calculate the mass percent of oxalate ion in H2C2O4*2H2O and (NH4)2C2O4*H2O

3. Which of the following is an ortho and para-director and a deactivator? (10 pts)
a. —NHCOCH2CH3 b. —CH2CH2CH3
c. —CH2CCl3 d. —COCH2CH2Cl
e. none of the above

A Photomultiplier tube can detect a single photon, but a photodiode cannot. Why is this? As part of your answer sketch the main components of both devices and describe how they work.

A buffer solution contains 0.29 mol of phenol (HC₆H₅O) and 0.75 mol of sodium phenoxide (NaC₆H₅O) in 5.20 L.
The K_a of phenol (HC₆H₅O) is K_a = 1.3e-10.



(a) What is the pH of this buffer?

pH = ?????????????


(b) What is the pH of the buffer after the addition of 0.06 mol of NaOH? (assume no volume change)

pH = ????????????


(c) What is the pH of the original buffer after the addition of 0.59 mol of HI? (assume no volume change)

pH = ????????????

which of the following yields a buffer solution when equal volumes of the two solutions are mixed?   A.) 0.10M HCl and 0.10M NaCl B.) 0.15M HNO3 and 0.15M NaNO3 C.) 0.10M HF and 0.10M NaF D.) 0.10M HClO4 and 0.10M NaClO4 E.) 0.15M HBr and 0.15M NaBr

When 5.00 g of acetone (C3H6O) burns in air, carbon dioxide gas and liquid water are formed. Enough heat is liberated to increase the temperature of 1.000 kg of water from 25.0◦C to 61.8◦C. The specific heat of water is 4.18 J/g-◦C

1. How many kJ of heat are liberated by the combustion described?

2. How many grams of acetone must be burned to liberate 5.00 kJ?

3. Write the thermochemical equation for the combustion of acetone.

4. What is ΔH◦f for acetone?

5. What volume of oxygen at 25◦C and 747 mm Hg is consumed when 25.00 kJ of heat are liberated?

Gastric juice (pH 1.5) is produced by pumping HClfrom blood plasma (pH 7.4) into the stomach. Calculate the amount of free energy required to move H+ at 37 °C under cellular conditions? How many moles of ATP must be hydrolyzed to provide this amount of free energy? How many molecules of ATP is that? he free energy change for ATP hydrolysis under cellular conditions is about -58 KJ/mol.

**Ignore the effects of the transmembrane electrical potential**

Find a specific example of where nuclear power/energy/technology is being used and write and telling us about your example. Make sure to include the specific element information. State the Isotope name. When was it discovered? What is the half-life? What is the chemical reaction? How does it decay? (for example, "it decays with the emission of an alpha-particle") Include what nuclear processes are being used and how it might be a benefit to man-kind or a danger. Also include information about any controversies that may surround your example, along with your own opinion about it.

You can smell the odor of cooking onions from far away. You can smell the odor of cooking onions from far away. As onions are heated the volume of the gas causing the smell increases. The pressure of the gas which causes the smell is very high. The random movement with high velocities leads to diffusion of the gas particles. Since gas particles are very small, they can penetrate through large volumes of air.

Here are the answers for the previous part of this question, it has multiple parts (these are all at 25 degrees):
A) 2CH4(g)→C2H6(g)+H2(g)
ΔH∘rxn 64.6 kJ
B) 2NH3(g)→N2H4(g)+H2(g)
ΔH∘rxn 187.2 kJ
C) N2(g)+O2(g)→2NO(g)
ΔH∘rxn 182.6 kJ
D) 2KClO3(s)→2KCl(s)+3O2(g)
ΔH∘rxn -77.6 kJ
E) For the reaction in part A calculate ΔS∘rxn at 25 ∘C.
ΔS∘rxn -12.7

I NEED:
F) For the reaction in part B calculate ΔS∘rxn at 25 ∘C.
G) For the reaction in part C calculate ΔS∘rxn at 25 ∘C.
H) For the reaction in part D calculate ΔS∘rxn at 25 ∘C.

Calculate the pH of 0.1 mol/L H2SO4 ; you are given the second dissociation constant of the acid to be 0.01.

Use the table of thermodynamic data in your text, a Chemistry/Physics CRC, or the internet (but be careful with data off the internet), to calculate the molar enthalpy of the following reactions:

1) An aqueous solution of sodium hydroxide reacts with an equeous solution of hydrochloric acid, yielding water.

2) An aqueous solution of sodium hydroxide reacts with an aqueous solution of ammonium chloride, yielding aqueous ammonia, NH₃, and water.

3) An aqueous solution of hydrochloric acid reacts with aqueous ammonia, NH₃, yielding aqueous ammonium chloride.

The reaction A(aq) ---> B(aq) + C(aq) is a first order reaction. The half-life of A(aq) is 86.6 s at 25.0^oC and its half-life is 66.2 s at 45.0^oC. What is its half-life (in s) at 65.0^oC?

The force constants for the diatomic molecules CO and HI are 1860 N/m and 320 N/m respectively.

Plot the potential energy curves for these two in a way that highlights their differences (i.e. on a single graph).

Calculate the frequency of motion for both molecules (does this result surprise you?).

Calculate the wavelength of light needed to excite these molecules from their vibrational ground states (v=0) to their vibrational first excited states (v=1).