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A 0.1019g portion of an aspirin tablet was dissolved in sufficient water to prepare 1.000L of solution. A pipet was used to transfer 10 mL of the solution to a 100 mL volumetric flask. A 2 mL portion of 4 M NaOH (aq) was added to the flask, and the resulting solution was diluted to the mark with water. The fluorescence of the diluted sample solution was found, by the working curve method, to correspond to a salicylate ion concentration of 4.80 x 10^-5 M. Calculate the % acetylsalicylic acid in the aspirin tablet.
If 5.25mL of 0.1000 M NaOH solution is needed to just neutralize excess acid after 20.00 mL of HCl was added to 1.00 g of an antacid, how many moles of acid can the antacid counteract per gram?
A 68-g ice cube at 0°C is placed in 680 g of water at 22°C. What is the final temperature of the mixture?
A close chemical relative of the banned insecticide DDT is methoxychlor (C16H15Cl3O2). Methoxychlor is currently used as a home insecticide. Calculate the mass percent of oxygen in methoxychlor.
You are given some reactions as a. Cl2(aq) + 2NaI(aq)= I2(aq) + 2 NaCl(aq), b. Br2(l) + 2K(S)=2KBr(s), c. Pbs( s) + 4H2O2(aq)= PbSO4(s) + 4H2O(l) you just need to Indicate which element is reduced and which is oxidized in the given equations?
Calculate the enthalpy change in kJ when 21.6g of H2S is burned. 2H2S(g) + 3O2(g) --> 2SO2(g) + 2H20(g) Change in H=-1036kJ/mol
A student mixes 347 mL of water and 254 mL of 8.70 x 10-5 M greenfood dye solution. What is the concentration of this new dilute solution of green food dye?
It takes 54.0 J to raise the temperature of an 8.00 g piece of unknown metal from 13.0rm ^circ C to 24.5^circ{C}. What is the specific heat for the metal?
When heated, all metallic hypochlorites decompose and produce oxygen. Considering this, what happens when the decomposition reaction occurs at an incident involving fire? Please reference your answer and tell me why.
the product for the following reaction between THF and excess HI, and provided a detailed step-bystep mechanism for its formation, using the curved arrow formalism
You have 250.0 ml of 4.00 M sugar solution. You add 217.3 ml of water to this solution. Determine the concentration of the sugar solution after the water has been added
How much heat (in kJ) is evolved in converting 1.00mol of steam at 130.0C to ice at -50.0C? The heat capacity of steam is 2.01 and of ice is 2.09 .
The density of helium gas at 273K and 1.00 atm is 1.76E-4 g/mL. What is the volume (in L) of a balloon containing 9.24 g of helium under the same conditions?
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