Finding the initial concentration
A zero-order reaction has a constant rate of 2.50×10-4 . If after 35.0 seconds the concentration has dropped to 1.00×10-2 , what was the initial concentration?
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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?
The bridge cable is stiffened by a three hinged stiffening girder which carries two concentrated loads of 30 kN each at points 20 m from both the ends.
Calcium chloride is used to melt ice and snow on roads and sidewalks and to remove water from organic liquids. Calculate the molarity of a solution prepared by diluting 165 mL of 0.688 M calcium chloride to 925.0 mL.
Calculate the largest tolerable internal crack length for a 7075-T651 aluminum alloy component that is loaded to a stress one-half of its yield strength without catastrophic fracture.
A sample of pure NO2 is heated to 336 degree Celsius at which temperature it partially dissociates according to the reversible equation.
Calculate the molar mass of a nonelectrolyte that lowers the freezing point of 25.00 g of water to -3.9 degrees Celsius when 4.27 g of the substance is dissolved in the water.
Calculate the wavelength of the electromagnetic radiation required to excite an electron from the ground state to the level with n = 5 in a one-dimensional box 39.8 pm in length.
Radioactive wastes are stored in a spherical type 316 stainless steel tank (kss = 13 W/mK) of inner diameter 1 m and 1 cm wall thickness. Heat is generated in the wastes at a rate of 3 × 104 W/m3.
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