Organic Chemistry Questions

Which of the following is a FALSE statement? a. Pressure is created by collisions between gas particles and the walls of container. b. Atmospheric pressure is lower at higher altitudes. C. A barometer is a device used to measure atmospheric pressure. d. Standard temperature and pressure is 0 °C and 1 atm. e. A small amount of the volume occupied by a gas is empty space.

What is the IUPAC name of this compound? A) butanamide B) N-methylbutanamide C) N-dimethylbutanamide D) N,N-dimethylbutanamide E) dimethylbutanamide

A compound is found to contain 14.87% phosphorus and 85.13% chlorine by mass. What is the empirical formula for this compound?

Complete the table below for calculating the molar mass of the compound sulfur dichloride.

Shown below are the spectra (labeled A and B) for the reactant and product in a bromination reaction. One spectrum shows C3H6Br2O and the other one shows C3H6O. Identify which spectra is which, draw the two structures for the reactant and product and then explain which peaks in the NMR spectra correspond to the hydrogens in the structure.

How many moles are present in the 1.20-g sample of copper?

Copper (Cu) is a metal that is commonly used for electrical wiring. Determine both the number of moles of atoms and the number of atoms in a 1.20 g sample of copper. How many Cu atoms are in the 0.0189 mol sample?

What is the empirical formula for vinegar?

Find the oxidation numbers for each element in the following compound. Label positive values as "+X" and negative values as "-X" where X is the oxidation number you calculate. Mg(MnO4)2

Predict the major product from the addition of HBr to the following molecules: a) 3-methyl-1-pentene b) 2,2-dimethyl-3-hexene

At 473 K, the pressure of a sample of nitrogen is 1050 mmHg. What will the temperature be in °C (assuming constant volume and amount of gas) if the pressure is decreased to 833 mmHg? a. 102 °C b. 324 °C- C. 375 °C d. 597 °C e. 648 °C

You have not correctly identified the value of x. You know that x represents the number of grams of sucrose. First, calculate the number of moles of solute in 250 mL of a 0.100 M solution. Then, convert from moles to grams using the molar mass of sucrose.

If pressure increases, which of the following variables would decrease? Assume all other variables are held constant. a. Temperature b. Moles c. Volume d. Both Moles & Volume e. Both Temperature & Volume

Consider the following reaction: 2 Al +3 CuCl₂ →3 Cu + 2 AlCl3 Assuming 73.55 g of Al are reacted with 21.83 g of copper Il chloride, how much of the excess reactant is left behind (unused)? Identify the limiting reactant: CuCl2 AI

When a 0.2481-g sample of titanium metal is reacted with oxygen, the final mass of the resulting compound is 0.4139 g. Determine the empirical formula of this titanium oxide. HOW DO WE GET THERE? What is the mass of each element present in the compound? (Enter your answers to four significant figures.)

How many grams of Kr are there in a sample of Kr that contains 9.27×10^23 atoms?

An organic acid is composed of carbon (48.64%), hydrogen (8.18%), and oxygen (43.20%). Its molar mass is 74.08 g/mol. Determine the molecular formula of the compound.

An alcohol is 62.04 % C and 10.43 % H by mass. The rest is oxygen. What is the empirical formula of the alcohol? Enter the elements in the order C, H, and then O.

Vinegar contains carbon, hydrogen, and oxygen with percent masses of 40.01% C, 6.70% H, and 53.29% O, respectively. Determine the empirical formula of the compound. HOW DO WE GET THERE? What is the mass of each element in 100.0 g of vinegar? (Enter your answers to two decimal places.)

An organic acid is composed of carbon (62.04%), hydrogen (10.43%), and oxygen (27.55%). Its molar mass is 116.16 g/mol. Determine the molecular formula of the compound.

How many grams of Si are there in a sample of Si that contains the same number of moles as a 107 gram sample of Co?

How many ATOMS of nitrogen are present in 3.94 grams of dinitrogen tetroxide ? How many GRAMS of oxygen are present in 4.10×10²2 molecules of dinitrogen tetroxide ?

A sample of Sc weighs 96.7 grams. Will a sample of Be that contains the same number of atoms weigh more or less than 96.7 grams? Calculate the mass of a sample of Be that contains the same number of atoms.

Synthesize the following compounds from the given starting material. You can add on on any alkyl/ alkyl halide under 8 carbons or any necessary inorganic reagent needed (this includes triphenyl phosphine (Ph3P). Please draw all intermediates and reagents necessary to get to the product.

During formation of photochemical smog, methane react with ozone to form an aldehyde. How many moles of methane will be oxidized by 4 mole of ozone?

Which of the following types of map would best show the three dimensions of Earth's surface? road map topographic map weather map tectonic map

A compound is found to contain 55.39 % boron, 8.280 % hydrogen, and 36.33 % chlorine by mass. What is the empirical formula for this compound?

