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A 32.5-g cube of aluminum initially at 45.8 degree C is submerged in 105.3-g of water at 15.4 degree C. What is the final temperature of both substances at thermal equilibrium? (Assume that the aluminum and the water are thermally isolated from everything else.)
Calculate the pH during the titration of 10.00 mL of 0.400 M hypochlorous acid with 0.500 M NaOH. First what is the initial pH (before any NaOH is added)? The initial ph is 3.96. 1. What is the pH after 2.60 mL of NaOH are added? 2. What is the pH..
Water is even added to the wall of the Erlenmeyer flask during the titration. Explain why water added to the KHC8H4O4 has no effect on the data , whereas water added to the NaOH solution may drastically affect the data.
Problem- A liter of a solution saturated at 25 degrees celsius with calcium oxalate, CaC2O4, is evaporated to dryness, giving a 0.0061 gm residue of CaC2O4. Calculate the concentrations of the ions, the molar solubility, and the solubility product..
When a certain liquid of molar mass 46.1 g/mol freezes at -3.65 degrees celsius its density changes from 0.789 g/cm^3 to 0.801 g/cm^3. Its enthalpy of fusion is 8.68 kJ/mol. Estimate the freezing point of the liquid at 100 MPa
Calculate the amount (mL) needed of a 4.0 M phenylmagnesium chloride in THF solution to give 1.5 equivalents based on the amount of starting material used. Starting material needed: 0.58 mmol? mL of 4.0 M phenylmagnesium chloride in THF
Choose the scientist: write X for Democritus, D for Dalton, T for Thomson, R for Rutherford or B for Bohr - element were identical to all other atoms of the same element this was not correct.
Calculate ΔHrxn for the following reaction: Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g). Use the following reactions and given ΔH′s. 2Fe(s)+3/2O2(g)→Fe2O3(s), ΔH = -824.2 kJ. CO(g)+1/2O2(g)→CO2(g), ΔH = -282.7 kJ.
Calculate the effective radiation dosage (in Sieverts) for a 85-kg person who is exposed to 7.3 × 109 particles of alpha radiation. Assume that 85% of the radiation is absorbed
Problem- Balance the following half reactions by adding the appropriate number of electrons. Which are oxidation half- reactions and which are reduction half-reactions. If you could show all steps it would be appreciated
emitted into the atmosphere. The half-life of krypton-85 is 10.76 years. What fraction remains after 25 years?
would a given amount of flourine react with different masses of the two hydrogen isotopes? Does this violate the law of definite proportions.
You have 250.0 mL of a 0.56M solution of sodium acetate. How many mL of 0.50M acetic acid should be added to make a buffer of pH 4.40.
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