General organic chemistry Questions and Answers

What is the mass (in amu) of 72 mercury atoms?

Copper (Cu) is element 29 on the periodic table. Calculate the mass, in grams, of 1.46 mol of Cu.

2.60 g of iron is reacted with 2.60 g of water according to the chemical equation shown below. How many grams of the excess reagent is remaining? 3 Fe(s) + 4H₂O(l) ---> Fe3O4(s) + 4 H₂(g) A) 1.48 g of water remaining B) 6.04 g of iron remaining C) 3.59 g of iron remaining D) 8.35 g of water remaining E) 4.76 g of iron remaining

A sample of Xe weighs 20.5 grams. Will a sample of Ca that contains the same number of atoms weigh more or less than 20.5 grams? Calculate the mass of a sample of Ca that contains the same number of atoms.

The following reaction steps are shown using conventional electron pushing. (a) Draw the second product whose formation would have been rationalized with this same arrow. (b) Use the bouncing arrow formalism to illustrate the formation of only the product shown.

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

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

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

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.

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?

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?

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

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.

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 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:

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.

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 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 =

Determine the concentrations of MgCl₂, Mg2+, and CI in a solution prepared by dissolving 2.43 x 10 g MgCl₂ in 2,25 L of water. Express all three concentrations in molarity. Additionally, express the concentrations of the ionic species in parts per million (ppm).

How many ATOMS of carbon are present in 5.28 grams of carbon tetrabromide ? 9.58x10^21 2. How many GRAMS of bromine are present in 8.91x1022 molecules of carbon tetrabromide ?

Parts per million (ppm) is a common way to express small concentrations of a solute in water. A sample of tap water that is 25 ppm Cl contains 25 grams of CI for every 1,000,000 grams of water. Which units are numerically equal to ppm for dilute aqueous solutions? g/L mg/L. cg/L. µg/L ng/L

A compound is found to contain 39.12% carbon, 8.772 % hydrogen, and 52.11 % oxygen by mass. The empirical formula for this compound is The molar mass for this compound is 92.11 g/mol. The molecular formula for this compound is

Calculate the mass in grams for each of the following samples. a. 1.08 moles of aluminum chloride b. 3.62 moles of sodium hydrogen carbonate c. 4.21 millimoles of hydrogen bromide (1 millimole = 1/1000 mole)

What would you multiply "atoms of cesium" by to get the units "moles of cesium"?

What would you multiply "moles of cesium" by to get the units "grams of cesium"? Drag and drop your selection from the following list to complete the answer:

A cat with a mass of 5 kg is sitting on a skateboard. A rat with a mass of 0.5 kg is sitting on an identical skateboard. 2. If you apply the same force to push each skateboard, will the cat or the rat accelerate the fastest? Explain.

Which of the following actions would cause the rate of the reaction below to decrease? CuSO4 + Mg MgSO4 + Cu a. Heating the reaction. b. Adding magnesium. c. Removing copper. d. Adding a catalyst. e. Cooling the reaction.

If 17.4 grams of hydrochloric acid (HCI) reacted, how many grams of hydrogen (H₂) were produced? NOTE: HCI has a molar mass of 36.46g and H₂ has a molar mass of 2.02g.

The hydrogen deficiency index (HDI) of C4H100 is, which means this compound has pi bonds or rings or combination of pi bonds and rings. 2 3 Clear selectic

A 1.5g sample of coniine (shown below) was dissolved in 10 mL of ethanol and placed in a cell with a 5.0 cm path length. The observed rotation was +1.21°. Calculate the specific rotation of coniine (2 pts). Is ethanol an acceptable solvent to use?

Draw the expanded structural formula of two water molecules and indicate how each of these forms hydrogen bonds with the molecule shown below. Use dotted lines to indicate hydrogen bonds. --- Files uploaded sideways or upside down will not be graded.

Calculate the number of molecules of niacin in 18 mg

Laurediol is a compound isolated from marine algae. Designate sequentially (1,2,3,4) the stereochemistry at the numbered sites in the given drawing of Laurediol.

The e.m.f of cell in V: H₂(g) |Buffer || Normal caloal electrode is 0.6885 V at 40°C when the barometric pressure is 725 mm of Hg. What is the pH of the solution. E = 0.28 .(write the value to the nearest integer)

How many mL of 0.75 M H3PO4 would be required to titrate 200.0 mL of 0.50 M Ca(OH)2 to the equivalence point? (4 points) The balanced reaction has been provided.

Consider the following reaction: 2C₂H6 + 702 4CO2 + 6H₂O Identify what main category of reaction it is. If possible, further categorize it into all other relevant types of reaction. Synthesis Decomposition Combustion Single Replacement Double Replacement Precipitation Acid-Base Oxidation-Reduction

Consider the following reaction: K₂SO4 + Ba(NO3)2 → 2KNO3 + BaSO4 Identify what main category of reaction it is. If possible, further categorize it into all other relevant types of reaction. Synthesis Decomposition Combustion Single Replacement Double Replacement Precipitation Acid-Base Oxidation-Reduction Gas Evolving

What is the oxidation number of the following element Fe?

Balance the equation Fe2S3(s)→ Fe(s) + S(s) + 69kJ 1b) What is the mole to mole ratio of Fe₂S3(s) to Fe(s) 1c.) What is molar mass of Fe2S3(s) ld.) How many moles is 28 gram of Fe2S3(s)? le. How many moles of Fe(s) does this produce using answers 1b and 1d.