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For a particular reaction, ?H° is -13.9 kJ and ?S is -41.6 J/K. Assuming these values change very little with temperature, over what temperature range is the reaction spontaneous in the forward direction?
A chlorine atom can occupy one of the nine possible sites. When a bromine is added to the system it can occupy one of hte eight sites not already occupied by the chlorine
NH3 is a weak base (Kb = 1.8 × 10-5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.049 M in NH4Cl
A standard solution was made when 1.132g of pure copper wire (MM= 63.546g/mol) was weighed, dissolved in concentrated HNO3, and diluted to 100 mL. What is the concentration of the stock solution
a chemist finds that 90.00 grams of an unknown compound contains 32.76 grams of manganese 19.08 grams of sulfur and
at a given temperature the vapor pressures of benzene and toluene are 183mm Hg and 59.2mm Hg. Calculate the mole fraction of benzene in the vapor phase over a solution of benzene and toluene with Xbenzene=0.600
Draw the base pairing between 8-oxoguanine and cytosine and 8-oxoguanine and adenine. Use single bonds to represent hydrogen bonds.
An object is coated with a layer of chromium that is 0.015 cm thick. If the object has a surface area of 15.3 cm squared, how many atoms of chromium are used in the coating. The density of chromium is 7.19 g/cm cubed.
What is the approximate pH of a solution of the salt NH4(O2CCH3) Ammonium Acetate? No calculations, only reasoning needed.
calcium hydride cah2 reacts with water to form hydrogen gas.cah2s 2 h2ol caoh2aq 2 h2gthis reaction is sometimes used
A spherical balloon of 21cm diameter is to be filled up with H2 (HYDROGEN) at STP from a cylinder containing gas at 20atm and 300K . If the cylinder can hold 2.82L of water . Calculate the no. of balloons that can be filled up in cylinder?
Problem- Certain proteolytic enzymes react in alkaline solutions. One of these enzymes produces 1.8 micromoles of hydrogen ions per second in a 2.50 mL portion of a buffer composed of 0.25M NH3 and 0.20 NH4Cl. By how much will the concentration of..
a 93 L sample of dry air cools from 145 degrees C to -22 degrees C while the pressure is maintained at 2.85 atm. what is the final pressure?
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