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In coffee, how much would the boiling point (in C) of the water be raised by the addition of 0.2 g of caffeine (C8H10N4O2) to 5.0 L of water in making this so much coffee? Ignore the other ingredients (except water and caffeine) & assume the final amount is 10.0 L (Kb for water is 0.512 K kg mol-1)
a. 0.0001b. 0.05c. 10 mind. 5 mine. 1.5 min
At what temperature does benzene boil when the external pressure is 480 ?
In which reaction does the oxidation number of hydrogen change?
how would you prepare 100ml of 0.5M NaOH? Calculate the mass of NaOH needed, and describe the procedure and glassware you would use.
A mixed alkali sample requiring 15.0ml of 0.100 F HCl to reach the first end point and an additional 20.0ml to reach the second end point
Consider the following mechanism for the oxidation of bromide ions by hydrogen peroxide in aqueous acid solution
Write out the reaction mechanism for conversion of acetylferrocene to diacetylferrocene using acetic anhydride and 85% phosphoric acid.
Choose the element with more negative (more exothermic) electron affinity from each of the following pairs.
A 20.94 g sample of an unknown metal is heated to 99.4 C in a hot water bath. The metal is quickly transferred to 100ml of water at 22.0 C in a coffee cup calorimeter.
From the following chemical reactions determine the relative Bronsted-Lowry acid strengths (strongest to weakest). HCLO4 (aq) + H2O (l) ----> H3O (aq) + ClO4- (aq)
The standard enthalpy of formation of n-octane is -249.95 kJ/mol. Compute the amount of heat liberated when 3.58 g of n-octane is burned completely with excess oxygen to form carbon dioxide and liquid water.
How much energy is required to evaporate 100.0 grams of water that is at 100.0 degrees Celsius?
An organic material is extracted from water. The separatory funnel containins 10 mL of ether and 20 mL of water. Considering that the K (partition coefficient) value is 3.2,
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