100 mL of buffer solution that is 0.15M HA (K_a= 6.8x10^-5) and 0.20M NaA is mixed with 15.2mL of 0.35M NaOH. What is the pH of the resulting solution?

for question 3 im getting 96.234 sec but it says its wrong but close to the answer.
for activation energy.. i get 24.6 kj/mol but its wrong

3) You mix together in the proper manner the following VOLUMES:
0.0100 M Potassium iodide...14.7 mL
0.0010 M Sodium thiosulfate...5.6 mL
Distilled water...22.7 mL
0.0400 M Potassium Bromate...11.7 mL
0.100 M Hydrochloric acid...5.6 mL
Using the rate constant and rate equation from problem 2),
exponent c is 1.92
exponent constant K 4.7125
CALCULATE the time to turn blue...__________________ sec (c)

4) A plot of log Rate vs 1/T gives a best straight line which goes through....
1/T = 0.00300, log rate = -4.46
and 1/T = 0.00352, log rate = -6.00.
CALCULATE:

The Slope of the line...is ________-2961.53_____ (d)

The Activation Energy (Ea) (Kj/mol)...________________(e)
thanks in advance

How much heat energy is required to convert 53.0 g of solid ethanol at -114.5 °C to gasesous ethanol at 141.8 °C? The molar heat of fusion of ethanol is 4.60 kJ/mol and its molar heat of vaporization is 38.56 kJ/mol. Ethanol has a normal melting point of -114.5 °C and a normal boiling point of 78.4 °C. The specific heat capacity of liquid ethanol is 2.45 J/g·°C and that of gaseous ethanol is 1.43 J/g·°C.

The rate constant of the elementary reaction 2HI(g) H2(g) +I2(g) is k = 1.97 L mol-1 s-1 at 604°C, and the reaction has an activation energy of 206 kJ mol-1.

(a) Compute the rate constant of the reaction at a temperature of 767°C. L mol-1 s-1

(b) At a temperature of 604°C, 177 s is required for half of the HI originally present to be consumed. How long will it take to consume half of the reactant if an identical experiment is performed at 767°C?

Calculate the freezing point and boiling point of a solution containing 7.90 g g of ethylene glycol (C2H6O2) in 92.7 mL of ethanol. Ethanol has a density of 0.789 g/cm3

Calculate the freezing point of the solution.Express the answer using four significant figures.

Calculate the boiling point of the solution.Calculate your answer using three significant figures.

if 92.8 grams of sodium nitrite are dissolved in 2.3L of water, the resulting solution has a molarity of

1. The experimental empirical formula of a magnesium oxide compound was determined. To do this a magnesium ribbon weighing 0.252 g was heated in a crucible. From the data listed, determine the empirical formula for the magnesium oxide product. Please show all work! I'm trying to really understand

          Mass of empty crucible and cover: 20.74 g

          Mass of crucible, cover, and final product: 21.17 g

Hand draw the following transformations step by step, including all intermediates. Ideally, also show electron pushing

A. Conversion of asparagine to aspartic and isoaspartic acid in peptides.
B. Conversion of aspartic acid to isoaspartic acid in peptides.
C. Cleavage of the peptide backbone at the aspartic acid residue.
D. Discuss whether acid may catalyze each reaction (A, B or C); i.e., whether the reaction is faster at (pH lower than 7) than at pH 7.

E. Discuss whether base may catalyze each reaction (A, B or C); i.e., whether the reaction is faster at (pH higher than 7) than at pH 7.

1.) The cell reactions occurring in a battery are given by:

Cathode : 2MnO2 (s) + H2O (l) + 2e-→ Mn2O3 (s) + 2HO- (aq) E 0 red = +0.15 V

Anode : Zn (s) + 2HO- (aq) → Zn(OH)2 (s) + 2e- E 0 red = -1.25 V

a) What is the overall cell potential? What is the free energy change for this process?

b) During the discharge of the battery, 2.00 g of Mn2O3 is produced at the cathode. How many grams of Zn were consumed?

c) Consider this half reaction: Cd(OH)2 + 2e- → Cd(s) + 2HO- (aq) E°red = -0.76V What is the overall cell potential and free energy change of the battery described above if the Zn anode is replaced by Cd?

2.) Ca(s) can be obtained by electrolysis of molten CaCl2. What amperage is needed to produce 10.00 g of Ca(s) in a period of 1h assuming that the process is 100% efficient?

The following mechanism has been proposed for the gas-phase reaction of chloroform (CHCl₃) and chlorine:
1) Cl₂ ⇔ 2 Cl (fast, reversible)
2) Cl + CHCl₃ → HCl + CCl₃ (slow)
3) Cl + CCl₃ → CCl₄ (fast)
What rate law does this mechanism predict? Choose from the list below and enter the letters for all the terms needed in the rate law. (So for a rate law of k[Cl₂] enter AC, and for a rate law of k[Cl₂][CHCl₃] enter ACE.)

Calculate how many milligrams of the drug are contained in 2.0mL of a 3.0% (w/v) solution ofC₁₇H₁₉N₃O₃S

which one of the following molecules is polar?
a. CS2, b. SO2 c. XeF2 d.XeF4, e. SO3