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A gas stream contains 18.0 mole % hexane and the remainder nitrogen. The stream flows to a condenser, where its temperature is reduced and some of the hexane is liquefied.
A 0.500 reaction vessel equipped with a movable piston is filled completely with a 3.00% aqueous solution of hydrogen peroxide. The decomposes to water and gas in a first-order reaction that has a
Lead (II) sulfide reacts with hydrogen peroxide to form lead (II) sulfate and water. How many grams of hydrogen peroxide are needed to react completely with 265g of lead (II) sulfide?
A bag contains a mixture of copper and lead BBs. The average density of the BBs is 9.90 Assuming that the copper and lead are pure, determine the relative amounts of each kind of BB.
The element lead (Pb) consists of four naturally occurring isotopes with atomic masses 203.97302,205.97444,206.97587, and 207.97663 amu.
By how much must the iron unit cell expand to accommodate carbon? That is, what is the increase in the unit cell length.
A british thermal unit (Btu) is defined as the quantity of heat required to change the temperature of 1lb of water by 1F. Assume the specific heta of water to be independent of temperature.
How many grams of the element nickel are contained in 10.0g of a 10.2 wt% solution of nicke sulfate hexahydrate, NiSO4*6H2O?(b) The concentration of this solution is 0.412 M. Find the density.
What is the half-life of a compound if 81 percent of a given sample of the compound decomposes in 64 min? Assume first-order kinetics.(Having the correct number of sig figs is critical)
Ag has two isotopes with the masses 106.90509 and 108.9047 the average atomic mass of Ag is 107.8682 amu. What is the fractional abundance of the lightest isotope?
If the door has an area of 0.25 m2, what would the net force acting on the door be if someone opened it without relieving the pressure first?
A solid cylinder of plastic has a density of 1.6 g/cm^3. If is then cut exactly in half. What is the density of each of the pieces now and explain the reason for your answer?
Careful measurements of an ideal gas in a closed, constant volume container indicate that the pressure of the gas is 8.80 atm at 41.3 G0 and 11.33 atm at a temperature of 90.1 G0.
A articular brand of beef jerky contains 0.0552% sodium nitrite by mass and is sold in an 8.00 oz bag. what is the mass of sodium does the sodium nitrite contribute to sodium content of the bag of b
How does the value in (a) compare to the surface tension of blood, which is approximately 0.05N/m? What is needed to adjust the surface tension in the lungs so that breathing is possible?
A 9.780 g. gaseous mixture contains ethane (C2H6) and propane (C3H8). Complete combustion to form carbon dioxide and water requires 1.120 mol of oxygen. Calculate the mass percent of ethane in the
How would you prepare pentanenitrile from butanoic acid? Show the reaction steps indicating the appropriate reagents and the mechanism of each steps.
A seed crystal of diameter D (mm) is placed in a solution of dissolved salt, and new crystals are observed to nucleate (form) at a constant rate r (crystals/min).
Insulin normally activates a phosphatase that causes dephosphorylation of proteins, including enzymes. But what if a virus blocks insulin's ability to activate phosphatases in your liver?
Allosteric enzymes are multi-subunit enzymes with "allo" or other sites, to which biochemicals may bind. When these biochemicals, or allosteric effectors, bind, they change the conformational struct
Why is the ionization of Hydrogen greater than the energy of any frequency in the bright-line spectrum for Hydrogen?
What is the final temperature of the mass if all of its kinetic energy at impact is transformes into internal energy? (c sub p=25.1mol -1k-1
What is the final temperature of the mass if all of its kinetic energy at impact is transformed into internal energy? (C sub p) =25.1mol-1K-1)
Draw lewis structure for PCl3. Calculate the formal charge on P. What is the name of geometry for the molecule? Is the molecule polar?
The secondary bonding of gas molecules to a solid surface is a common mechanism for measuring the surface area of porous materials.