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What is the heat of sublimation (kcal/mol) of diatomic Iodine at 298.15 K? (the heat of formation of iodine gas is 62.25 kJ/mol)
A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of = 0.500 (where a femtogram,fg , is 10^-15 g) and is swimming at a velocity of v = 9.00 um/s, with an uncertainty in the velocity of 8.00 %
The Goodyear blimps, which frequently fly over sporting events, hold approximately 1.60×105 ft^3 of helium. If the gas is at 25deg C and 1.0 atm, what mass of helium is in the blimp
How many mL of medicine X would you need to give a 100 g dose?
what is the [OH-] concentration of a solution that is 0.225 M in Na2CrO4(i.e., the sodium salt of chromic acid)
What quantity of energy as heat is required to vaporize a 60 mL of mercury at 357 C, its normal boiling point? The density of mercury is 13.6 g/mL and Atomic Mass is 200.59 g/mol.
At a pressure of 1.00 atm and a temperature of 20 degree Celsius, 1.72 g CO2 will dissolve in 1 L of water. How much CO2 will dissolve if the pressure is raised to 1.35 atm and the temperature stays the same?
in a coffee-cup calorimeter 1.20 g of nh4no3 is mixed with 79.0 g of water at an initial temperature of 25.00degc.
A disulfide bridge forms between two cysteine residues. d. Disulfide bridges can exist between two amino acid residues on the same chain. e. Disulfide bridges are formed by an irreversible oxidation reaction.
A solution is made by combining 15.0 mL of 18.0M acetic acid with 5.50g of sodium acetate and diluting to a total volume of 1.50 L. Calculate the pH of the solution.
Rhodium has a density of 12.41 g/cm3 and crystallizes in a face-centered cubic lattice. Calculate the radius of a rhodium atom?
when .65 moles of iron metal react with 40.0 mL of a 2.5 M copper (II)chloride solution to produce copper metal and iron (III) chloride. How many moles of copper will be produced?
What is the ration of the concentrations of H2PO4- and HPO42- at (a) pH 7.0; (b) pH 7.5; (c) pH 8.0
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