You decide it is time to clean your pool since summer is quickly approaching. Your pool maintenance guide specifies that the chl
orine, Cl2, concentration of the pool should be between 1 and 3 ppm. In order to determine if your pool is safe to swim in, you send a sample of pool water to a chemist for analysis of the Cl2 content. The chemist reports a chlorine concentration of 2.96 × 10–5 M. Convert the concentration of Cl2 to parts-per-million (ppm).
The unit of measurement molarity (M) represents the same magnitud as mole/L (number of moles of the substance in one liter of solution). The concentration in ppm represents the same as mg/L (number of miligrammes of the substance in one liter of solution). In order to convert from M to ppm we have to consider, then, mass and volume. We can see that in both cases the volume is expressed in liters, so we don't have to do anything to change it. The problem comes when you see that you have to convert moles, from the molatiry, to miligrammes, to get the result in mg/L, meaning ppm.
First of all, notice that the substance is Cl2, so we need to find a relationship between the number of moles and its mass. If you look in the periodic table you'll see that the atomic mass for Cl is 35,4 g/mole (grammes of Cl in one mole). So, there is a way to relate the moles to the mass of the substance and it is represented on the equation below:
We want to find the mass (m) and we know the amount of moles of Cl2 in the solution (moles=2,96x10^-5), so, if we use the values known on the equation above we get that:
Remember that these grammes are found in one liter of solution. So, this means we have 1,048x10^-3 g/L. Previously we said that ppm=mg/L, so all that's left to do it to convert grammes to miligrammes:
1 g = 1000 mg
If we multiply both sides by 1,048x10^-3:
1 * 1,048x10^-3 g = 1000 * 1,048x10^-3 mg
1,048x10^-3 g = 1,048 mg
Knowing that this amount of mass was found in one liter, we get that the amount of substance in the solution is:
Knowing that <em>mg/L=ppm</em>, then the concentration of Cl2 in ppm is:
False, lightning is not an <span>example of matter in a liquid state. Rather, it is an example of matter in a state of plasma. </span>It<span> is a form of matter in which many of the electron s wander around freely among the nuclei of the atoms. Hope this answers the question.</span>
The force that opposes the motion of objects that touch as they move past each other is called.....
The force that opposes the movement of an object through water is called drag. This is a type of frictional force. This force normally depends on the density and the viscosity of the fluid in question. The liquid which has more density and more viscosity or stickiness will produce a greater amount of drag force on an object than a fluid that is less dense and less viscous in nature. River water normally has less drag than that of sea water.
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