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The sugar substitute saccharin (C7H5NO3S) is a very weak acid (Ka = 2.1 × 10-12 - think carefully about the magnitude of this number). Calculate the pH in a solution that contains 3.48 g of saccharin per litre. You may not neglect the autohydrolysis of water in this problem. (note the answer should be 6.65)
How many moles of hydrogen gas occupy a volume of 559mL at standard temperature and pressure
Combustion reactions are exothermic. The heat of reaction for the combustion of cyclohexane, C6H12, is 936.8 kcal/mol. What is the heat of combustion for cyclohexane in kcal/gram
Give a brief explanation of the physics behind combustion. What happens on a molecular/chemical scale and approximately how much energy is released per reaction
A solution of a specific vitamin has ?max = 251nm and a concentration of 4.79x10^-7M. The absorbance of the solution at 251 nm is A = 0.175. What is the molar absorptivity of the vitamin at 251nm
The solubility of caffeine in water is 2.2mg/mL at 25 degrees celsius and 670 mg/mL at 100 degrees celsius. How many mL of boiling water would it take to dissolve 23g of caffeine
Problem- A buffer is prepared from 0.1090 M weak acid and 0.2100 M of its conjugate base. The pH at equilibrium is 2.21. What is the Ka for this acid
97.5g sodium chloride were dissolved in distilled water in 500ml volumeristic flask. the mixture was stirred to form a
About how much phenacetin will remain dissolved when the water calculated (94ml) is cooled to room temperature
Explain why replacement of a hydrogen on the oxygen by CH3 generally results in a lower boiling point. What are the major factors responsible for the difference in boiling points of the two ethers.
Which of the following below applies to the addition of nucleophiles toalpha, beta-unsaturated carbonyl compounds
Titration of 664 mg of a pure organic carboxylic acid, H2A, showed a rapid change in pH at 40.00 mL and at 80.00 mL of 0.100 M NaOH titrant. When 40.00 mL of NaOH was added, the pH was 5.85, and at 60.00 mL of NaOH the pH was 8.08. What is the mol..
Consider the molecular orbitals of the P2 molecule. Assume that the MOs of diatomics from the third row of the periodic table are analogous to those from the second row. Which valence atomic orbitals of P are used to construct the MOs of P2?
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