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a 0.331-g sample of aspirin prepared in the lab was dissolved in 95% ethanol and titrated to a phenophthalein endpoint with 16.7 ml of 0.107M NaOH Calculate moles of scetylsalicylic acid present in the aspirin sample ;What mass (g) of scetylsalicylic acis is present in the sample? Calculate the percent purity of the aspirin sample
how many grams of KO2 are needed to produce 885.0 L of O2 at 22.0 degrees Celsius and 1.00 atm
A current of 3.15 A is passed through a Pb(NO3)2 solution for 1.40 hours. How much lead is plated out of the solution.
Describe the preparation of 1.5 liters of a 0.1 M acetate buffer, pH 5.0, starting from solid sodium acetate trihydrate
The molar heat capacity of silver is 25.35 J/mol * C. How much energy would it take to raise the temperature of 8.60 g of silver by 11.1 C?
Three gases (8.00 rm g of methane, CH_4, 18.0 g of ethane, C_2H_6, and an unknown amount of propane, C_3H_8) were added to the same 10.0 L container.
175g of water was heated from 15 degrees to 88 degress celsuis. how many kilocalories were absorbed by the water?
process it is given that Rubidium has a heat of vaporization =69.0 kJ/mol at its boiling pt= (686°C). Compute ΔS for this process?
a 75.0 ml sample of .0500M HCN is titrated with .500 M NaOH. what is the concentration of H+ in the solution after 3.0 ml of .500 M NaOH has been added
Major Organic Product Formed of Acetyl Chloride Reacting with Reagents, What major organic product would you expect to be formed when acetyl chloride reacts with each of the following reagents?
at 400 K, the rate of decomposition of a gaseous compound initially at a pressure of 12.6 kPa, was 9.71 Pa/s when 10.0 % had reacted and 7.67 Pa when 20.0 % had reacted.Determine the order of reaction.
Aspirin (C9H8O4) is produced through the following reaction of salicylic acid (C7H6O3) and acetic anhydride (C4H6O3). C7H6O3(s) + C4H6O3-> C9H8O4(s) + HC2H3O2
Calculate the number of mmoles of primary standard grade Na2CO3. b. How many mmoles of HCl reacted with the Na2CO3? c. Calculate the molarity of the HCl solution.
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