NMR spectrum gives important information about the chemical environment of atoms in the molecule.

However, NMR alone can not solely give all the required information about the structure of a molecule.

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Perform the following for Part C of this lab:

kaheart [24]

Answer:

a. 0.0110 L

b. 0.0020 L

c. 0.011 mol

d. 5.5 M

e. 0.66 g

f. 33%

Explanation:

There is some info missing. I will use some values to show you the procedure and then you can replace them with your values.

Titrant (NaOH) concentration: 1.0 M

Vinegar volume: 2.0 mL

Initial buret reading (initial NaOH volume): 0.1 mL

Final buret reading (final NaOH volume): 11.1 mL

a. Calculate the volume of NaOH that was added to the vinegar. Convert this volume to liters. Show your work.

The volume of NaOH is the difference between the final and the initial buret reading.

11.1 mL - 0.1 mL = 11.0 mL × (1 L/1000 mL) = 0.0110 L

b. Convert the measured volume of vinegar to liters. Show your work.

2.0 mL × (1 L/1000 mL) = 0.0020 L

c. Calculate the moles of NaOH using the volume and molarity of NaOH. Show your work. moles = molarity x volume

moles = molarity × volume

moles = (1.0 mol/L) × 0.0110 L = 0.011 mol

d. Since the reaction ratio is 1:1, the moles of acetic acid in the vinegar is equal to the moles of NaOH reacted during the titration. Calculate the molarity of the acetic acid in the vinegar. Show your work. molarity = moles / volume

molarity = moles / volume

molarity = 0.011 mol/0.0020 L = 5.5 M

e. Calculate the grams of acetic acid in the vinegar. Show your work. mass = moles x molar mass (g/mol)

mass = moles × molar mass

mass = 0.011 mol × 60.05 g/mol = 0.66 g

f. Assuming that the density of vinegar is very close to 1.0 g/mL, the 2.0 mL sample of vinegar used in the titration should weigh 2.0 g. Use this to calculate the mass % of acetic acid in the vinegar sample. mass % = (mass acetic acid / mass vinegar) * 100%

mass % = (mass acetic acid / mass vinegar) * 100%

mass % = (0.66 g /2.0 g) * 100% = 33%

6 0

3 years ago

How many atoms are in 6.78x1024 molecules of oxygen gas? PLEASE HELP WILL marK braNLIes

sineoko [7]

6942.72
I hope this works!

4 0

3 years ago

Define a salt bridge. Define a salt bridge. A pathway between the cathode and anode in which ions are oxidized. A pathway, compo

ycow [4]

Answer:

A pathway by which counter ions can flow between the half-cells without the solutions in the half-cell totally mixing.

Explanation:

Salt bridge is a link between oxidation half and reduction half of a galvanic cell.

Functions of salt bridge are:

Maintaining electrical neutrality

Preventing cell from reaching equilibrium

For creating salt bridge, a U shaped glass tube is filled with an inert electrolyte. Electrolytes used in the salt bridge generally do not reacts with the cell chemicals.

Cations and anions of the electrolytes have same ionic conductivity and hence, migrate with the same speed.

Most commonly potassium chloride, sodium chloride and potassium nitrate are used as an electrolyte in salt bridge.

Electrolyte are generally mixed with agar agar to prevent mixing of chemicals in the two half cells.

5 0

3 years ago

What is the final step of a scientific investigation?

vekshin1

Answer:

Communicating Results

The last step in a scientific investigation is communicating what you have learned with others. This is a very important step because it allows others to test your hypothesis. If other researchers get the same results as yours, they add support to the hypothesis.

3 0

3 years ago

Read 2 more answers

A student sets up the following equation to convert a measurement. (The stands for a number the student is going to calculate.)

Crank

Answer:

0.090 J/(mmol·°C) × (1000 mmol/mole × 1 kJ/(1000 J)) = 0.090 kJ/mole

Explanation:

The unit of conversion from kilo-Joules to Joules is given as follows;

1000 Joules = 1 kilo-Joule

The unit of conversion from milimoles to moles is given as follows;

1000 milimoles = 1 Mole

Therefore, we have

The value of the given expression is 0.090 J/(mmol·°C) × 1000 mmol/mole × 1 kJ/(1000 J) = 0.090 kJ/mole

0.090 J/milimole = 0.09 kJ/mole.

3 0

3 years ago