Complete and balance the following equations for gass-evolution reactions.

(NH4)2SO4 (aq) + KOH (aq) ------>

Express your answer as a chemical equation. Identify all of the phases in your answer please.

A 33.153 mg sample of a chemical known to contain only carbon, hydrogen, sulfur, and oxygen is put into a combustion analysis apparatus, yielding 59.060 mg of carbon dioxide and 24.176 mg of water. In another experiment, 21.223 mg of the compound is reacted with excess oxygen to produce 9.1726 mg of sulfur dioxide. Add subscripts below to correctly identify the empirical formula of this compound (use this order of elements: CHSO)

calculate Ecell for each of the following cells.

Al(s)|Al³⁺( 0.20M )||Fe²⁺( 0.90M )|Fe(s)

Ag(s)|Ag⁺( 0.38M )||Cl^-( 0.094M )|Cl₂(g, 0.60atm )|Pt(s)

Describe a method that can be used to separate each of the following mixtures of metal ions.

A. Ag+, Pb2+

B. Mn2+, Fe3+

C. Ni2+, Al3+

D. Cu2+, Ni2+

You mix 50.0 mL of a weak monoprotic acid with 50.0 mL of NaOH solution in a coffee cup calorimeter. Both solutions (and the calorimeter) were initially at 22.0C. The final temperature of the neutralization reaction was determined to be 22.5C.

a) What is the total amount of heat evolved in this reaction? Show all work.

b) If 0.135 moles of the monoprotic acid were neutralized in this reaction, what is the molar heat of neutralization (enthalpy) for this reaction?

An alloy is composed of elements A (78%) and B (12%) by weight. The density of the alloy is 1.95 g/cm³. The properties of these elements are shown below:

Determine:

The atom densities for the two elements.

The atomic density for element A:

              b. The absorption and scattering macroscopic cross sections for thermal neutrons.

              c. The mean free paths for absorption and scattering.

Determine the pH of each of the following solutions. Part A 0.17 M KCHO 2 Part B 0.24 M CH 3 NH 3 I Part C 0.16 M KI

The pKa of formic acid was measured by titrating a 1.00 mM solution of formic acid with NaOH in the presence of varied concentrations of NaCl. The results are as listed:

utilize a graphical method to determine the true pKa of formic acid (debye-huckle is valid)

Provide step by step instructions if excel is utilized.

A 10.0 mL aliquot of 0.1000 M base B (pKb1= 4.00, pKb2= 9.00) was titrated with 0.1000 M HCl. At what volume is the second equivalence point?

Find the pH at the volume of the acid added (VHCl) equal 10.0 mL

Find the pH at the volume of the acid added (VHCl) equal 20.0 mL.

Please Explain!

What is the standard free energy of the reaction, in kJ, at 298K for:

1 A (aq) + 1 B (aq) <--> 2 C (aq) + 2 D (aq)

if   ΔH° (A)= -3.4134 kJ/mol , ΔH° (B) = 93.8823 kJ/mol, ΔH° (C) = -26.8495 kJ/mol, and ΔH° (D) = -39.4984 kJ/mol

ΔS° (A)= 33.3845 J/(mol K) , ΔS° (B) = 92.5722 J/(mol K) , ΔS° (C) = -59.1781 J/(mol K) , and ΔS° (D) = -12.7602 J/(mol K)

A mitochondrial membrane complex consisting of ATP synthase, adenine nucleotide translocase (ATP-ADP translocase), and phosphate translocase functions in oxidative phosphorylation. Adenine nucleotide translocase, an antiporter located in the inner mitochondrial membrane, moves ADP into the matrix and ATP out. Phosphate translocase is also located in the inner mitochondrial membrane. It transports H ions and phosphate (H2PO4–) ions into the matrix.

i need to recrystallize 1,4-dichlorobenzene (started with 1:1 mix of 1,4-dichlorobenzene and 4-aminobenzoate then dissolved in diethyl ether and separated by adding HCl). the solvents I have available are 99% ethanol, methanol, water, sodium hydroxide, and sodium sulfate)
Do I need to dry the product with sodium sulfate and the rotovap before recrystallizing? and what solvent(s) would work to recrystallize after rotovap?

a) The antacid component of Tumsr is calcium carbonate. Assume Tumsr is 40.0 percent CaCO3 by mass. If we have 400. mg of Tumsr how many ml of 0.100 M HCl can we neutralize? Express your answer in mL.

b) For every 5.00 mL of milk of magnesia there are 400. mg of magnesium hydroxide. How many mL of milk of magnesia do we need to neutralize 40.0 mL of 0.500 M HCl? Express your answer in mL.

c) Suppose 13.00 mL of 0.100 M barium hydroxide is required to neutralize 17.00 ml of nitric acid with an unknown concentration. What is the concentration of the nitric acid. Express your answer in mol/L.

The compounds listed here are often found in many natural flavors and scents. Calculate the empirical formula for each compound.

ethyl butyrate (pineapple oil): C , 62.04% ; H , 10.41% ; O , 27.55%

Express your answer as a chemical formula.

methyl butyrate (apple flavor): C , 58.80% ; H , 9.87% ; O , 31.33%

Express your answer as a chemical formula.

benzyl acetate (oil of jasmine): C , 71.98% ; H , 6.71% ; O , 21.31%

Express your answer as a chemical formula.