Organic Chemistry Questions

A compound with molecular formula C6H₁0 gives three signals in its 1H NMR spectrum with the following integration values measured in mm: 13, 33, 73. a) How many protons are responsible for each signal? b) Deduce the structure of this compound.

A sample of hydrogen gas occupies 250 mL at 90 mmHg. For a gas sample at 25°C, determine the number of moles of hydrogen present in the sample. 10,962 moles 826.4 moles 0.0000912 moles 0.920 moles 0.00121 moles

Rank the following gases by the number of moles they would contain at STP, greatest to least. 30 L of helium gas, 0.5 moles of oxygen gas, 67.2 L of nitrogen gas. Helium Nitrogen Oxygen

You have 33.6 L of neon gas at STP. How many moles is this? 1.5 moles 22.4 moles 752.64 moles 11.2 moles J

In the context of small molecules with similar molar masses, arrange the intermolecular forces by strength. London dispersion forces hydrogen bonding Strongest Weakest Answer Bank dipole-dipole interactions

Calculate the mass of butane needed to produce 96.0 g of carbon dioxide. Express your answer to three significant figures and include the appropriate units.

A sample of propane, C3H8, contains 17.9 moles of carbon atoms. How many total moles of atoms does the sample contain? Express the total number of moles of carbon and hydrogen numerically.

Calculate the pressure; in atm, of 0.0158 mole of methane (CH4) in a 0.275 L flask at 27 °C. 0.13 atm 1.4 atm 1.6 atm 0.71 atm

Determine the new temperature in °C for a sample of neon with the initial volume of 2.5 L at 15 °C, when the volume is changed to 3550 mL. Pressure is held constant. 21.3 °C 294 °C -252 °C 136 °C 409 °C

Correctly rearrange Charles' Law to solve for the unknown in the following problem: Determine the new temperature in °C for a sample of neon with the initial volume of 2.5 L at 15 °C, when the volume is changed to 3550 mL. Pressure is held constant.

A sample of nitrogen (N₂) has a volume of 50.0 L at a pressure of 760 mmHg. What is the volume of gas at a pressure of 1500 mmHg if there is no change in temperature? 0.010 L 25 L 0.040 L 96.7 L

You are using your hot air balloon to travel. At constant pressure, you decrease the temperature of the gas by turning down the flame. What do you expect to happen to the volume of the 400 L balloon as the temperature decreases? about the same as 400 L; temperature alone does not affect volume more than 400 L; as temperature decreases the volume will increase less than 400 L; as temperature decreases, volume also decreases more information is needed to make a determination

A sample of helium gas has a volume of 6.5 L at a pressure of 1.11 atm and a temperature of 25 °C. What is the pressure of the gas in atm when the volume and temperature of the gas sample are changed to 1850 mL and 325 K, respectively? 0.235 atm 0.300 atm 4.25 atm 173.5 atm

The best method to prepare acetophenone is: O3 oxidation of styrene KMnO4 oxidation of styrene KMnO4 oxidation of phenylethanol NBS oxidation of phenylethanol PCC oxidation of 1-phenyl ethanol

Draw a Lewis structure for PO,³ in which the central P atom obeys the octet rule, and answer the following questions based on your drawing. The number of unshared pairs (lone pairs) on the central P atom is: The central P atom forms _ single bonds. The central P atom forms _double bonds.

Suppose there is a gaseous mixture of nitrogen and oxygen. If the total pressure of the mixture is 440 mmHg, and the partial pressure of nitrogen is 250 mmHg, calculate the partial pressure of oxygen in the mixture using Dalton's law.

Aluminum oxide, Al 203, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3. 2.146 mol 0.4207 mol 1.105 mol 0.4660 mol 2.377 mol Save Answer

Which of the following is NOT a true statement? Strong bases produce large quantities of hydroxide ions. Weak acids ionize partially in water. Strong bases react with strong acids to make salt and water. Strong acids produce large quantities of hydronium ions. Weak bases are good electrolytes.

