In the second row of the transition metals there are five elements that do not follow the normal orbital filling. Five - Nb, Mo, Ru, Rh, and Ag-result in a [Kr] 5s14dx configuration and Pd results in a [Kr] 4d10 configuration. Write the ground state electron configuration for the following species.

Ag

Ag+

Ru

Ru3+

Rh

Rh2+

Pd

Pd+

Pd2+

At 1 atm, how much energy is required to heat 89.0 g H 2 O ( s ) at − 24.0 ∘ C to H 2 O ( g ) at 115.0 ∘ C? Use the heat transfer constants found in this table.

q = kJ

Potassium dichromate is used in breathalyzers to measure alcohol content. The balanced chemical equation for the reaction between ethanol and potassium dichromate is given below.

3CH3CH2OH (aq) + 2K2Cr2O7 (aq) + 8H2SO4 (aq) --> 3CH3COOH (aq) + 2Cr2(SO4)3 (aq) + 2K2SO4 (aq) + 11H2O (l)

a. what is the oxidation state of Cr is Kr2Cr2O7?

b. what is the oxidation state of Cr in Cr2(SO4)3

c. Is Cr oxidized or reduced in the reaction? Explain.

Question 1.) Given the following data:

C2H2(g) + 5/2 O2(g) à2CO2(g) + H2O(l)      ΔH= -1300.kJ

C(s) + O2(g) àCO2(g)                                   ΔH= -394kJ

H2(g) + O2(g) à H2O(l)                                 ΔH= -286kJ

Use Hess’s Law to calculate ΔH for the reaction

2C(s) + H2(g) àC2H2(g)

Question 2.) Calculate ΔH° for each of the following reactions using the data for the enthalpy of

formation in the appendix.

2Na(s) + 2H2O(l)à2NaOH(aq) + H2(g

Thermophilic bacterium can convert glucose (C6H12O6) to ethanol and acetic acid .

1) Calculate the reaction enthalpy ΔrH when 1 mol of glucose is oxidized to ethanol at 80∘C.
C6H12O6(s)→2C2H5OH(l)+2CO2(g)

2) Calculate the reaction enthalpy ΔrH when 1 mol of glucose is oxidized to acetic acid at 80∘C.
2O2(g)+C6H12O6(s)→2CH3COOH(l)+2CO2(g)+2H2O(l)

For the reaction 2Co3+(aq)+2Cl−(aq)→2Co2+(aq)+Cl2(g). E∘=0.483 V what is the cell potential at 25 ∘C if the concentrations are [Co3+]= 0.222 M , [Co2+]= 0.275 M , and [Cl−]= 0.309 M and the pressure of Cl2 is PCl2= 3.80 atm ?

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What would the limiting reagent be for the reacton between 1.33g of sodium bromide, 0.8g of i-butanol, and 2g of concentrated H2SO4?

Liquid helium at 4.2 K has a density of 0.147 g/mL. Suppose that a 3.00-L metal bottle that contains air at 99K and 3.0 atm pressure is sealed off. If we inject 130.0 mL of liquid helium and allow the entire system to warm to room temperature (25°C), what is the pressure inside the bottle?

A. What do antacids do? B. What are two bases that may be found listed on the labels of antacids? C. Write a balanced chemical reaction to show how one of the bases in part B does what you answered in part A.

The space shuttle carries about 7.35×10⁴ kg of solid aluminum fuel, which is oxidized with ammonium perchlorate according to the following reaction:
10Al(s)+6NH4ClO4(s)→4Al2O3(s)+2AlCl3(s)+12H2O(g)+3N2(g)
The space shuttle also carries about 6.02×10⁵ kg of oxygen (which reacts with hydrogen to form gaseous water).

Part A

Assuming that aluminum and oxygen are the limiting reactants, determine the total energy produced by these fuels. (ΔH∘ffor solid ammonium perchlorate is -295 kJ/mol.)

Part B

Suppose that a future space shuttle was powered by matter-antimatter annihilation. The matter could be normal hydrogen (containing a proton and an electron) and the antimatter could be antihydrogen (containing an antiproton and a positron). What mass of antimatter would be required to produce the energy equivalent of the aluminum and oxygen fuel currently carried on the space shuttle?

Part A

Pick an appropriate solvent to dissolve isopropyl alcohol (polar, contains an OHOH group) .

Check all that apply.

Part B

State the kind of intermolecular forces that would occur between the solute and solvent in isopropyl alcohol (polar, contains an OHOH group) .

Check all that apply.

Part C

Pick appropriate solvent(s) to dissolve sodium chloride (ionic).

Check all that apply.

Part D

State the kind of intermolecular forces that would occur between the solute and solvent in sodium chloride (ionic).

Check all that apply.

Part E

Pick appropriate solvent(s) to dissolve paraffine oil (nonpolar).

Check all that apply.

Part F

State the kind of intermolecular forces that would occur between the solute and solvent in paraffine oil (nonpolar).

Check all that apply.

SubmitRequest Answer

Part G

Pick an appropriate solvent to dissolve sodium nitrate (ionic).

Check all that apply.

Part H

State the kind of intermolecular forces that would occur between the solute and solvent in sodium nitrate (ionic).

Check all that apply.

Calculate the work (in kJ) when 2.60 moles of methane react with excess oxygen at 363 K:

CH₄(g) + 2O₂(g) ? CO₂(g) + 2H₂O(l)

Explain how FTIR-ATR is capable of measuring the absorbance of IR radiation without projecting the radiation directly through a sample container to a detector on the other side.

In the body, hemoglobin (Hb) is the substance responsible for transporting oxygen (O2) to tissues. Hemoglobin binds oxygen to produce oxyhemoglobin (HbO2):

Hb + O2 ? HbO2

Carbon monoxide (CO) can also bind to hemoglobin to produce carboxyhemoglobin (HbCO):

Hb + CO ? HbCO

The equilibrium constant for Reaction 2 (KCO) is about 210 times larger than the equilibrium constant for Reaction 1 (KO2). Thus, carbon monoxide binds to hemoglobin much more efficiently than oxygen.

KCO/KO2 = 210

a. Write a balanced equation for the displacement of oxygen from HbO2 by CO to produce HbCO. Write the equilibrium constant expression for your overall reaction.

b. Write an expression that relates the equilibrium constant for the overall reaction (i.e., from Question 1) to the equilibrium constants KCO and KO2.

c. Use your balanced equation from part (a) and your knowledge of equilibrium constants to explain why patients who are experiencing CO poisoning are generally given pure oxygen as a remedy.