Calculate ΔG∘rxn for the following reaction:
4CO(g)+2NO2(g)→4CO2(g)+N2(g).
Use the following reactions and given ΔG∘rxn values:
2NO(g)+O2(g)→2NO2(g), ΔG∘rxn= - 72.6 kJ
2CO(g)+O2(g)→2CO2(g), ΔG∘rxn= - 514.4 kJ
12O2(g)+12N2(g)→NO(g), ΔG∘rxn= 87.6 kJ

This question is from a Chemistry lab on constructing a half-potential reduction series. In part A of the lab we must determine if a metal medallion is appropriate or not (could be iron, galvanized, or other appropriate metal). We want to convert Cu^2+ to Cu. How do we determine if the metal is appropriate?

calculate the volume (in milliliters) of 3.0M naoh that must be added to a 1.00M ch3cooh solution to make a buffer having ph of 4.90

A mixture of NH3(g) and N2H4(g) is placed in a sealed container at 310 K . The total pressure is 0.48 atm . The container is heated to 1200 K at which time both substances decompose completely according to the equations 2NH3(g)→N2(g)+3H2(g)  ; N2H4(g)→N2(g)+2H2(g) . After decomposition is complete the total pressure at 1200 K  is found to be 4.5 atm.

Find the percent amount (moles) of N2H4(g) in the original mixture. (Assume two significant figures for the temperature.)

Express your answer using two significant figures.

In which of the reactions below is ΔH not an enthalpy of formation?

Group of answer choices

Both b and c are not enthalpy of formation reactions.

2C(s) + O2(g) → 2CO(g)

Mg(s) + Cl2(g) → MgCl2(s)

Ca(s) + 1/2O2(g) → CaO(s)

C(s) + O2(g) → CO2(g)

All of the following statements are false EXCEPT

Group of answer choices

the frequency of light is directly proportional to the speed of light (in a vacuum).

the wavelength of light is directly proportional to its frequency.

the wavelength of light is directly proportional to the speed of light (in a vacuum).

the frequency of light is inversely proportional to its energy.

the energy of a photon of light is inversely proportional to its wavelength.

Draw the distribution of d electrons for the central atoms in the following molecules using crystal field theory.

K₃[Cr(C₂O₄)₃] 3H₂O (octahedral)

K₂[Cu(C₂O₄)₂] 2H₂O (tertrahedral)

Biochemistry Question:

Understand the role of key metabolites in terms of whether the cell has energy or needs energy (e.g., glucose, acetyl-CoA, ATP, AMP, NAD⁺, NADH)

Meaning, which meabolites indicate that the cell has energy and which indicate that the cell needs energy?

how do you find the wavelength of highest intensity fluorence by looking at the excitation and emission spectrum?

why do some wavelengths show maximum intensity and the rest decrease in fluorescence emission intensity?

In the structure of testosterone, identify all the primary, secondary, tertiary, and quarternary carbons.

A 0.5070 g solid sample containing a mixture of LaCl3 (molar mass = 245.26 g/mol) and Ce(NO3)3 (molar mass = 326.13 g/mol) was dissolved in water. The solution was titrated with KIO3, producing the precipitates La(IO3)3 and Ce(IO3)3. For the complete titration of both La3+ and Ce3+, 42.10 mL of 0.1204 M KIO3 was required. Calculate the mass fraction of La and Ce in the sample.

mass fraction La:

g Lag sample

mass fraction Ce:

g Ceg sample

Balance the following redox reaction: NH₄⁺ to NO₂^- via oxygen reduction

B) Write the full balanced reaction. No fractions.

C) Indicate which species (molecules) are being oxidized and reduced

D) Within these species (molecules), identify which elements are being reduced and oxidized. For these elements, show the change in their oxidation numbers (start and end oxidation numbers).

E) Calculate the pe°_cell for this reaction in water and determine whether this reaction will proceed spontaneously (calculate ΔG).

What volumes of 0.1 M acetic acid, pK_a 4.76, and 0.1 M sodium acetate are required to make 1 L of acetate buffer, pH 5.30?