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0.016 mol

Q: A 0.500 M solution of iodine-131 whci has a half-life of 8.0 days is prepared After 40 days how much iodine will remain in 1.0 L of solution Express the result in moles?

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You prepare a solution by dissolving a known mass of solute (often a solid) into a specific amount of a solvent. One of the most common ways to express the concentration of the solution is M or molarity, which is moles of solute per liter of solution.

Moles of solute per liter of solution.

100ppb

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its 100 ppm

One linear equation in two variable cannot be solved. It is possible to express either of the two variables in terms of the other but a solution is not possible.One linear equation in two variable cannot be solved. It is possible to express either of the two variables in terms of the other but a solution is not possible.One linear equation in two variable cannot be solved. It is possible to express either of the two variables in terms of the other but a solution is not possible.One linear equation in two variable cannot be solved. It is possible to express either of the two variables in terms of the other but a solution is not possible.

You think probable to a picogram.

- molarity- molality-percentage composition

The domain affects the way we express solutions to problems. A language that closely reflects the problem domain makes it much easier to express the solution.

Per cent by volume means mls of solute per 100 mls solution. So you need to know the volume of the solute and the total volume of the solution. Divide volume of solute by volume of solution and multiply by 100 to get per cent by volume.

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The solution has a total mass of 30 + 250 = 380 g. The mass percent of calcium chloride in this solution is 100(30/380) = 7.9 %, to the justified number of significant digits.