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The bitter-tasting compound quinine is a component of tonic water and is used as a protection against malaria. It contains only C, H, N and O. When a sample of mass 0.487 g was burned, 1.321 g of carbon dioxide, 0.325 g of water, and 0.0421 g of nitrogen were produced. The molar mass of quinine is 324 g/mol. Determine the molecular formulas of quinine. (Type your answer using the format CO2 for CO2 and use the order CHNO)
In 1773 Ben Franklin poured a teaspoon of oil onto a pond. He observed that it spread out to form a film that covered an area of about 22,000 ft2. If a teaspoon has a volume of about 5 cm3 and if the film was roughly one molecule thick, then what ..
A 5.00g sample of water vapor, initially at 155C is cooled at atmospheric pressure, producing ice at -55C. Calculate the amount of heat energy lost by the water sample in this process, in kJ.
Calculate the pH of a buffer that is 0.058 M HF and 0.058 M LiF. The Ka for HF is 3.5 x 10^-4. Calculate the pH of a buffer that is 0.158 M HClO and 0.099 M NaClO. The Ka for HClO is 2.9 x 10^-8.
What Material would be produces in the electrolysis of the following reagent
compute the molecular formula of ch3cooh the percent composition of acetic acid is 39.99 c and 6.73 h. the remainder of
a sample of mgcl2 is known to be contaminated with nacl. a 3.47-g portion of the sample is dissolved in water and
calculate the total volume of hydrogen gas which would be collected at 760 mm Hg and 25 degrees celsius. Will a second gas be present in the sample collected by water displacement
What is the time required to reduce the concentration of lactose in 2 L of milk from an initial value of 2.50 mg/mL to a final value of 1.5 mg/mL.
the half-life for the reaction at 550c is 81.3 seconds. how long does it take for 89 of phosphine sample to
What would be the best indicator for the titration of 0.20 M CH3COOH titrated with 0.2 M NaOH? (Ka for acetic acid = 1.8 X 10-5) The pH ranges for the color change of some common acid base indicators are given below
Consider the titration of a 25.0 -mL sample of 0.105 M HC2H3O2 with 0.125 M NaOH. Determine the pH at 6.00mL of added base, the pH at the equivalence point.
Lactic acid (C3H6O3) which occurs in sour milk and foods such as sauerkraut, is a weak monoprotic acid.? The pH = 0.10 M solution of lactic acid is 2.43 What are the values of Ka and pKa for lactic acid
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