(typed answer please)

Calculate the volume, at 20°C and 1.00 atm, of SO₂ produced by the conventional roasting of 1.00 tonnes (1,000 kg) of nickel sulfide ore, NiS. What mass of pure sulfuric acid could be produced from this amount of SO₂?

How much heat (in kJ) is required to warm 10.0 g of ice, initially at -10.0 ∘C, to steam at 111.0 ∘C? The heat capacity of ice is 2.09 J/g⋅∘C and that of steam is 2.01 J/g⋅∘C.

Thermosets tend to be stronger than thermoplastics due to their network structures. Name and describe one way of controlling the structure of thermoplastics to make them stronger.

Using the following info and the standard enthalpy of formation for CO2(g) (-393.5KJ/mol), determine the standard enthalpy of formation of tungsten carbide, WC(s):

WC(s)+ 5/2 O2(g) --> WO3(s) + CO2(g) ∆H° = -285.80Kcal

W(s) + 3/2 O2(g) --> WO3(s) ∆H° = -200.16Kcal

A reaction has a rate constant of 1.23×10⁻⁴ s−1 at 26  ∘C and 0.232 s−1 at 79  ∘C .

Part A

Determine the activation barrier for the reaction.

Express your answer in units of kilojoules per mole.

Part B

What is the value of the rate constant at 18  ∘C ?

Express your answer in units of inverse seconds.

Commercial club soda is produced by pressurizing water with 10 atmo- spheres of CO2. Find the value of KH for CO2 on the net or in the library, and calculate how much CO2 is in a 12 fl. oz. glass of club soda. When the CO2 reverts to the gas phase (as it eventually will in your digestive system), figure out how much volume it occupies at physiological conditions (37o C and 1 atm). Then contemplate burping.

The density of liquid methanol, CH3OH (FM=34.05), is 0.791g/mL at 77 degrees F. What is this same temperature in K, and how many methanol molecules will occupy a cubic container, 1mm on each side?

A protein solution was placed in an analytic centrifuge and spun until equilibrium was reached. The measurement was then repeated. But it was realized, too late, that prior
to the second run, the protein had been denatured. The average size of a denatured protein is larger than that of a native, compact protein. (a) Do you expect the distribution of molecules to be the same, at equilibrium, for the two different runs? Explain. (b) The time that it takes to reach equilibrium depends on the sedimentation constant of the molecules. Which run will reach equilibrium faster, the one with the native protein, or the one with the denatured protein? Explain how you imagine the sedimentation process of the two molecules.

What would happen to the pH as Ksp values increase? And Why?

Two 24.0mL samples, one 0.200 MKOH and the other 0.200 M CH3NH2, were titrated with 0.100 MHI. Answer each of the following questions regarding these two titrations.

What is the volume of added acid at the equivalence point for KOH?

What is the volume of added acid at the equivalence point for CH3NH2?

Predict whether the pH at the equivalence point for each titration will be acidic, basic, or neutral.

Predict which titration curve will have the lowest initial pH.

Thanks!

A student mixed 5.00 mL of 0.0120 M Pb(NO3)2 with 5.00 mL of 0.0300 M KI and observed a yellow precipitate.

a. What is the molecular formula of the precipitate? PbI2

b. How many moles of Pb2+ are present initially? ___

c. How many moles of I- are present initially? ___ The concentration of I- at equilibrium is experimentally determined to be 8.0*10^-3 M.

d. How many moles of I- are present in the solution (10mL)? ___

e. How many moles of I- precipitated? ___

f. How many moles of Pb2+ remain in solution? ___

g. What is the concentration of Pb2+ in the equilibrium solution? ____ M (Equilibrium solution is still 10mL)

h. Determine Ksp of PbI2 from this data. ____

Write the electronic configurations for Mn, Mn²⁺, Mn⁴⁺, Mn⁶⁺, and Mn⁷⁺

Calculate the concentration and the pH in a .10 M solution of sodium acetate, Na(CH3CO2). Equilibrium constant of acetic is 1.8*10^-5.

When methyl alcohol is treated with NaH, the product is CH3O -Na+ (and H2) and not Na+ -CH2OH (and H2). Explain why this is so.

Predict the spontaneity of a reaction (and the temperature dependence of the spontaneity) for each possible combination of signs for ?rH and?rS (for the system).

-?rH negative, ?rS positive

-?rH positive, ?rS negative

-?rH negative, ?rS negative

-?rH positive, ?rS positive