Explore BrainMass

Physical Chemistry

Rate Constant with Temperature Changes

Rearrangement of methyl isonitrile to acetonitrile has activation energy of 25.0 kJ/mol and a rate constant of 8.1*10^-4s-1 @ 80 Celsius. what is the value of the rate constant @ 255.0 celsius?

Amount of natural gas burned is proportional

nt of natural gas burned is proportional to the amount of oxygen consumed. if 24.0 kg of oxygen is consumed in burning 15.0 kg of natural gas, how much air, which is 23.2% oxygen by weight, is consumed to burn 50.0 kg of natural gas? a. 80.0 kg b. 345 kg c. 31.3 kg d. 135 kg

Oxidation and reduction - arranging reactions in order

I am having trouble with this question: i) A reacts spontaneously with 1 mol/L BNO3, 1 mol/L D(NO3)2 and dilute sulfuric acid. A does not react with 1 mol/L C(NO3)2 ii) B does not react spontaneously with any of the 1 mol/L solutions above or with dilute sulfuric acid. iii) C reacts spontaneously with dilute sulfuri

Calculating pOH and pH.

Calculate the pOH and pH at 298K of solutions having the following ion concentrations: OH = 1.3 x 10^-2 M.

Smelters and Galena Conversion

A small smelter converts galena (lead sulfide) into pure lead by heating the ore with an excess of oxygen. Sulfur dioxide is produced as an air pollutant, as a result of the reaction. To remove sulfur dioxide, the flue gas is passed through a slurry of lime (calcium oxide) to produce calcium sulfate. The smelter processes 120

Mass balance

See attached for full problem. The concentration of isobutene in the overhead product is 4.8 mole %, and the concentration of propane in the bottoms is 0.7 mole %. Calculate the moles of the various components in the overhead and bottoms per 100 moles of feed.

Chemistry Multiple Choice Quiz with Answer Grid

I am preparing for my chemistry exam and would appreciate a multiple choise quiz on the last chapter (i.e., ideal gas law, superconductivity, extensive properties, critical pressure, aerobic, etc.). Can you provide me with such a quiz with the answers provided. Thanks. Chemistry Quiz 2: Multiple Choice Questions 1) Eleme

Mass Balance Problem with Fuel

A furnace burns a fuel oil, the composition of which can be represented as (CH2) n. It is planned to burn this fuel with 10 % excess air. Assuming complete combustion, calculate the composition of the flue gas on a dry basis. Please see attachment for the rest of the problem, including relevant diagrams.

Molecular weight and solution problem

The molecular weight of NaOH is 40. the molecular weight of a widely used buffer, HEPES, is 255. HEPES has a pK of 7.5 and is available in the acid form. how many grams og HEPES and NaOH are needed to produce one liter of a 0.5 molar solution of pH 7.5? of pH 7.0? of pH 8.5?

Triple point

The sublimation pressures of solid chlorine are 352 Pa at -112 C and 35 Pa at -126.5 C. The vapor pressures of liquid Chlorine are 1590 Pa at -100 C and 7830 Pa at -80C. Calculate a)heat of vaporization b)heat of sublimation c)heat of fusio d)triple point I have already figured out the first three. The heat of sublimation