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1. The melting temperature ( Tm ) of a sample of poly(decamethylene adipate) with a number-average degree of polymerization ( xn ) of 3 was found to be 65oC. Tm was found to be 75oC for a sample of the same polymer with xn =10. Estimate the equilibrium
T
m
melting temperature 0 for poly(decamethylene adipate).
Calculate the amount of isopentyl acetate that should be present in the reaction mixture at equilibrium based on 300 mmol of acetic acid and 150 mmol of isopentyl alcohol as starting quantities.
What quantity of energy, in joules, is required to raise the temperature of 454g of tin from room temperature, 25.0 degree C, to its melting point, 231.9 degrees C
Chemical Syntheis can be characterized as consisting of three basic processes: making chemicals, isolating the products and characterization. Each process is carried out using one or more techniques. Match the following technique with the process.
the equivalence point occurs when 12.75 mL of 0.075M NaOH is added to a solution containing 10mL weak unknown acid and 40mL Deionized water
a gas stream is entering an absorber is 20mol% CO2 and 80 mol% air. the flow rate is 1 m^3/min at 1 bar and 360 K. when the gas stream exits the absorber , 98% of the incoming CO2 has been absorbed into a flowing liquid amine stream
Explain what weight of bezene is required to prepare 100 g of phenol (C6H5OH) according to the following series of reactions? Since these reactions don't yield 100%, the yield of each product is indicated.
The final temperature of the water is 27.8°C. Calculate the mass of water in the calorimeter. The correct answer should be 6.2x10g
Problem- The Kb for an amine is 7.280x10^-5. What percentage of the amine are protons red if the pH of a solution of the amine is 9.408? Assume that all OH- came from the reaction of B with H2O
Which of the following is a neutralization reaction?
A hard water sample contains 0.0085% Ca by mass (in the form of Ca2+ ions). What mass of water contains 1.2 g of Ca
Calculate the molar solubility of thallium chloride in 0.20M NaCl at 25 degrees Celcius. Ksp for TICl is 1.7 x 10 -4. What volume of 0.500 M HNO3 is needed to titrate 60.00 mL of 0.500 M Ca(OH)2 to the equivalence point?
it is given that the mobility of free electrons and holes in pure germanium are 0.38 and 0.18 m2v-s. find the intrinsic
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