5a. When 4.355 grams of a hydrocarbon, C_xH_y, were burned in a combustion analysis apparatus, 14.72 grams of CO₂ and 3.014 grams of H₂O were produced.

In a separate experiment, the molar mass of the compound was found to be 26.04 g/mol. Determine the empirical formula and the molecular formula of the hydrocarbon.

• Enter the elements in the order presented in the question.
  

  empirical formula =

  molecular formula =

5b.
A 12.57 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 17.83 grams of CO₂ and 10.95 grams of H₂O are produced.

In a separate experiment, the molar mass is found to be 62.07 g/mol. Determine the empirical formula and the molecular formula of the organic compound.

• Enter the elements in the order C, H, O
  

  empirical formula =

  molecular formula =

5c.

A 4.550 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 6.452 grams of CO₂ and 3.963 grams of H₂O are produced.

In a separate experiment, the molar mass is found to be 62.07 g/mol. Determine the empirical formula and the molecular formula of the organic compound.

• Enter the elements in the order C, H, O
  

  empirical formula =

  molecular formula =

Describe the principle of separation in a column used for size – exclusion chromatography. What is the separation range in term of molecular weight? Give the definition of “gel filtration: and “gel permeation”.   

When ammonia is added to a solution that has Cu(OH)2(s) precipitate in it, the precipitate dissolves. Use Le Châtelier’s principle to explain this.

1. For the following reaction, 4.68 grams of butane (C₄H₁₀) are allowed to react with 20.3 grams of oxygen gas .

butane (C₄H₁₀)(g) + oxygen(g) ---> carbon dioxide(g) + water(g)

What is the maximum amount of carbon dioxide that can be formed?

What is the FORMULA for the limiting reagent?

What amount of the excess reagent remains after the reaction is complete?

2. For the following reaction, 24.8 grams of diphosphorus pentoxide are allowed to react with 12.6 grams of water .

diphosphorus pentoxide(s) + water(l) ---> phosphoric acid(aq)

What is the maximum mass of phosphoric acid that can be formed?

What is the FORMULA for the limiting reagent?

What mass of the excess reagent remains after the reaction is complete?

3. For the following reaction, 46.0 grams of iron are allowed to react with 18.4 grams of oxygen gas .

iron(s) + oxygen(g) ---> iron(III) oxide(s)

What is the maximum mass of iron(III) oxide that can be formed?

What is the FORMULA for the limiting reagent?

What mass of the excess reagent remains after the reaction is complete?

How do you use the Rydberg equation to determine the color of a flame test for an element. For example how do we know that potassium gives off a violet color during a flame test using the Rydberg equation?

Calculate the molarity (M) of 150.6 g of H2SO4 in 1.290 L of solution.

Please explain the affects that concentration of monomer can have on typical a radical polymerization

What is the equilibrium concentration of Ni^2+ (aq) in the solution. If one millimole of Ni(NO3)2 dissolves in 220.0 mL of a solution that is 0.300 M in ammonia?

mass of Na2S2O3 is 1.220g

titration of bleach with Na2S2O3 solution:

trial 1: total volume used 66mL

trial 2: total volume used 73.8mL

Density of Bleach 1.074 kg/L

a) find the moles of Na2S2O3 used to titrate the bleach solution

b)find the moles of I2 formed by reaction with bleach

c) find the molarity of OCl- present in the bleach solution

d) find the grams of NaOCl present in the bleach

e) find the percent NaOCl present in the bleach

What is the molarity of a solution containing 13.7 grams of NH3 in 1.55 liters of solution?

Calculate the pH of a 0.100 M sodium benzoate, NaC6H5CO2, solution. The Ka of acetic acid is 6.3 x 10-5

The vapor pressure of benzene is 73.03 mm Hg at 25 °C. A nonvolatile, nonelectrolyte that dissolves in benzene is cholesterol.  

Calculate the vapor pressure of the solution at 25 °C when 5.507 grams of cholesterol, C₂₇H₄₆O (386.6 g/mol), are dissolved in 205.6 grams of benzene.

benzene = C₆H₆ = 78.12 g/mol.

VP(solution) = ____ mm Hg