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Molar concentration of mass and volume
Calculator allows to determine the molar concentration of the solution.
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Dilution of solutions
Legend of given volume and calculates the concentrations of the solutions before and after dilution of the volume of solution added is calculated.
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Radioactive decay
The calculator calculates how much radioactive material remains after a certain period of time.
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Calculator allows you to verify the number entered Postnet.
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Verification ISBN preview
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Calculator allows you to verify the ISBN number entered.
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Number of square-triangle (square triangular number)
Number of square-triangle has the properties of a square and a triangular number.
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How far was struck by lightning
Calculator based on the specified time from seeing lightning until you hear thunder in the distance calculated discharge occurred.