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Caffeine has a distribution of 4.6 between water and dichloromethane. Calculate how much caffeine (I used 0.5283g of caffeine) is extracted per each 6ml dichloromethane extraction.
For a given sample of {rm CH_3OH}, the enthalpy change on reaction is 19.0 kJ. How many grams of hydrogen gas are produced?
Write the half reactions and the overall cell reaction for each of the following voltaic cells: a)Al(s)/Al^3+(aq)//Cd^2+(aq)/Cd(s) b)Sn(s)/Sn^2+(aq)//Fe^3+(aq),Fe^2+(aq)/C (graphite)
Calculate the change in pH when 6.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq).
A mixture formed by adding 40.0 mL of 2.5×10-2 M HCl to 120 mL of 1.0×10-2 M HI. What is the pH of the strong acid solution?
what amount of heat is produced? The specific heat of aluminum is 0.90J/g C?
A chemical process is used to convet toulene (MW=92) and hydrogen to benzene (MW=78) and methane (CH4) by the reaction : Toulene+H2->Benzene+CH4
What wieght of glycine (pka1=2.4, pka2=9.6) and what volume of 0.5 N(normality) HCl would be necessary to make 100 mL of 0.2 M buffer pH 2.4?
determine the specific heat capacity of a metal that has a mas of 14 grams. As the metal cools from 400 degrees celcius to 200 degrees celcius, 364 joules of heat is released
Explain what a hydrogen bond is and describe, on the molecular level, how a water and an alcohol molecule can hydrogen bond
A saturated solution of this substance was made in 0.01 M KlO3. The copper concentration was found to be 0.0012M. Determine the [IO3^-] and the Ksp of the substance.
a. added half the amount of benzaldehyde? b. forgot to add benzaldehyde? c. forgot to add acetone, but added a high (50%) concentration of sodium hydroxide? d. washed the product with large amounts of hot ethanol?
A silver block, initially at 56.8 degrees C, is submerged into 100.0g of water at 24.7 degree C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 27.8 degrees C
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