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A sample of Tl-201 has an initial decay rate of 5.84×104 /s. How long will it take for the decay rate to fall to 319 /s ? ( Tl-201 has a half-life of 3.042 days.)
The density of water vapor at 327.6atm and 776.4K is 133.2gm/dm^3. determine the molar volume Vm of water and the compression factor Z from these data
Mg + 2HCl --> MgCl2 + H2 For a mass of 0.013 g Mg and 5.0 mL of 1.00 M HCl, in a flask with V = 140.612 mL at 23.5?C. Calculate the vapor pressure of H2 and vapor pressure of water.
Liquid nitrogen has a density of 0.808g/ml at 77 K. A sample of 2.5 L of liquid nitrogen is allowed to evaporate at 21°C and 1.00 atm of pressure. what volume will the nitrogen gas occupy?(keep your phases straight)
Kb of ethylamine, urea and ammonia are 5.6 x 10-4, 1.5 x 10-14, 1.8 x 10-5, respectively. Arrange these bases in the increasing order of basicity
an aqueous solution contains the amino acid glycine (NH2CH2COOH). Assuming that the acid does not ionize in water, calculate the molarity of the solution if it freezes at -2.7 Degree celsius
An open flask sitting in a lab fridge looks empty, but we know that actually it is filled with a mixture of gases called air. If the flask volume is 4.00 L, and the air is at standard temperature and pressure,
Consider the cell described below. Al | Al3+ (1.00 M) || Pb2+ (1.00 M) | Pb Calculate the cell potential after the reaction has operated long enough for the [Al3+] to have changed by 0.32 mol/L. (Assume T = 25°C.)
A 13 gram sample of calcium reacts with bromine to form 24 grams of calcium bromide. How many grams of bromine are used in the reaction?
Equal volumes of 1 x 10-4 M solutions of Cd2+ and CO32- ions are mixed in one flask and equal volumes of 1 x 10-4 M solutions of Ag+ and CrO42- ions are mixed in a second. Which substances precipitate given that the Ksp values of CdCO3 and Ag2CrO4..
Explain how does unique physical and chemical properties of water contribute to significance of water for life on Earth to survive.
Determine which monomer will have the higher degree of polymerization (DP) and by how much?
How many photons strike the CD surface during the playing of a CD 69 minutes in length?
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