For the reaction SO₂(g) + NO₂(g) == NO(g) + SO₃(g), Kc = 85.0 at 460

Questions

A.      Use your results to determine if the forward reaction in the potassium chromate/HCl reaction endothermic or exothermic. Explain your answer, using Table 1 to help construct your thoughts.

B.      Write the equation for the equilibrium constant (K) of the reaction studied in this exercise.

2K2Cr4 + 2HCl ------> Cr2o7 + H2O + 2KCl

Use the information below to answer Questions C, D, and E:

The equilibrium constant (K) of the reaction below is K = 6.0 x 10^-2, with initial concentrations as follows: [H₂] = 1.0 x 10^-2 M, [N₂] = 4.0 M, and [NH₃] = 1.0 x 10^-4M.

N2 + 3H2 ------> 2NH3

If the concentration of the reactant H₂ was increased from 1.0 x 10^-2 M to 2.5 x 10^-1M, calculate the reaction quotient (Q) and determine which way the equilibrium position would shift.

If the concentration of the reactant H₂ was decreased from 1.0 x 10^-2 M to 2.7 x 10^-4M, calculate the reaction quotient (Q) and determine which way the equilibrium position would shift.

If the concentration of the product NH₃ was decreased from 1.0 x 10^-4 M to 5.6 x 10^-3M, calculate the reaction quotient (Q) and determine which way the equilibrium position would shift.

Exercise 2.58. Part A: Determine the number of Kr atoms in a 5.55 −mg sample of krypton.

Part B:Determine the molar mass, M, of an element if the mass of a 2.80×1022−atom sample of the element is 2.09 g.

Part C: Determine the identity of an element if the mass of a 2.80×1022−atom sample of the element is 2.09 g. (Answer choices: titanium. potassium, scandium, calcium.)

Exercise 2.56. Without doing detailed calculations, indicate which of the following quantities contains the greatest number of atoms: 6.022×1023Ni atoms, 25.0 g nitrogen, 52.0 g Cr, 10.0cm3 Fe (d=7.86g/cm3). (answer choices: Ni, Nitrogen, Cr, Fe)

Excercise 2.62. A particular lead–cadmium alloy is 8.0% cadmium by mass. What mass of this alloy, in grams, must you weigh out to obtain a sample containing 6.30×10²³ Cdatoms? Express your answer using two significant figures.

Exercise 3.6 Determine the mass, in grams, of,

Part A 7.32 mol N2O4

Part B 3.22×10²⁴ O2 molecules

Part C 18.8 mol CuSO4⋅5H2O

Part D 4.14×10²⁴ molecules of C2H4(OH)2

Excercise 3.11

Part A moles of N2O4 in a 145 −g sample

Part B N atoms in 43.5 g of Mg(NO3)2

Part C N atoms in a sample of C7H5(NO2)3 that has the same number of O atoms as 12.4 g C6H12O6

thank you in advance ^^

Calculate the free-energy change for ammonia synthesis at 25 ? C(298 K) given the following sets of partial pressures:

a.1.0 atm N2, 3.0 atm H2, 0.020 atm NH3

b. 0.010 atm N2, 0.030 atm H2, 2.0 atm NH3

1. The molecular weight of anhydrous calcium chloride is 110.99 grams/mol. How many grams do you need for 750 ml of 250uM calcium chloride?

2. Ethanol is supplied in a 90% solution. You need 275 mL of 75% Ethanol for your experiment. How would you make this solution?

3.You have 12 mL of cells you need to treat with Hydrogen Peroxide (H₂O₂), such that the final concentration of H₂O₂ is 50 uM. How much of a 30 mM stock solution of H₂O₂ would you add to your cells?

4. You need to prepare a stock solution of medium for your culture cells, which usually includes liquid salt solution and bovine serum. Your liquid salt solution is supplied in a 50X concentration, and you need to dilute it to 1X for use. You also need to add 75% fetal bovine serum for a final concentration of 15%. How would you make up 0.80 liters of this culture media using water as your solvent?

5. You need to treat cells with arsenite such that it has a final concentration of 25 uM once it has been added to the cells. You need to treat 10mL of cells, and you don't want your treatment volume to be more than 7 uL per 1mL of cells. What concentration should you make your stock solution?

I am wondering what the rule is for determining functional group positions for the most stable chair and boat conformations of cyclohexanes; meaning basically is there a pattern as to whether the functional group will be axial or equatorial for the most stable conformation based on which C # it is attached to (i.e. C- 1, 2, 3, 4, 5, or 6)?

What's the most stable for chair and boat of cis-1-bromo-4-methylcyclohexane as well as the trans-1-bromo-4-methylcyclohexane? (which group is axial and which is equatorial) Thank you

A 0.100 M solution of a weak base has a pH of 9.95. What is the base hydrolysis constant, Kb, for the weak base?

When 2.65 g of an unknown weak acid (HA) with a molar mass of 85.0 g/mol is dissolved in 250.0 g of water, the freezing point of the resulting solution is -0.257 ∘C.

1. Calculate the pH of a solution prepared by mixing 2.50 L of 2.35 M HF with 4.50 L of 1.56 M NaF.

2. A 4.00-g sample of NaOH is added to 2.00 L of the solution prepared in problem 1. Calculate the pH of the new solution. Assume any volume change is negligible.

What volumes of 1.0 M NH4NO3 and 1.0 M NH3 would be required to prepare 2.00 L of a buffer

with a pH of 9.00? The Kb of NH3 is 1.8 × 10–5.

How many grams of solid NaOH would need to be added to 5.00 L of 0.50 M acetic acid to

prepare a buffer with a pH of 5.00, assuming no volume change occurs upon the addition? The Ka of

acetic acid is 1.8 × 10–5.

After recrystallizing an impure sample of benzoic acid, a student scratched it off the filter paper and took a melting point. Most of the compound melted between 121 and 122 degrees Celsius. A small amount remained un-melted even at temperatures above 200 degrees celsius. Explain this behavior.

A)

Titration of an acidic solution of Na2C2O4 with KMnO4(aq).

Which species is the reducing agent?

Express your answer as an ion.

I know the reducing agent is the Na2C2O4 but I need the ION form.

B)A voltaic cell utilizes the following reaction:
2Fe3+(aq)+H2(g)→2Fe2+(aq)+2H+(aq)

.What is the emf for this cell when [Fe3+]= 3.50 M , PH2= 0.99 atm , [Fe2+]= 1.1×10⁻³ M , and the pHin both compartments is 4.15?

Express your answer using two significant figures.

0.771 V is not correct

With an H2SO4 concentration of 85% how many moles of water will be available to the reaction when 9.0 mL of 85% H2SO4 is used? (Density of 85% H2SO4 is 1.7 g/mL) calculations please This is used with the hydration of 1-hexene that has a density of 0.67 g/mL Also what is the theoretical yield in moles and grams of hexanol. Calculations please.

1) A first-order reaction has a half-life of 15.5 s . How long does it take for the concentration of the reactant in the reaction to fall to one-eighth of its initial value?

2) The rate constant for a certain reaction is k = 4.30×10−3 s−1 . If the initial reactant concentration was 0.350 M, what will the concentration be after 8.00 minutes?

Ionization energy is an inconsistent trend. For instance, the ionization energy of oxygen is lower than that of nitrogen and the ionization energy gallium is less than that for zinc. Suggest reasons this occurs and indicate other regions on the periodic table that this may occur.