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A calorimeter, fabricated from 135.0 g of iron metal, thermallyinsulated from its surroundings, contains 173.0 g of water. Both the calorimeter and the water are at an initial temperature of21.25°C. A 64.0-g sample of an unidentified substance is heatedto 98.0°C and then placed into the water inside thecalorimeter. After a short time the temperature of the calorimeterand its contents equilibrate at 25.30°C.
The work function for Cu metal is 4.80 eV. If a piece of Cu is bombarded by violet light (λ = 4,000 Å), will electrons be ejected? "YES" or "NO" with supporting argument/calculation.
The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood.
At 700 K the equilibrium constant for the reaction is Kp = 0.76. CCl4(g)-> C(s) + 2 Cl2(g) A flask is charged with 2.00 atm of CCl4, which then reaches equilibrium at 700 K. (a) What fraction of the CCl4 is converted into C and Cl2?
The standard free energy of activation of a reaction A is 88.3 kJ mol-1 (21.1 kcal mol-1) at 298 K. Reaction B is one hundred million times faster than reaction A at the same temperature.
A buffer solution is prepared by dissolving 1.50g each of benzioc acid C6H5CO2H and sodium benzoate NaC6H5CO2 in 150.0mL of solution.
What mass of CaCl2 , when dissolved in 100.00 g of water, gives an expected freezing point of 5.0°C; CaCl2 is ionic? What mass of glucose would give the same result?
A blank titration of 10mL of similar solution containing no oxalic acid required 0.04mL to exhibit dectectable color. Find the concentration of oxalic acid in the unknown
consider the chemical species if5 if4.a. draw the lewis structure and make a rough three-dimensional sketch of each
As a part of this exercise, you will need to prepare 100 mL of a 0.1 M phosphate buffer at pH 7.5, and you need to calculate the amounts of NaH2PO4 and K2HPO4 that you need to use in your buffer.
devise a reaction scheme to make ethanol from propanoic acid. several steps may be required. for each reaction include
A solution made from 6.50 g of an unkown compound in 27.8 g of diphenyl has a molality of 0.195 m. Calculate the molar mass of the unknown
which is the lowest at 25 C a) deltaG f for H2O(s) b) deltaG f for H2O(l) c) deltaG f for H2O(g) d) 1/2 deltaG f for O2(g) plus deltaG f for H2O(g)
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