1.A liquid fuel mixture contains 29.50 % hexane (C6H14), 17.70 % heptane (C7H16), and the rest octane (C8H18). What maximum mass of carbon dioxide is produced by the complete combustion of 10.0 kg of this fuel mixture? 2.Many home barbeques are fueled with propane gas (C3H8).What mass of carbon dioxide (in kg) is produced upon the complete combustion of 18.9 L of propane (approximate contents of one 5-gallon tank)? Assume that the density of the liquid propane in the tank is 0.621 g/mL. (Hint: Begin by writing a balanced equation for the combustion reaction.)
2.What mass of carbon dioxide (in kg) is produced upon the complete combustion of 18.9 L of propane (approximate contents of one 5-gallon tank)? Assume that the density of the liquid propane in the tank is 0.621 g/mL. (Hint: Begin by writing a balanced equation for the combustion reaction.)
In: Other
A pump storage facility takes water from a river at night when demand is low and pumps it to a hilltop reservoir 500 ft above the river. The water is returned through turbines in the daytime to help meet peak demand. (a) For a single 30-inch pipe, 2,500 ft long and carrying 20,000 gaVmin, what pumping power is needed if the pump efficiency is 85 percent? The friction loss is estimated to be 15 ft of water. (b) How much power can be generated by the turbines using the same total flow rate? (c) What is the overall efficiency of this installation as an energy storage system?
In: Other
Consider the reaction of phospene, ph3 with oxygen: 4ph3 + 8o2 ->p4o10 + 6h2o. Suppose a 100 kg mixture of 50% ph3 and 50% o2 by mass enters a reactor in a single stream, and single exit stream contains 25% o2 by mass. Determine mass composition of exit stream.
In: Other
heat of reaction at 400c for the following reaction:
HCl(g) + O2= Cl2(g) + H2O (g)
HHV and LHV for liquid acetone (in KJ/Kg)
In: Other
In: Other
Choose the best laboratory technique to use in each of the following situations. Each answer should only be used once.
|
In: Other
Exaplain why a water hammer is bad and what is it used for?
In: Other
What are the basic principles of FAA and ICP-OES, and what is the difference between them?
In: Other
You have just isolated a new strain of Gram negative bacteria that can catabolize the sugar aspartame. Genome comparisons to all other strains don't provide any insight into the identity of this pathway. 1) Describe an experiment to identify the pathway coding for aspartame catabolism 2) Describe an experiment to move this pathway into E. coli 3) Given what we learned in class, describe how this pathway is likely positively regulated and where promoter sequence would be 4) Describe an experiment to phenotypically confirm how this pathway is regulated using a SCREEN involving styrene catabolism 5) Describe an experiment to phenotypically confirm how this pathway is regulated using a SELECTION involving LacZ
Please list relevant strain/plasmid names, or draw/describe your own custom plasmids for these experiments
In: Other
An orange grove in Florida is exposed to a cold front causing a
sudden change in air
temperature from 25C to 0C. How long will it take for the oranges
to reach 3C in
the center? Assume that the oranges are spherical with a radius of
4 cm, the thermal
conductivity of the orange is 0.6 W/mC, specific heat of the orange
is 4.18 kJ/
kgC, the density of the orange is 1,000 kg/m3, the thermal
conductivity of the air is
0.027 W/mC, the density of air is 1.17 kg/m3, the specific heat of
air is 1 kJ/kgC,
and the heat transfer coefficient between orange and still air is
0.675 W/m2C.
In: Other
A gaseous fuel mixture stored at 745 mmHg and 298 K contains only methane(CH4) and propane (C3H8). When 12.6 L of this fuel mixture burns, it produces 761 kJ of heat. The enthalpy of combustion for CH4(g) is ?802.5kJ. The enthalpy of combustion for C3H8(g) is ?2043.9kJ. What is the mole fraction of methane in the mixture?
In: Other
a) What are the two primary mechanisms of mass transfer (molecular transport)?
b) If ???? is positive, is species ?? being consumed or generated by the reaction?
c) Are gas-phase diffusivities smaller or larger than liquid-phase diffusivities, and why?
d) What is a heterogeneous reaction? Describe the difference between a reaction-limited and mass-transfer-limited heterogeneous reaction.
e) If the diffusivity is increased, with all else held constant in a tubular heterogeneous reactor, would the diffusion boundary-layer thickness increase or decrease?
In: Other
1. the freezing point depression constant of carbon tetrachloride is 30 degrees c/m. the density of carbontetrachloride is 1.584g/cm^3. The normal freezing point of carbon tetrachloride is -23 degrees C.
a. calculate the freezing point of a solution made by mixing 12.28g of solid iodine with 250 ml of carbon tetrachloride. (show all work)
b.calculate the freezing point of a solution made by mixing 12.28g of solid naphthalene (C10H8) with 250 ml of carbon tetrachloride. (show all work)
In: Other
This question is from the material science class.
Briefly describe
1. Grain refinement
2.Solid-solution formation
3. strain hardening(cold work)
4. Precipitation Strengthening
In: Other