Ozone (O3) is formed in the earth's upper atmosphere by the action of solar radiation on oxygen molecules (O2). Write a balanced equation for the formation of ozone from oxygen. Balance the following equations: a. Ca(OH)2+HCl-CaCl2+H2O b. Al +O2-Al2O3 C. CH3CH3+02-CO2+H2O d. AgNO3+MgCl2-AgCl +Mg(NO3)2

Which of the following statements is/are true? I. a double bond is composed of two pi bonds II. sigma bonds have electron density on the bond axis, while pi bonds always have a nodal plane along the bond axis III. pi bonds are formed by sideways overlap of hybrid orbitals IV. there is no rotation about a pi bond Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a none are true b one is true c two are true d three are true e all are true

Find the element phosphorus, P, on the periodic table. a. What is the average atomic mass of phosphorus? b. What is its atomic number? c. Predict which isotope you would find in greatest abundance for phosphorus.

A compound 'P' containing Bromine in it, on treatment with NH3 produces 'Q', which is solid at room temperature and is free from Bromine atom. The solid Q contains 49.3% Carbon, 9.59% Hydrogen, 19.18% Nitrogen and 21.93% Oxygen. 'Q' on reaction with Br₂ and Ca(OH)₂ gives a product 'R'. The product 'R' can give carbylamine test and give ethene on reaction with excess of CH3 - I followed by heating with moist Ag₂O.

How many ATOMS of sulfur are present in 2.76 grams of sulfur dichloride ? How many GRAMS of chlorine are present in 9.76x1022 molecules of sulfur dichloride?

A solution of two diastereomers contains 77.0% of (3S,4S)-tert- butyl-3-amino-4- hydroxypyrrolidine-1-carboxylate and 23.0% of (3S,4R)-tert-butyl-3- amino-4-hydroxypyrrolidine-1- carboxylate. Calculate the percent diastereomeric excess (%e.e.) of the (3S,4S)-tert-butyl-3-amino-4- hydroxypyrrolidine-1-carboxylate in this solution.

A compound is found to contain 37.47 % carbon, 12.61 % hydrogen, and 49.92 % oxygen by mass. To answer the question, enter the elements in the order presented above. QUESTION 1: The empirical formula for this compound is QUESTION 2: The molar mass for this compound is 32.05 g/mol. The molecular formula for this compound is

A solution of a chiral compound was prepared by dissolving 15.67 g in 16.00 mL of solvent. The solution was placed in a tube that is 1.00 dm long. What is the specific rotation of light if the observed rotation was determined experimentally to be +62.41°?

A compound having an approximate molar mass of 210.0-215.0 g has the following percentage composition by mass: carbon, 33.80 % hydrogen, 1.428 % nitrogen, 19.72 % oxygen, 45.07 % Determine the empirical and molecular formulas of the compound. (Enter the elements in the order: C, H, N, O.) Empirical formula: Molecular formula:

A compound was analyzed and was found to contain the following percentages of the elements by mass: sulfur, 94.09%; hydrogen, 5.91%. Determine the empirical formula of the compound. Empirical formula:

A compound having an approximate molar mass of 165.0-170.0 g has the following percentage composition by mass: carbon, 42.86 % hydrogen, 3.598 % nitrogen, 25.00 % oxygen, 28.54 % Determine the empirical and molecular formulas of the compound. (Enter the elements in the order: C, H, N, O.) Empirical formula: Molecular formula:

Use the References to access important values needed for this question. Determine the molecular and empirical formulas for the substance shown in the ball-and-stick model below. Molecular Formula. Empirical Formula C = black H = gray

Using the average atomic masses for each of the following elements, calculate the number of atoms present in each of the following samples. a. 80.16 amu of calcium atom(s) b. 1471.2 amu of tungsten atom(s) c. 164.82 amu of manganese atom(s)

A compound is found to contain 26.73 % phosphorus, 12.09 % nitrogen', and 61.18 % chlorine by mass. To answer the question, enter the elements in the order presented above. QUESTION 1: The empirical formula for this compound is____. QUESTION 2: The molar mass for this compound is 115.9 g/mol. The molecular formula for this compound is_____.

One mole of H₂O and one mole of CO are taken in a 10 litre vessel and heated to 725 K. At equilibrium, 40 percent of water (by mass) reacts with carbon monoxide according to the equation: H₂O(g) + CO(g) ⇒ H2(g) + CO2(g) Calculate the equilibrium constant for the reaction.

Calculate the percentage composition for SiO2. Mass percentage of silicon = ____% Mass percentage of oxygen =____%

How many Fe atoms are there in 4.67 moles of Fe? ____atoms

A 5.746 gram sample of chromium is heated in the presence of excess fluorine. A metal fluoride is formed with a mass of 12.04 g. Determine the empirical formula of the metal fluoride Enter the elements in the order Cr, F empirical formula =

Enter a balanced chemical equation for the acid hydrolysis of methyl benzoate. (Use either molecular formulas or condensed structural formulas,but be consistent in your equation.) Express your answer as a chemical equation.

A compound is found to contain 26.96 % sulfur, 13.45% oxygen, and 59.59 % chlorine by mass. What is the empirical formula for this compound? To answer the question, enter the elements in the order presented above.

A 42.96 gram sample of cobalt is heated in the presence of excess sulfur. A metal sulfide is formed with a mass of 78.03 g. Determine the empirical formula of the metal sulfide.

Calculate the percentage composition for CBr4. Mass percentage of carbon = Mass percentage of bromine =

A compound having an approximate molar mass of 253.0-258.0 g has the following percentage composition by mass: Determine the empirical and molecular formulas of the compound.