A chemise prepares a solution of copper(II) sulfate (CuSO4) by measuring out 91.1 μmol of copper (II) sulfate into a 450. mL. volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's copper(II) sulfate solution. Round your answer to 3 significant digits.

lonic compounds may have any net charge form mostly between two metalloids have zero net charge will not dissolve in water

A flexible container at an initial volume of 7.14 L contains 3.51 mol of gas. More gas is then added to the container until it reaches a final volume of 16.7 L. Assuming the pressure and temperature of the gas remain constant, calculate the number of moles of gas added to the container.

The atomic mass of hydrogen is 1.01 g/mol. What percentage of H atoms have an atomic mass of 1.01 amu? 66 % 100 % 33 % None More information is needed to determine this. (you only have one attempt on this question)

When nitric acid (HNO3) reacts with sodium bicarbonate (NaHCO3), the products are a. hydrogen (H₁₂) and sodium carbonate (Na₂CO3). b. carbon dioxide (CO₂), water (H₂O), and sodium nitrate (NaNO3). C.carbon dioxide (CO₂), water (H₂O), and sodium carbonate (Na₂CO3). d. water (H₂O) and sodium nitrate (NaNO3). e.cwater (H₂O) and sodium carbonate (Na₂CO3).

Which of the following bases is named incorrectly? Fe(OH)3 - Iron (III) Hydroxide KOH- Potassium Hydroxide Ca(OH)₂ - Calcium Hydroxide NH3 - Ammonia Cr(OH)3 - Chromium Hydroxide

What volume of 5.16 M NaOH is needed to completely titrate 689.2 mL of 2.59 M phosphoric acid according to the equation: H3PO4(aq) + 3 NaOH(aq) → Na3PO4(aq) + 3 H₂O(l) mL

A chemist prepares a solution of barium chlorate (Ba(ClO3)₂) by measuring out 28. µmol of barium chlorate into a 150. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's barium chlorate solution. Round your answer to 2 significant digits.

Which of the statements are evidence that gases do not always behave ideally? When two gases are mixed, they follow Dalton's law of partial pressures. It is impossible to compress a gas enough so that it takes up no volume. CO₂ gas becomes dry ice (solid CO₂) at 1 atm and -78.5 °C. At 4 K and 1 atm, helium is a liquid.

In the peptide, Ala-Leu-Cys-Met, there are__ peptide bonds and the amino terminal is the amino acid A. 4; Alanine B. 4; Methionine C. 3; Methinine D.3; Alanine E. 3; there is no amino end

Gases produced by a chemical reaction can easily be collected over water. To determine the pressure of the dry gas, the vapor pressure of the water at that temperature must be subtracted from the total pressure. 1) Consider the following reaction: Mg(s) + 2HCl(aq) -> MgCl₂(aq) + H₂(g) The total pressure of gas collected over water is 650.0 mmHg and the temperature is 22.0°C What is the pressure of hydrogen gas formed in mmHg?

Insulin is.............. that regulates.............. level in the body A. steroid hormone, protein transport B. proteohormone, blood glucose C. lipoprotein, lipid transport D. enzyme, competitive inhibition E.storage protein, iron( Fe2+)

In order to neutralize 25.0mL of sulfuric acid (H₂SO4), 33.3mL of 1.0M sodium hydroxide (NaOH) is needed. Calculate the molarity of the acid. a. 0.38M b. 0.66M c. 0.76M d. 1.32M e. 1.50M

A fatty acid salt can act as a soap to remove grease because A. the nonpolar tails of the salt cause the salt to float on the surface of the water B. the nonpolar tails of the salt dissolve in the grease and the polar salt ends dissolve in water C. the polar salt ends dissolve in the grease and the nonpolar tails cause the resulting molecules to on water. D. the salt molecules combine with grease and either Ca2+ or Mg2+ to form a precipitate. E. the grease molecules form a thin layer around each salt molecule, making them soluble in water.

Answer each question below and upload an image of your handwritten work. Show ALL your work for full credit. Credit will not be granted if only the answer is shown with no work. 1) A 15.0 mL solution of H₂CO3 at an unknown concentration is titrated with 0.215 M KOH solution. If it requires 26.19 mL of KOH solution to reach the equivalence point, what is the concentration of the H₂CO3 solution? H₂CO3(aq) + 2 KOH(aq) → 2 H₂O(l) + K₂CO3(aq) 2) How many grams of sodium phosphate (Na3PO4) are in 125.0 mL of a 0.432 M solution of sodium phosphate? The molar mass of sodium phosphate is 163.94 g/mol.

