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A 4.000 g sample of aspirin prepared in the laboratory using 5.000 g salicylic acid and 20 mL of acetic anhydride. What is the percent yield of aspirin?
Pure benzene C6H6, freezes at 5.5°C and boils at 80.1°C. What is the boiling point of a solution consisting of cyclohexane (C6H12) dissolved in benzene if the feezing point of this solution
An empty volumetric flask, weighing 27.16 grams, has a volume of 100.4 cm3. How much would it weigh when filled with bromine, an element that has a density of 3.1028 g/cm3?
If chalcone is used to synthesize isoxazole using NH2OH-HCl + EtOH and KOH/H2O, what does the mechanism for that look like?
If 18.5 mL of 0.800 M~rm HCl solution are needed to neutralize 5.00 rm mL of a household ammonia solution, what is the molar concentration of the ammonia?
A 0.0355 g sample of an unknown molecular compound is dissolved in 1.000 g of liquid camphor at 200.0°C. Upon cooling, the camphor freezes at 157.7°C. Calculate the molar mass of
If you had 40 molecules of CO gas in 250000 molecules of air, what is the concentration of CO in parts per million?
Based on this value and the standard enthalpies of formation for the other substances, what is the standard enthalpy of formation of CH3CH2OH(g) ? kJ/mol.
A flask contains 0.320mol of liquid bromine, Br2. Determine the number of bromine molecules present in the flask. Express your answer numerically in molecules.
Combustion analysis of toluene, a common organic solvent, gives 5.89mg of CO2 and 1.37mg of H2O. If the compound contains only carbon and hydrogen, what is its empirical formula?
The difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron.
Aspirin (acetylsalicylic acid) is a weak acid with a pKa of 3.4. Stomach acid has a pH of approximately 1.4. What is the approximate ratio of the protonated form of aspirin to the deprotonated form
Suppose 1.91 g of the vapor of a volatile liquid is able to fill a 408-mL flask at 100.4 degrees Celsius and 765 mmHG. What is the molar mass of the liquid?
Ammonia (NH3) is widely used as a fertilizer and in many household cleaners. How much ammonia is produced when 7.8 mol of hydrogen gas react with an excess of nitrogen gas? Answer in units of mol
Determine which reactant is oxidized, which reactant is reduced, which reactant is the oxidizing agent, and which reactant is the reducing agent.
What is the pH of a solution which is 0.023 M in weak base and 0.035 M in the conjugate weak acid (Ka = 7.1 × 10-6)?
What kind of kinetics does this enzyme follow: rapid equilibrium or just the general steady state? Justify your answer.
The vapor pressure of water is 28.3 torr at 29°C if a reaction at that temperature produces CO2 which is collected over water at a total pressure of 576 torr, what is the partial pressure of oxy
A hypothetical molecule, X-Y, has a dipole moment of 1.64 D and a bond length of 165 pm. Calculate the percent ionic character of this molecule.
A sample of gas weighs 0.250 g and occupies a volume of 112 cm3 at STP. what is the molecular weight of this gas ?
A multiple stage evaporator concentrates a weak solution of lithium hydroxide from 4.48 wt% to 26.78wt%. This evaporator processes 10 metric tonnes of solution each day. Determine:
Consider the base monosodium phosphate, Na (HO)2P( O)O . (a) Write the structure of the conjugate acid of this base. (b) Given that the pKa of this conjugate acid is 2.1, explain why an aqueous solu
An equilibrium mixture of this reaction at a certain temperature was found to have [NH3]= 0.276M and [H2S]= 0.350M .What is the value of the equilibrium constant (Kc) at this temperature?
The goose has a mass of 16.8lb (pounds) and is flying at 10.3miles/h (miles per hour). What is the kinetic energy of the goose in joules?
According to the following reaction, how many moles of carbon dioxide will be formed upon the complete reaction of 29.1 grams of carbon monoxide with excess water?