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(a) How many moles of acetic anhydride were represented by the 6.00mL (density=1.08 g/mL) used in the synthesis? (b) How many excess moles of acetic anhydride were used- over and above the amount needed to react with 3.00 g of salicylic acid?
Calculate the frequency (in Hz) of light necessary to move an electron in a He+ ion from the n =2 to n =4 energy level. The Rydberg constant for a helium ion is R = 4.390 x 107 m-1
A concentration of the pollutant NO2 in air of 3.00 ppm (m/v) may be lethal to humans. Will air that contains 1.9 x 10^-3g at NO2 per liter be lethal to humans?
Compound B has molecular formula C6H10O and does not possess any bonds. When treated with concentrated HBr, cis-1,4-dibromocyclohexane is produced. Identify the structure of compound B.
When a 9.92-g sample of gaseous hydrogen bromide dissolves in 45.5 g of water in a coffee-cup calorimeter the temperature rises from 25.00 oC to 69.79 oC. Calculate H in kJ per mol of HBr for the solution process.
Which of the following involve an increase in the entropy of the system under consideration?
Calculate the catalytic efficiency of lysozyme (in units of M-1 s-1), in terms of the rate of encounter of enzyme with substrate. How does this value compare to the diffusion-limited value of k1 = 109 M-1 s-1?
What volume of ethanol must be diluted with water to prepare 308 mL of 0.700 M solution?The density of ethanol is given as 0.789 g/mL.
Compute the number of electrons in a flake of pure gold valued at $0.5. Assume that the price of gold is $1426.0/troy oz.
how many moles of NH4Cl are necessary to prevent the precipitation of magnesium hydroxide (neglect change in volume due to addition of NH4Cl)? The solubility product for Mg(OH)2 is 1.5× 10-11, and the Kb for ammonia is 1.8 × 10-5.
solution has a transmittance of 0.309 in a 1.00 cm cell at 520 nm. Calculate the molar absorptivity of the solution.
Draw the structure of a DNA nucleotide represented by the abbreviation "C." Do not include formal charges on the phosphate group.
Which metal would provide the worst protection for an iron pipe buried in the ground if attached to an iron pipe, Ag, Cu, Zn, Mg
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