Complete the table below comparing the polarities of two bonds. Enter more or less in the blank to complete the statement correctly. B-F is polar than C-F P-O is polar than P-S B-F is polar than B-N

Compare the electronegativities of each pair of atoms. Enter the symbol for the element of each pair that has the greater electronegativity. (If both atoms would be expected to have the same electronegativity, enter the word same.) Symbol for element with greater electronegativity Pair Mg and O Al and C Li and O

The reaction 2 NO(g) + 2 H₂(g) ---> N₂ (g) + 2 H₂(g) follows second-order kinetics. At 200°C, [NO] drops from 0.200 M to 0.0250 M in 100.0 s. The rate constant for the reaction is -0.350 0.350 3500 0.0208 -0.0208

The reaction between Na2CO3 and CaCl2 actually produced 25.6 g of CaCO3. If the theoretical yield is 30.15 g, What is the percent yield for this reaction? Na2CO3 + CaCl2 ---> CaCO3 + 2NaCl 100.% 58.0 % 84.9% 73.196 37.9 %

0.003 grams of alcohol in a 15 ml sample of blood 0.006 grams of alcohol in a 5 ml sample of blood 0.01 grams of alcohol in a 12 ml sample of blood 0.006 grams of alcohol in a 20 ml sample of blood Not significantly impaired (< 0.03% m/v) Impaired (≥ 0.08% m/v) = 0.006 grams of alcohol in a 5 ml sample of blood 2021 Chamberlain University LLC. All rights reserved. = 0.003 grams of alcohol in a 15 ml sample of blood = 0.01 grams of alcohol in a 12 ml sample of blood = 0.006 grams of alcohol in a 20 ml sample of blood

Complete the Lewis structure for this species: CO2 Enter the total number of valence electrons in the box. Valence electrons:

You have a gas at 35°C that is confined to a 7.5 L cylinder with pressure of 952 torr. a. What volume will the gas occupy if the pressure is decreased to 805 torr? 8.9 L 6.3 L It will remain unchanged. 5.5 L

A. A main group element with the valence electron configuration 2s22p5 is in periodic group It forms a monatomic ion with a charge of B. A main group element with the valence electron configuration 2s¹ is in periodic group It forms a monatomic ion with a charge of

If I have 82 ml of a solution with a molarity of 5.3 M NaBr, how many ml of a 1.1 M NaBr solution can I prepare? 0.07 ml 17.0 ml 478.1 ml 395.1 ml

Predict the products of the reactions below and make sure each is balanced: each, 0.5 points for balance, 0.5 points for each product) HBr + NaOH →

Use the generic elementary steps shown to below to answer the following questions. A + B ---> C + D Elementary Step 1 (slow) A + D ---> C+E Elementary Step 2 (fast) a. Based on the provided elementary steps, but is the net reaction?

A mixture containing 0.550 mol Cl₂, 0.443 mol Br2, and 0.520 mol I2 are confined to a 10.00 L vessel at 50°C. a. What is the partial pressure (in atm) of Br₂ in the mixture? b. What is the total pressure (in atm) of the mixture? 4.01 atm 0.621 atm 1.51 atm 40.1 atm

In lab you need to measure out 0.84 mol of C3H6O3 for an experiment. How many grams should you weigh out? Give your answer to 2 decimal spaces.

What is the % mass/volume concentration of a solution consisting of 36 grams of K₂SO4 with a total solution volume of 0.6 L? 6% 1.6% 60% 0.06% 21.6%

The Lewis structure for CIF₂+ is shown. What is the electron-pair geometry and the molecular geometry around the central atom? Electron Pair Geometry: Molecular Geometry:

Which one of the following molecules is nonpolar? Multiple Choice NH3 OF2 CH₂Cl

What would be the molarity of a solution made by dissolving 4.1 grams of NaCl (molecular mass: 58.44 g/mole) in water to a total volume of 0.4 ters 0.4 M 0.18 M 141.6 M 7.3 M