Search & Filtering
when 1.25 gram of iron reacts with sulphur to form Fe(II) sulphide 1.24KJ of heat is released. Calculate the enthalpy of the reaction in KJ per mole.
how many moles of sulfur dioxide are held inside a 67.4 l cansiter at a pressure of 0.25 atm and a temperature of 40.0C
1. What is the pH of a 0.34 M solution of (weak acid) HF if the Ka = 6.8x10-4
?
2. If the pH of a weak acid solution is 9.5 and the original concentration of base was 0.30 M
A. what is the pOH?
B. what is the concentration of OH-
?
C. what is the equilibrium concentration of the base?
D. what is the Kb of the base?
3. Find the pH of a 0.325 M (weak acid) acetic acid solution. Ka = 1.8 x 10-5
.
4. Find the pH of a 0.056 M (weak acid)propionic acid solution (Ka = 1.4 x 10-5
).
5. Find the pH of a 0.075 M solution of (weak acid) formic acid. The acid dissociation
constant (Ka) for formic acid is 1.8 x 10-4
.
6. Find the pH of a 0.15 M solution of (weak base) ammonia, NH3. Kb = 1.8 X 10-5
7. Find the pH of a 0.600 M solution of (weak base) methylamine CH3NH2. Kb = 4.4 x 10–4
.
8. If the pH of (weak acid) HC3H5O2 is 4.2 and the Ka = 1.34x10-5
A. what is the equilibrium concentration of HC3H5O2?
B. what was the initial concentration of HC3H5O before dissociation?
How much energy is required to heat 2550g of water from 21 C to 98 C?
What is the mass of brass that requires 5200J to heat it from 23 C to 100 C? The specific heat of brass is 0.380 J/g*C.
If temperature is constant at 30°C, and pressure decreases from 1.4atm to 0.1atm, which is phase change?
derive the term symbols for the excited triplet state 1s1 2s1 and higher excited triplet state 1s1 2p1 ol he. is the transition from 1s1 2s1 to 1s1 2p1 allowed ? give reasors for your answer.
How many signals does the unsaturated ketone (CH3)2CHCH2C(O)CH=CH2have in 13 C NMR Spectra ?
what is the glucose that can be produced from a photosynthesis reaction that occurs using 10 mol CO2 using the equation 6CO2 + 6H2O --> C6H12O6 + 6O2?
Write a personal statement of no more than 5 pages that details how you exemplify the society's commitment to academics, leadership and service.
