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The half-life of U-235, an alpha emitter, is 7.1*10^8 yr.Calculate the number of alpha particles emitted by 9.1 mg of this nuclide in 8.0 minutes.
If a tube contains 4.0 oz of sunscreen, how many kilograms of benzyle salicylate are needed to manufacture 325 tubes of sunscreen?
Which of the following is a homogeneous mixture? Which of the following represents a chemical change, rather than a physical change? Which of the following pairs of symbol & element is incorrect?
A particular calorimeter is calibrated and is found to have a calorimeter constant, Ccal = 3.640 kJ/°C. When 1.500 g of an unknown hydrocarbon was combusted in the calorimeter
Consider the solubility information BaSO4 = 3.4 ×10 -4 g 100 g H2O at 20 ?C.Calculate the solubility-product constant Ksp
A stream of propane is throttled from 20 bar and 518 K to 0.42 bar. This process is irreversible due to frictional losses at the nozzle.
Calculate G°f (kJ mol -1) for glycerol and G°rxn (kJ mol -1) for the combustion of one mole of glycerol
Describe the procedure for preparation of 250 cublic cm of aqueous sulphamic acid of accurately known concentration.
For the following processes, calculate the change in internal energy of the system and determine whether the process is endothermic or exothermic:
a badly tarnished silver teapot. The tarnish is a result of the silver metal reacting with the oxygen in the air according to
Which of the following is a mechanism by which enzymes assist in formation of a transition state intermediate? a) Preventing interference by water molecules.
What is the half life of a first order reaction if it takes 4.4 x 10-2 seconds for the concentration to decrease from an initial concentration
Aerosol cans carry clear warnings against incineration because of the high pressures that can develop upon heating. Suppose that a can contains a residual amount of gas at a pressure of 765mmHg and a temperature of 20?C.
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